Co-reporter:Heping Ma; Bailing Liu; Bin Li; Liming Zhang; Yang-Guang Li; Hua-Qiao Tan; Hong-Ying Zang;Guangshan Zhu
Journal of the American Chemical Society 2016 Volume 138(Issue 18) pp:5897-5903
Publication Date(Web):April 19, 2016
DOI:10.1021/jacs.5b13490
Mimicking proton conduction mechanism of Nafion to construct novel proton-conducting materials with low cost and high proton conductivity is of wide interest. Herein, we have designed and synthesized a cationic covalent organic framework with high thermal and chemical stability by combining a cationic monomer, ethidium bromide (EB) (3,8-diamino-5-ethyl-6-phenylphenanthridinium bromide), with 1,3,5-triformylphloroglucinol (TFP) in Schiff base reactions. This is the first time that the stable cationic crystalline frameworks allowed for the fabrication of a series of charged COFs (EB-COF:X, X = F, Cl, Br, I) through ion exchange processes. Exchange of the extra framework ions can finely modulate the COFs’ porosity and pore sizes at nanoscale. More importantly, by introducing PW12O403– into this porous cationic framework, we can greatly enhance the proton conductivity of ionic COF-based material. To the best of our knowledge, EB-COF:PW12 shows the best proton conductivity at room temperature among ever reported porous organic materials.
Co-reporter:Xindan Zhang, Bin Li, Mingming Jiang, Liming Zhang and Heping Ma
RSC Advances 2016 vol. 6(Issue 43) pp:36528-36533
Publication Date(Web):04 Apr 2016
DOI:10.1039/C5RA27881C
To increase emission of up-converting materials, NaGdF4:20%Yb3+/2%Er3+@NaGdF4@Ag up-converting nanoparticles (UCNPs) in core–spacer–shell structure have been designed and fabricated. Significant emission enhancement compared with ordinary NaGdF4:20%Yb3+/2%Er3+ has been obtained. Furthermore, the enhancement mechanism have been found as the protective effect of NaGdF4 and localized surface plasmon resonance (LSPR) of Ag.
Co-reporter:Heping Ma, Bin Li, Liming Zhang, Dong Han and Guangshan Zhu
Journal of Materials Chemistry A 2015 vol. 3(Issue 38) pp:19346-19352
Publication Date(Web):17 Aug 2015
DOI:10.1039/C5TA05447H
A series of core–shell porous aromatic frameworks (PAFs) are synthesized for selective detection of nitro-explosives. The conjugated core–shell PAFs possess large surface areas, which can facilitate the pre-concentration of a targeted analyte, leading to superior sensitivity. The tunable LUMO energy levels of these core–shell PAFs make them selectively detect high explosive TNT and TNP from other competing nitro compounds. Moreover, vapor phase detection of nitro aromatics using PPC-PPyS-PAF-2 exhibits a two dimensional fluorescence signal response toward different nitro aromatics. The power to accurately recognize nitro aromatic explosives in the fluorescent 2D map highlights the core–shell PAFs as very promising materials for nitro explosive sensing.
Co-reporter:Jingkai Ni, Chongxin Shan, Bin Li, Liming Zhang, Heping Ma, Yongshi Luo and Hang Song
Chemical Communications 2015 vol. 51(Issue 74) pp:14054-14056
Publication Date(Web):28 Jul 2015
DOI:10.1039/C5CC04750A
A novel rhodamine-oxaldehyde (RHO) functionalized β-NaYF4:Yb3+/Er3+ upconversion nanoparticle (UCNP) for specific detection of cysteine (Cys) in aqueous solution was achieved through a Förster resonance energy transfer (FRET) process. Based on self-assembling interaction, hydrophobic upconversion nanoparticles could be modified with α-cyclodextrin to make them water dispersible.
Co-reporter:Xing Wang, Hongfei Li, Zisheng Su, Fang Fang, Guang Zhang, Junbo Wang, Bei Chu, Xuan Fang, Zhipeng Wei, Bin Li, Wenlian Li
Organic Electronics 2014 Volume 15(Issue 10) pp:2367-2371
Publication Date(Web):October 2014
DOI:10.1016/j.orgel.2014.07.008
•Small molecule near-infrared photodetectors (NIR-PDs) based on a PbPc/C60 planar heterojunction are demonstrated.•The NIR-PDs show a broad-band response that extends to 1100 nm.•The optimized NIR-PD exhibits an EQE of 19.7% at 900 nm and a detectivity of 2.34 × 1011 Jones at zero bias.•The performance is higher than other small molecule NIR-PDs reported.High efficiency organic small molecule near-infrared photodetectors (NIR-PDs) based on a lead phthalocyanine/C60 planar heterojunction are demonstrated. The NIR-PDs show a broad-band response that extends to 1100 nm. The performance of the NIR-PDs is improved by using CuI as anode buffer layer. The optimized NIR-PD exhibits a response peak at about 900 nm with external quantum efficiencies (EQEs) of 19.7% at zero bias and 35.1% at −6 V, which are higher than other small molecule NIR-PDs reported. Comparable EQEs of 18.0% at zero bias and 33.2% at −6 V are found in the NIR-PD by further using 4,7-diphenyl-1,10-phenanthroline as cathode buffer layer. Meanwhile, the dark current is significantly reduced, which results in a high detectivity of 2.34 × 1011 Jones at zero bias, which is among the highest detectivities reported for organic small-molecule NIR-PDs. Besides, the NIR-PDs show a reliable stability in ambient condition.Graphical abstract
Co-reporter:Yang Yang, Lei Zhang, Bin Li, Liming Zhang and Xingyuan Liu
RSC Advances 2013 vol. 3(Issue 35) pp:14993-14996
Publication Date(Web):08 Jul 2013
DOI:10.1039/C3RA42276C
A series of tetramethyl BODIPY branched triphenylamine derivatives TPA–BDP1, TPA–BDP2 and TPA–BDP3 have been designed and synthesized. Their emissions are tunable from green to red by changing solvent polarity and exhibit highly efficient and stable amplified spontaneous emissions (ASE) in the green region, under transversal pumping at 355 nm.
Co-reporter:Yanhong Liu, Bin Li, Yan Cong, Liming Zhang, Di Fan, Linfang Shi
Journal of Luminescence 2011 Volume 131(Issue 4) pp:781-785
Publication Date(Web):April 2011
DOI:10.1016/j.jlumin.2010.12.003
A new dirhenium(I) complex fac-[{Re(CO)3(4,7-dinonadecyl-1,10-phenanthro -line)}2 (4,4′-bipyridyl)] (trifluoromethanesulfonate)2 (denoted as D-Re(I) ) is assembled in MCM-41 and SBA-15 type mesoporous silica support. The emission peaks of D-Re(I) in D-Re(I)/MCM-41 and D-Re(I)/SBA-15 are observed at 522 and 517 nm, respectively. Their long excited lifetimes, which are of the order of microseconds, indicate the presence of phosphorescence emission arising from the metal to ligand charge-transfer (MLCT) transition. The luminescence intensities of D-Re(I)/MCM-41 and D-Re(I)/SBA-15 decrease remarkably with increase in the oxygen concentration, meaning that they can be used as optical oxygen sensing materials based on luminescence quenching. The ratios I0/I100 of D-Re(I)/MCM-41 and D-Re(I)/SBA-15 are estimated to be 5.6 and 20.1, respectively. The obtained Stern–Volmer oxygen quenching plots of the mesoporous sensing materials could be fitted well to the two-site Demas model and Lehrer model.Research highlights► Dirhenium(I) complex assembled in mesoporous molecular sieves for oxygen sensor design. ► Large α-diimine ligand L used to improve oxygen sensing properties. ► High sensitivity (I0/I100) up to 20.1.
Co-reporter:Xiudong Wu, Luting Song, Bin Li, Yanhong Liu
Journal of Luminescence 2010 Volume 130(Issue 3) pp:374-379
Publication Date(Web):March 2010
DOI:10.1016/j.jlumin.2009.09.023
Novel oxygen sensing materials consisting of [Ru(Bphen)2bpy]2+ (Bphen=4,7-diphenyl-1,10-phenanthroline, bpy=2,2′-bipyridyl) portion covalently grafted to the backbones of the ordered functionalized mesoporous MCM-41 are synthesized by co-condensation of tetraethoxysilane (TEOS) and the functionalized Ru(II) complex [Ru(Bphen)2Bpy-Si]2+ using surfactant cetyltrimethylammoniumbromide (CTAB) as template. The Bpy-Si was used as not only one of the precursors of the sol–gel process but also the second ligand of Ru(Bphen)2Cl2·2H2O complex to prepare the functionalized mesoporous materials for oxygen sensors. Dye leaching shortcoming is overcome due to the Si–C bonds. The derivative mesoporous oxygen sensing materials are characterized by Fourier transform infrared (FT-IR), small angle X-ray diffraction (SAXRD), luminescence intensity quenching Stern–Volmer plots, and excited-state decay analysis. The mesoporous materials show higher sensitivity to the O2 concentration in N2 (I0/I100=23.2) and shorter response time (1.2 s) in comparison with those based on sol–gel method. When the concentration of oxygen is 10%, the luminescence intensity of the oxygen sensor can be quenched by 89.9%, suggesting that it is highly sensing at low concentration of oxygen.
Co-reporter:Yinghui Wang, Bin Li, Liming Zhang, Lina Liu, Qinghui Zuo and Peng Li
New Journal of Chemistry 2010 vol. 34(Issue 9) pp:1946-1953
Publication Date(Web):18 May 2010
DOI:10.1039/C0NJ00039F
A novel fluorescent chemosensing hybrid material (Py-SBA-15) for detecting Hg2+ ions in water was prepared through the functionalization of mesoporous silica (SBA-15) with a modified fluorescent chromophore, 1-(4′-hydroxyphenyl)-4-pyrenyl-2,3-diaza-1,3-butadiene (Py-OH). Py-OH covalently grafted to the coupling agent 3-(triethoxysilyl)propylisocyanate (TESPIC) was used as the precursor for the preparation of mesoporous hybrid material. The XRD data and TEM images of Py-SBA-15 confirm that the hexagonal ordered mesoporous structure is preserved after functionalization. Py-SBA-15 demonstrates a high selectivity for Hg2+ ions in the presence of other metal ions, which results from a dramatic fluorescence enhancement by the addition of Hg2+ ions upon the suspensions of Py-SBA-15. A good linearity (R2 = 0.9989) between the fluorescence intensity of Py-SBA-15 and the concentration of Hg2+ ions is constructed, and a satisfactory detection limit of 1.7 × 10−7 g mL−1 is obtained. More importantly, Py-SBA-15 shows good regenerative ability due to the greatly minimized leaching effect of the sensing molecules by covalent grafting strategy. These results presented in this paper indicate that this hybrid material could be a promising fluorescence chemosensor for detecting Hg2+ ions.
Co-reporter:Lina Liu, Bin Li, Ruifei Qin, Haifeng Zhao, Xinguang Ren, Zhongmin Su
Solid State Sciences 2010 Volume 12(Issue 3) pp:345-349
Publication Date(Web):March 2010
DOI:10.1016/j.solidstatesciences.2009.11.011
Novel upconversion nanocomposites with nanoporous structure were presented in this paper. Silica-coated cubic NaYF4:Yb3+, Tm3+ nanoparticles were first prepared. After annealing, monodisperse cubic/hexagonal mixed phases NaYF4:Yb3+, Tm3+@SiO2 nanoparticles were obtained, and the NaYF4:Yb3+, Tm3+ cores became nanoporous. To the best of our knowledge, the nanoporous structure in NaYF4:Yb3+, Tm3+@SiO2 nanocomposites was observed for the first time. They demonstrate increased upconversion emission compared with unannealed dense NaYF4:Yb3+, Tm3+ nanoparticles due to the appearance of the hexagonal NaYF4:Yb3+, Tm3+. The silica shell not only makes the nanocomposites possess bio-affinity but also protects the NaYF4:Yb3+, Tm3+ cores from aggregating and growing up. Thus the upconversion, nanoporous and bio-affinity properties were combined into one single nanoparticle. The nanocomposites have been characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), small angle X-ray diffraction (SAXRD) and emission spectroscopy. These multifunctional nanocomposites are expected to find applications in biological fields, such as biolabels, drug storage and delivery.
Co-reporter:Zhenjun Si, Jiang Li, Bin Li, Shiyong Liu, Wenlian Li
Journal of Luminescence 2009 Volume 129(Issue 3) pp:181-186
Publication Date(Web):March 2009
DOI:10.1016/j.jlumin.2008.09.014
Three novel Cu(I) complexes, [CuDPEphos(NN)]BF4, where NN=1-(4-5′-phenyl-1,3,4-oxadiazolylbenzyl)-2-pyridinylbenzoimidazole (OXD–Pybm; L1) (1), 1-(4-carbazolylbutyl)-2-pyridinylbenzimidazole (Carl–Pybm; L2) (2), and 1-H-2-pyridinylbenzimidazole (HPybm; L3) (3), were synthesized. The photoluminescent (PL) properties of 1–3 and the electroluminescent (EL) properties of complexes 1 and 2 were systematically studied. The maximum brightness of 2-based devices was 8669 cd/m2, which should be the best among the reported Cu(I) complexes-based devices.
Co-reporter:Liying Zhang, Bin Li, Linfang Shi, Wenlian Li
Optical Materials 2009 Volume 31(Issue 6) pp:905-911
Publication Date(Web):April 2009
DOI:10.1016/j.optmat.2008.10.037
The synthesis, structures and photophysical properties of three new luminescent cyclometalated iridium(ΙΙΙ) complexes are reported. The cyclometalated ligand used here is 2-(2-fluorophenyl)-benzothiazole (F-BT). The auxiliary ligands are acetylacetone (Hacac), 1,1,1-trifluoroacetylacetone (3F-Hacac), 1,1,1,5,5,5-hexafluor-oacetylacetone (6F-Hacac), respectively. The crystal structures of the complexes, (F-BT)2Ir(acac) (1) and (F-BT)2Ir(6F-acac) (3), show that the iridium(ΙΙΙ) ion resides in a distorted octahedral environment. All complexes exhibit bright photoluminescence (PL) at room temperature and 1 has a high solution PL quantum efficiency of 0.62. The role played by electron-withdrawing substituent fluorine on the auxiliary ligands and how the substituent influences the luminescent behaviour are discussed.
Co-reporter:Yan Cong, Bin Li, Shumei Yue and Di Fan and Xiao-jun Wang
The Journal of Physical Chemistry C 2009 Volume 113(Issue 31) pp:13974-13978
Publication Date(Web):July 14, 2009
DOI:10.1021/jp8103497
Nanocrystalline ZrO2 fine powders were prepared via the one-pot reaction followed by annealing from 700 to 1100 °C in air. It is believed that generation of excess oxygen vacancies within nanocrystalline ZrO2 is primarily responsible for room-temperature tetragonal phase stabilization below a critical size, and the phase transformation from tetragonal to monoclinic ZrO2 happened in the annealing process. Luminescent properties of ZrO2 were greatly affected by oxygen vacancies in the phase transition process. Two bands centered at 350 and 470 nm were observed in tetragonal ZrO2. The electrons trapped by oxygen vacancies creating F centers recombined with holes yielding the 350 nm luminescence. Temporal decay of the 470 nm luminescence is due to the detrapping of electrons to the Ti3+ luminescence centers. Elevated temperature accelerated the phase transformation to monoclinic ZrO2 and decreased the oxygen vacancy concentration, resulting in a decrease of the 350 nm emission and enhancement of the 470 nm phosphorescence.
Co-reporter:Yan Cong, Bin Li, Shumei Yue, Yanhong Liu and Wenlian Li, Xiao-jun Wang
The Journal of Physical Chemistry C 2009 Volume 113(Issue 2) pp:493-495
Publication Date(Web):2017-2-22
DOI:10.1021/jp8084414
A new phosphor, Eu3+ doped 3CdO-Al2O3-3SiO2 (CAS:Eu3+), is prepared by a convenient sol−gel method. Under excitation either into the 5L6 state with 394 nm or the 5D2 state with 464 nm, the phosphor gives a red emission at 610 nm originating from the 5D0 → 7F2 transition of Eu3+. The luminescence properties compared with YAG:Ce3+ and Y2O3:Eu3+ are studied. The red emission of CAS:Eu3+ is about 3 times stronger than that of commercial Y2O3:Eu3+. The high color saturation (the chromaticity index is x = 0.6209, y = 0.3461) and the low thermal quenching effect make phosphor CAS:Eu3+ a promising candidate for the phosphor-converted white LEDs.
Co-reporter:Liming Zhang, Bin Li and Zhongmin Su
The Journal of Physical Chemistry C 2009 Volume 113(Issue 31) pp:13968-13973
Publication Date(Web):July 9, 2009
DOI:10.1021/jp903774g
In this paper, we propose a potential method leading to high-energy emitting Cu(I) complexes. Diimine ligands with high-π* and their corresponding [Cu(N−N)(P−P)]BF4 complexes are synthesized. Systematic research proves that the utilization of diimine ligands with high-π* is a practicable and effective method to lead to high-energy emission from [Cu(N−N)(P−P)]BF4 complexes. Efficient blue- and green-emitters are realized, and their electroluminescence (EL) performances are also investigated. A maximum brightness of 2850 cd/m2 is achieved for the blue-emitting EL device, with an emission peaking at 480 nm. Meanwhile, the green-emitting EL device reaches a maximum brightness of 2320 cd/m2, with an emission peaking at 532 nm.
Co-reporter:Yan Cong, Bin Li, Bingfu Lei, Xiaojun Wang, Chunxu Liu, Junye Liu, Wenlian Li
Journal of Luminescence 2008 Volume 128(Issue 1) pp:105-109
Publication Date(Web):January 2008
DOI:10.1016/j.jlumin.2007.05.016
Intense photoluminescence at room temperature was observed in amorphous cadmium aluminum silicate doped with europium prepared by the sol–gel method. The structure of the 3CdO–Al2O3–3SiO2:Eu3+ system (CAS:Eu3+) has been determined by transmission electron microscopy (TEM) and X-ray diffraction (XRD). The excitation and the emission spectra indicated that the red characteristic emission (611 nm) of CAS:Eu3+ under UV excitation due to 5D0→7F2 electric dipole transition is the strongest. Both XRD data and the emission ratio of (5D0→7F2)/(5D0→7F1) reveal that the Eu3+ is in a site without inversion symmetry. The maximum photoluminescence intensity has been obtained for 25 mol% concentration of Eu3+ in CAS, and the intensity enhancement and lifetime increase of Eu3+ with increasing sintering temperature were observed due to the less OH-content in the samples.
Co-reporter:Liming Zhang, Bin Li, Bingfu Lei, Ziruo Hong, Wenlian Li
Journal of Luminescence 2008 Volume 128(Issue 1) pp:67-73
Publication Date(Web):January 2008
DOI:10.1016/j.jlumin.2007.05.009
A novel efficient (Φ=0.44) organic yellow-emitting dye, 3-(4-(diphenylamino)phenyl)-1-phenylprop-2-en-1-one (DPPO), was synthesized. The compound was characterized by means of 1H NMR and differential scanning calorimetry (DSC) and analyzed by quantum chemistry method. It was found that DPPO could be effectively excited by the InGaN-based blue LED. Photo-durability data of DPPO were studied. Bright white light of Commission International del’ Eclairage (CIE) x=0.30, y=0.33 was obtained by using DPPO as a light color-conversion material (CCM).
Co-reporter:Binbin Wang, Yana Liu, Bin Li, Shumei Yue, Wenlian Li
Journal of Luminescence 2008 Volume 128(Issue 3) pp:341-347
Publication Date(Web):March 2008
DOI:10.1016/j.jlumin.2007.08.011
The preparation and oxygen sensing properties of optical materials based on two trinuclear starburst ruthenium(II) complexes: [Ru3(bpy)6(TMMB)]6+ (1) and [Ru3(phen)6(TMMB)]6+ (2) (bpy=2,2′-bpyridine, phen=1,10-phenathroline, TMMB=1,3,5-tris[2-(2′-pyridyl)benzimidazoyl]methylbenzene) assembled in two mesoporous silicate (MS) are described in this paper. The luminescence of Ru complexes/silicate assemble materials can be quenched by molecular oxygen with good sensitivity (I0/I1>5 for 2/MS and I0/I1>3 for 1/MS), indicating that trinuclear starburst Ru(II) complexes/MS systems are sensitive to oxygen molecules.
Co-reporter:Zhenjun Si, Jiang Li, Bin Li, Shiyong Liu, Wenlian Li
Journal of Luminescence 2008 Volume 128(Issue 8) pp:1303-1306
Publication Date(Web):August 2008
DOI:10.1016/j.jlumin.2007.12.035
A Cu(I) complex, [Cu(Dppp)(DPEphos)]BF4 (Dppp=2,3-diphenyl-pyrazino[2,3-f][1,10]phenanthroline, DPEphos=Bis[2-(diphenylphosphino)phenyl]ether), is synthesized and used as the dopant in bright electrophosphorescent devices with the general structure ITO/m-MTDATA (30 nm)/NPB (20 nm)/CBP: ×wt% [Cu(Dppp)(DPEphos)]BF4 (30 nm)/Bphen (20 nm)/Alq3 (20 nm)/LiF (0.8 nm)/ Al (200 nm). These devices exhibit a maximum brightness of 4483 cd/m2 and a peak efficiency of 3.4 cd/A. Compared with previously reported similar devices based on Cu(I) complexes, the brightness of the devices presented in this article is the best. Meanwhile, 2% [Cu(Dppp)(DPEphos)]BF4-based devices exhibit white light-emitting properties with CIE coordinates of (0.32. 0.35) at 10 V.
Co-reporter:Haoran Zhang, Bin Li, Bingfu Lei, Wenlian Li
Journal of Luminescence 2008 Volume 128(Issue 8) pp:1331-1338
Publication Date(Web):August 2008
DOI:10.1016/j.jlumin.2007.12.043
Novel oxygen-sensing materials consisting of [Ru(bpy)2(Bpy-Si)]2+ portions covalently grafted onto the backbone of MSU-3 mesostructured silica-based network were prepared in a two-step process with the help of P123 surfactant. The 2,2′-bipyridyl covalently grafted with 3-aminopropyltriethoxysilane was used not only as sol–gel precursor but also as the second ligand of the Ru(bpy)2Cl2·2H2O complex for the preparation of sol–gel-derived silicates for oxygen-sensing materials. The downward oxygen-sensing Stern–Volmer plots can be attributed to the heterogeneous environment of the luminophore within the MSU-3 silica. The MSU-3 sample obtained at 10 °C showed better oxygen-sensing performance due to its special morphology.
Co-reporter:Liming Zhang, Bin Li, Shumei Yue, Mingtao Li, Ziruo Hong, Wenlian Li
Journal of Luminescence 2008 Volume 128(Issue 4) pp:620-624
Publication Date(Web):April 2008
DOI:10.1016/j.jlumin.2007.10.008
A novel ligand, 4-diphenylamino-benzoic acid (HDPAB), and the corresponding Tb (III) complex, Tb (DPAB)3 which can be dissolved easily in organic solvents were synthesized and characterized. Organic electroluminescent (EL) device with a structure of indium tin oxide (ITO)/poly(N-vinylcarbazole) (PVK): Tb (DPAB)3 (50 wt%, 80 nm)/1,3,5-tris-(N-phenylbenzimidazol-2-yl)benzene (TPBI) (30 nm)/tri(8-hydroxyquinoline)aluminum (AlQ) (20 nm)/LiF (1 nm)/Al (150 nm) in which Tb (DPAB)3 acted as an emitter were fabricated. The maximum luminance of 230 cd m−2 at 20 V and the maximum efficiency of 0.62 cd A−1 were obtained due to the introduction of hole-transporting group, representing the best result to date among Tb (III) carboxylate complexes based EL devices. These results indicate that modifications of rare earth complexes are a promising way to improve the properties of EL devices.
Co-reporter:Qingchun Liu, Bin Li, Jian Gong, Yongling Sun, Wenlian Li
Journal of Alloys and Compounds 2008 Volume 466(1–2) pp:314-318
Publication Date(Web):20 October 2008
DOI:10.1016/j.jallcom.2007.11.048
One-dimensional nanomaterials, PVP (poly(vinylpyrrolidone)) fibers doped with [Ru(Bphen)2dppz]Cl2 (Bphen = 4,7-diphenyl-1,10-phenanthroline; dppz = dipyrido[3,2-a:2′,3′-c]phenazine) were prepared by electrospinning technique. The luminescent properties of the composite fibers with diameters between 500 and 900 nm were investigated. Bright red emission centering at 596 nm attributed to the metal (dπ) to ligand (π*) charge-transfer (3MLCT) transition was observed. The composite fibers doped 0.20 wt.% ruthenium(II) complex were optimal, which exhibited the maximum luminescent intensity.
Co-reporter:Binbin Wang, Junfeng Fang, Bin Li, Han You, Dongge Ma, Ziruo Hong, Wenlian Li, Zhongmin Su
Thin Solid Films 2008 Volume 516(Issue 10) pp:3123-3127
Publication Date(Web):31 March 2008
DOI:10.1016/j.tsf.2007.07.194
We report the synthesis of a soluble dendrimers europium(III) complex, tris(dibenzoylmethanato)(1,3,5-tris[2-(2′-pyridyl)benzimidazoly]methylbenzene)–europium(III), and its application in organic electrical bistable memory device. Excellent stability that ensured more than 106 write–read–erase–reread cycles has been performed in ambient conditions without current-induced degradation. High-density, low-cost memory, good film-firming property, fascinating thermal and morphological stability allow the application of the dendrimers europium(III) complex as an active medium in non-volatile memory devices.
Co-reporter:Yan Cong, Bin Li, Bingfu Lei, Wenlian Li
Journal of Luminescence 2007 Volume 126(Issue 2) pp:822-826
Publication Date(Web):October 2007
DOI:10.1016/j.jlumin.2006.12.002
A novel long-lasting afterglow phosphor ZrO2:Ti is prepared by the conventional solid-stated method and their luminescent properties are investigated. A bluish white strong and broad emissive band, which is attributed to originate from the recombination of electrons trapped by F+ centers and the holes created in Valence band, is observed under 254 nm UV irradiation. The identical color long afterglow, which lasts about 1 h, is found in the ZrO2:Ti phosphor after removing the 254 nm UV light. The mechanism of the long lasting phosphorescence (LLP) has been discussed based on the thermoluminescence (TL) results. The replacement of Zr by Ti produces more anion vacancies, resulting in the enhanced photoluminescence (PL) and LLP of ZrO2:Ti sample. These results indicate that ZrO2:Ti phosphor has potential promising applications.
Co-reporter:Liying Zhang, Tianle Li, Bin Li, Bingfu Lei, Shumei Yue, Wenlian Li
Journal of Luminescence 2007 Volume 126(Issue 2) pp:682-686
Publication Date(Web):October 2007
DOI:10.1016/j.jlumin.2006.10.025
A novel europium(III) complex, tris(dibenzoylmethanate){1-[9-hexyl-9H-carbazole]-2-(2-pyridyl)-benzimidazole}europium(III) [Eu(DBM)3(CAR–PyBM)] functionalized by a carbozole fragment, was synthesized and used as emitting material in organic electroluminescent (EL) devices. Compared with the device based on an unfunctional Eu(III) complex, [Eu(DBM)3HPyBM] (HPyBM=2-(2-pyridyl)benzimidazole), the EL performances of the device using [Eu(DBM)3(CAR–PyBM)] as an emitter was significantly enhanced due to the improvement of hole-transporting ability. The maximum efficiency and luminance of red emission achieved from the device with the configuration of ITO/N,N′-diphenyl-N,N′-bis(3-methylphenyl)-1,1′-biphenyl-4,4′diamine (TPD, 50 nm)/ [Eu(DBM)3(CAR–PyBM)] (30 nm)/1,3,5-tirs-(N-phenylbenzimidazol-2-yl)benzene (TPBI, 20 nm)/LiF (1.5 nm)/Al were 4.2 cd/A and 200 cd/m2, respectively.
Co-reporter:Li Ying Zhang, Bin Li, Shu Mei Yue, Wen Lian Li
Chinese Chemical Letters 2007 Volume 18(Issue 3) pp:333-336
Publication Date(Web):March 2007
DOI:10.1016/j.cclet.2007.01.026
A new europium(III) complex, tris(dibenzoylmethanate){1-[9-hexyl-9-carbazole]-2-(2-pyridyl)-benzimidazole}europium(III) [Eu(DBM)3(CPyBM)] was synthesized and used as an electron-acceptor and electron-transport layer in organic photovoltaic (PV) device. Power conversion efficiency achieved from the device was 1.04% under illumination with 365 nm UV light at 1.6 mW/cm2. Compared with the previous reported devices based on Eu(III) complexes, the PV performances were improved. The working mechanism of the organic PV device was discussed.
Co-reporter:Bingfu Lei, Bin Li, Haoran Zhang, Wenlian Li
Optical Materials 2007 Volume 29(Issue 11) pp:1491-1494
Publication Date(Web):July 2007
DOI:10.1016/j.optmat.2006.07.011
A novel reddish orange light emitting phosphor, CaSnO3:Sm3+, is prepared via a two-step approach including the room temperature synthesis of CaSn(OH)6 precursor and then convert it into CaSnO3 by calcination and its optical properties are systematically investigated. X-ray diffraction, photoluminescence, long persistent phosphorescence and thermoluminescence spectra are used to characterize the synthesized phosphor. This phosphor is found to be well-crystallized by calcination at 750 °C for 3 h. Photoluminescence measurement indicates that Sm3+-doped CaSnO3 shows an overall reddish orange emission with a CIE values of x = 0.57, y = 0.37. After irradiation under the 254-nm UV light, the 4G5/2 to 6HJ (J = 5/2, 7/2, 9/2, 11/2) afterglow emissions of Sm3+ are obviously observed. Furthermore, the thermoluminescence and the possible mechanism for the long persistent phosphorescence (LPP) of the CaSnO3:Sm3+ phosphor is also discussed in this paper.
Co-reporter:Yan Ping Wang, Wen Fa Xie, Bin Li, Wen Lian Li
Chinese Chemical Letters 2007 Volume 18(Issue 12) pp:1501-1504
Publication Date(Web):December 2007
DOI:10.1016/j.cclet.2007.10.003
A new 1,3,4-oxadiazole-contanining rhenium(I) complex, with the formula [Re(CO)3(Bphen)(PTOP)], (Bphen = bathophenardine, PTOP = 4-(5-p-tolyl-1, 3, 4-oxadiazd-2-yl) pyridine), is synthesized and characterized by elemental analysis, IR, 1H NMR, UV–vis and luminescence spectroscopy. The double-layer electroluminescence devices based on the Re(I) complex have been fabricated by spin-coating technique. The turn-on voltage, maximum efficiency, and brightness for green emission obtained from the devices are 9 V, 2.1 cd/A and 165 cd/m2, respectively.
Co-reporter:Jianjun Ding, Bin Li, Haoran Zhang, Bingfu Lei, Wenlian Li
Materials Letters 2007 Volume 61(Issue 16) pp:3374-3377
Publication Date(Web):June 2007
DOI:10.1016/j.matlet.2006.11.106
Organically modified silicate (ormosil) materials doped with [4,4′-dimethyl-2,2′-bipyridine-bis(2,2′-bipyridine)] ruthenium(II) dichloride ([Ru-mbpy]2+) and [4,4′-dimethylformate-2,2′-bipyridine-bis(2,2′-bipyridine)] ruthenium(II) dichloride ([Ru-dmfbpy]2+) were prepared by a sol–gel procedure for oxygen-sensing applications. The results indicated that the concentrations of the Ru(II) diimine complexes obviously influenced the linearity of Stern–Volmer plots (I0 /I vs. O2%). The best suitable concentrations of [Ru-mbpy]2+ and [Ru-dmfbpy]2+ in the sol for oxygen sensors were found to be 1.0 × 10− 3 M and 2.5 × 10− 3 M, respectively. The fluorescence quenching time and recovery time of oxygen sensor doped with [Ru-mbpy]2+ (1.0 × 10− 3 M) were 18 s and 38 s and those doped with [Ru-dmfbpy]2+ (1.0 × 10− 3 M) were 13 s and 32 s, respectively. The oxygen sensor based on Ru(II) complex modified by esterification demonstrated excellent linear calibration relationship and improved long-term stability.
Co-reporter:C.B. Liu, J. Li, B. Li, Z.R. Hong, F.F. Zhao, S.Y. Liu, W.L. Li
Chemical Physics Letters 2007 Volume 435(1–3) pp:54-58
Publication Date(Web):12 February 2007
DOI:10.1016/j.cplett.2006.12.044
A novel Re complex functionalized by a hole-transport and an electron-transport groups was utilized to fabricate organic light-emitting devices (OLEDs). A current efficiency up to 8.2 cd A−1 corresponding to a power efficiency of 4.6 ml W−1 and a peak brightness as high as 5500 cd m−2 were obtained. These results represent the best values reported for OLEDs based on rhenium complexes. Short lifetime, enhanced carrier injection capability of Re complex, and efficient charge-trapping followed by exciton confinement in the emissive layer should be responsible for the outstanding electrophosphorescent performances.A novel multicomponent ReI complex (Re–OXD–TPIP) was prepared by introducing a triphenylamine and an oxadizole moieties in the framework of 1,10-phenanthroline molecule. The organic light-emitting devices based on Re-OXD-TPIP demonstrated highly efficient electrophosphorescence.
Co-reporter:B. Lei;B. Li;H. Zhang;S. Lu;Z. Zheng;W. Li;Y. Wang
Advanced Functional Materials 2006 Volume 16(Issue 14) pp:
Publication Date(Web):8 AUG 2006
DOI:10.1002/adfm.200500737
Novel oxygen sensors consisting of a [Ru(bpy)2phen]2+ (bpy: 2,2′-bipyridyl, phen: phenathroline) portion covalently grafted to a mesostructured silica-based network are prepared in situ via a sol–gel approach with the help of cetyltrimethylammoniumbromide (CTAB) surfactant. 1,10-Phenanthroline covalently grafted to 3-(triethoxysilyl)propyl isocyanate is used as not only the sol–gel precursor but also as the second ligand of the Ru(bpy)2Cl2 · 2H2O complex to prepare the sol–gel-derived mesostructured silicates for an oxygen sensor. For comparison purposes, the oxygen sensors in which [Ru(bpy)2phen]Cl2 is conventionally physically incorporated into the matrix are also prepared. Elemental analysis, NMR, Fourier transform IR, UV-vis electronic absorption, luminescence-intensity quenching Stern–Volmer plots, and excited-state decay analysis are used to characterize the obtained oxygen sensors. These obtained bulk xerogels and spin-coated thin films show that the homogeneity and the sensitivity of the covalently grafted samples are superior to those of the physically incorporated ones, and the highest sensitivity is obtained in the mesostructured bulk xerogel. This improvement in oxygen sensitivity is attributed to the increased diffusivity of oxygen in the uniform and nearly parallel porous structure of the Mobil Catalytic Material 41 mesostructured matrix, the enhanced homogeneity results from the covalently grafted propyl group in –Si–(CH2)3– that acts as the fundamental spacer which prevents interaction between the attached RuII complex and the silica matrix, and optimal dispersion in the mesopores during the sol–gel polycondensation. Furthermore, the greatly minimized leaching effect of the sensing molecules could be observed in the covalently grafted system. The covalent grafting strategy presented in this paper provides superior optical oxygen sensors with homogeneous distribution, improved sensitivity, and simplified calibration plots.
Co-reporter:Heping Ma, Bin Li, Liming Zhang, Dong Han and Guangshan Zhu
Journal of Materials Chemistry A 2015 - vol. 3(Issue 38) pp:NaN19352-19352
Publication Date(Web):2015/08/17
DOI:10.1039/C5TA05447H
A series of core–shell porous aromatic frameworks (PAFs) are synthesized for selective detection of nitro-explosives. The conjugated core–shell PAFs possess large surface areas, which can facilitate the pre-concentration of a targeted analyte, leading to superior sensitivity. The tunable LUMO energy levels of these core–shell PAFs make them selectively detect high explosive TNT and TNP from other competing nitro compounds. Moreover, vapor phase detection of nitro aromatics using PPC-PPyS-PAF-2 exhibits a two dimensional fluorescence signal response toward different nitro aromatics. The power to accurately recognize nitro aromatic explosives in the fluorescent 2D map highlights the core–shell PAFs as very promising materials for nitro explosive sensing.
Co-reporter:Jingkai Ni, Chongxin Shan, Bin Li, Liming Zhang, Heping Ma, Yongshi Luo and Hang Song
Chemical Communications 2015 - vol. 51(Issue 74) pp:NaN14056-14056
Publication Date(Web):2015/07/28
DOI:10.1039/C5CC04750A
A novel rhodamine-oxaldehyde (RHO) functionalized β-NaYF4:Yb3+/Er3+ upconversion nanoparticle (UCNP) for specific detection of cysteine (Cys) in aqueous solution was achieved through a Förster resonance energy transfer (FRET) process. Based on self-assembling interaction, hydrophobic upconversion nanoparticles could be modified with α-cyclodextrin to make them water dispersible.
Co-reporter:Liming Zhang ; Bin Li ;Zhongmin Su
Langmuir () pp:
Publication Date(Web):January 26, 2009
DOI:10.1021/la803822s
In this article, we report a phosphorescence enhancement phenomenon of [Cu(N−N)(P−P)]BF4 complexes in the solid state. The phosphorescence enhancement phenomenon is composed of three features: (1) an obvious emission blue shift, (2) a greatly enhanced photoluminescence quantum yield, and (3) a longer excited-state lifetime. Systematic analyses prove that the main cause of this phenomenon is nonradiative process suppression triggered by the π stacking between [Cu(N−N)(P−P)]BF4 molecules. The phorsphorescence enhancement widely exists in [Cu(N−N)(P−P)]BF4 complexes because of the π surfaces in their diimine ligands.
![Phenol, 2-(1H-imidazo[4,5-f][1,10]phenanthrolin-2-yl)-](/data/chemimg/3726600/256525-24-3.png)
![Phenol, 2-(1H-imidazo[4,5-f][1,10]phenanthrolin-2-yl)-](/data/chemimg/3726600/256525-24-3_b.png)
![Spiro[1H-isoindole-1,9'-[9H]xanthen]-3(2H)-one, 2-amino-3',6'-bis(diethylamino)-](/data/chemimg/659200/74317-53-6.png)
![Spiro[1H-isoindole-1,9'-[9H]xanthen]-3(2H)-one, 2-amino-3',6'-bis(diethylamino)-](/data/chemimg/659200/74317-53-6_b.png)
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![Tungstate(3-),tetracosa-m-oxododecaoxo[m12-[phosphato(3-)-kO:kO:kO:kO':kO':kO':kO'':kO'':kO'':kO''':kO''':kO''']]dodeca-,hydrogen (1:3)](http://img.cochemist.com/ccimg/1400/1343-93-7_b.png)
