YiGe Wang

•Zeolite NIR luminescence materials are prepared by the introduction of Bi3+ within the channels of Yb3+-exchanged zeolite.•We report zeolite NIR luminescence materials with an improved NIR photoluminescence (PL).•The increase of luminescence intensity is attributed to the energy transfer from Bi3+ to Yb3+.•Such a luminescence hybrid material (Yb1Bix@ZL) can be used in c-Si solar cells for efficient conversion of 300–450 nm light.Near infrared luminescence of trivalent lanthanide ions around 900–1600 nm has attracted increasing attention because of its potential applications in optical fiber, telecommunications technologies, solid state lasers and solar cells. Particularly, Yb3+ presents an essential role on solar cells due to its broad emission at 1000 nm matching well with the strongest spectral response of c-Si solar cell. Herein we report Yb3+-Bi3+ co-doped zeolilte L (ZL) hybrid materials through a simple ion exchange process and subsequent annealing at a comparatively low temperature (800 °C) under atmospheric conditions. Such a luminescence material displays a strong, long-lived, and intense broadband tunable NIR photoluminescence (PL) through the energy transfer from Bi3+ to Yb3+, which can be utilized as a potential efficiency-enhancing material for c-Si solar cells.Herein we show Yb3+-Bi3+ co-doped zeolilte L hybrid materials with a strong, long-lived, and intense broadband tunable NIR photoluminescence (PL) through the energy transfer from Bi3+ to Yb3+ resulting from one Bi3+ ion exciting two Yb3+ ions simultaneously. Such a luminescence hybrid material (Yb1Bix@ZL) could be a deserving material for c-Si solar cells for efficient conversion of 300–450 nm light which was not fully utilized by the existing solar cells to 1000 nm NIR light.Download high-res image (187KB)Download full-size image

Color-tunable luminescent Ln3+ composite as self-referencing and ratiometric sensor for low-level water detection in ethanol

Co-reporter:Tianren Wang, Meiqi Liu, Yige Wang

Materials Research Bulletin 2017 Volume 95(Volume 95) pp:

Publication Date(Web):1 November 2017

DOI:10.1016/j.materresbull.2017.08.022

•A novel Ln3+ (Ln = Eu, Tb or Eu and Tb in different molar ratio) complex with tunable luminescence from red to green was prepared through a simple procedure.•The luminescence color of the Eu/Tb co-doped complex can be tuned by water through the luminescence quenching mechanism as well as the variation of energy transfer efficiency from Tb3+ to Eu3+.•The complex with Eu3+:Tb3+ = 1:1 can be applied as self-referencing and ratiometric luminescent sensor for detecting low-content water (0.01–0.5 vol%) in ethanol.Developing simple, fast and sensitive detection of low-level water in organic solvents is in high demand for academic and industrial applications. In this paper, a novel color-tunable lanthanide composite has been prepared by simply mixing 2,2':6',2”-terpyridine-4'-carboxylic acid (Hctpy) and Ln3+ with a molar ratio of 3:1 in absolute ethanol at room temperature, in which the Ln3+ ions are mainly coordinated with carboxyl moieties rather than with terpyridine moieties of Hctpy. In addition, the emission colors of the composite can also be tuned by water, ascribed to the luminescence quenching mechanism and the variation of Tb-to-Eu energy transfer efficiency. Based on these properties, a self-referencing and ratiometric luminescent water detector with the Eu/Tb molar ratio of 1:1 has been developed, showing proportional relationship between the intensity ratio of 5D0 → 7F2 transition of Eu3+ to 5D4 → 7F5 transition of Tb3+ (IEu/ITb) and the water concentration (0.01–0.5 vol%) in ethanol.A new color-tunable luminescent Ln3+ (Ln = Eu, Tb or Eu and Tb in different molar ratio) composite was prepared through a simple method, which can be applied as self-referencing and ratiometric sensor for detecting low-level water content (0.01-0.5 vol%) in ethanol.Download high-res image (163KB)Download full-size image

Novel fluorescent terphenyl bridged crystalline silsesquioxane through self-directed assembly

Co-reporter:Caixia Liu;Zhiqiang Li

Journal of Sol-Gel Science and Technology 2017 Volume 81( Issue 2) pp:593-599

Publication Date(Web):15 October 2016

DOI:10.1007/s10971-016-4219-5

A novel silsesquioxane hybrid crystal was synthesized by a facile synthesis and purification process without any structure-directing agent. fourier transform-infrared spectoscopy, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, 13C, 29Si solid-state nuclear magnetic resonance spectroscopy and photoluminescence spectroscopy were employed to characterize the obtained material. X-ray diffraction and transmission electron microscopy revealed the well-ordered features with lamellar spacings in the bridged silsesquioxanes. In addition, the formation of crystalline bridged polysilsesquioxanes with well-organized structure was attributed to self-assembly of the intermolecular hydrogen bonding between the urea groups. Interestingly, the introduction of photoactive terphenyl chromophore into silsesquioxane made bridged polysilsesquioxanes exhibit special fluorescent properties, which could provide a way to fabricate new nanomaterial.We successfully synthesized a novel crystalline hybrid bridged polysilsesquioxanes (BPS) with well-ordered features arising from the self-assembling of the precursors. Interestingly, the introduction of photoactive terphenyl chromophore into silsesquioxane made hybrid material BPS exhibit bright blue emission.Open image in new window

Solvent free mechanochemical synthesis of Eu3+ complex and its luminescent sensing of trace water and temperature

Co-reporter:Daqing Yang;Zhiqiang Li;Liang He;Yucheng Deng

RSC Advances (2011-Present) 2017 vol. 7(Issue 24) pp:14314-14320

Publication Date(Web):2017/03/03

DOI:10.1039/C6RA28099D

Mechanochemical transduction processes which translate macroscopic forces into chemical reactions are a design method to synthesize new advanced functional materials. Herein we present a simple, facile and solventless method for the formation of a Eu3+ coordination complex by simply grinding 4′,4′′′′-(1,4-phenylene)bis(2,2′:6′,2′′-terpyridine) and EuCl3·6H2O in a mortar for a short time. The resulting complex exhibits outstanding stimuli-responsive emissions for temperature and trace water in organic solvents. The ratiometric luminescence determination method based on the emission intensity ratio of two independent transitions of Eu3+ provides a way to rapidly detect traces of water (0.1–5% v/v) in various organic solvents through the luminescence quenching mechanism. Furthermore, by virtue of the temperature-dependent luminescent behavior, the complex allows for the design of a thermometer with an excellent linear response to temperature over a wide range, from 80 to 420 K with a high relative sensitivity of 0.52% per K at 300 K and an unprecedented high sensitivity of 10.26% per K at 420 K. The dynamically reversible complexation between Eu3+ and the ligand facilitates its application as a smart material.

Zirconia-based luminescent organic-inorganic hybrid materials with ternary europium (III) complexes bonded

Co-reporter:Jing Yang, Zhiqiang Li, Yang Xu, Yige Wang

Optical Materials 2016 Volume 55() pp:78-82

Publication Date(Web):May 2016

DOI:10.1016/j.optmat.2016.03.018

•The material was achieved via linking Eu(tta)3 to ZrO2 using Carb-Terpy a linker.•The transparent, luminescent film was made by mixing the hybrid material with PMMA.•The films possess potential application in solar concentrator aspect.In this work, a novel red-emitting organic-inorganic hybrid material with europium (III) lanthanide β-diketonate complexes linked to a zirconia was reported, which was realized by adduct formation with zirconia-tethered terpyridine moieties. Luminescence enhancement of the hybrid material has been observed compared with pure Eu(tta)3·2H2O. Transparent and strongly luminescent thin films based on PMMA were also prepared at room temperature, which are highly luminescent under UV-light irradiation and possess a promising prospect in the area of optics.

A red light-emitting ionic europium (III) complex applied in near UV LED

Co-reporter:Daqing Yang, Yang Xu, Yalan Yao, Jinhui Zhang, Jing Wang, Yige Wang

Synthetic Metals 2016 Volume 221() pp:236-241

Publication Date(Web):November 2016

DOI:10.1016/j.synthmet.2016.08.016

•We report a stable Eu3+ ternary complex with terpyridine-functionalized ionic liquid as one of the ligands.•The thermo- and photo-stability of the complex improved significantly compared with Eu(TTA)3⋅2H2O.•We fabricate the red-LED by coating the phosphors onto near-UV InGaN-based ultraviolet chips.A stable europium (III) ternary complex denoted as Eu(TTA)3-tpyIL was obtained by the coordination of Eu(TTA)3·2H2O to a terpyridine-functionalized ionic liquid. The luminescent properties were investigated at room temperature. From the studies of thermo-and photo-stability, compared with the Eu(TTA)3·2H2O, both emission intensity and luminescence decay based on the complex was almost no significant decrease after enduring high temperature and long-term UV irradiation. Then red-light-emitting diodes (LEDs) were fabricated by coating complexes onto 370 nm-emitting InGaN chips. The light emission from the InGaN chips could be completely absorbed in the spectra of LED. The chromaticity coordinates of them were calculated from emission spectra and show in CIE color diagram. All these results indicate that the Eu(III) complex is promising as phosphor for fabrication of WLEDs.

Near-infrared luminescent PMMA films containing Yb3+-complexes: preparation and characterization

Co-reporter:Zhaohui Hou;Caixia Liu;Gang Feng;Zhiqiang Li

Colloid and Polymer Science 2016 Volume 294( Issue 9) pp:1495-1501

Publication Date(Web):2016 September

DOI:10.1007/s00396-016-3913-8

Lanthanide luminescent soft materials have attracted broad attention due to their unique optical properties and functional versatility. Particularly, due to their characteristic sharp bands, near-infrared luminescent thin films employing lanthanide ion (Ln3+) complexes as the emitting sources have shown great potential applications in biological imaging, telecommunications, lasers, organic light-emitting diode devices, and solar cells. In this work, by loading Yb3+ complexes into polymethylmethacrylate (PMMA) matrix, we report a series of luminescent thin films which can tailor UV and visible light to near-infrared (NIR) range through the energy transfer from organic antenna molecule to Yb3+ ion. Benefiting from the negligible absorption of PMMA in the range of 300 to 2500 nm, our thin films show high transparency, good thermal stability, and extraordinary processability. This strategy can be easily applied to other lanthanide precursors, and the desired tailoring bands can be easily controlled by an appropriate choice of different organic ligands. These properties make them competitive candidates in down-conversion materials.

Preparation and Properties of Transparent Ultrathin Lanthanide-Complex Films

Co-reporter:Yali Li;Dr. Yang Xu ; Yige Wang

Chemistry - A European Journal 2016 Volume 22( Issue 31) pp:10976-10982

Publication Date(Web):

DOI:10.1002/chem.201601189

Abstract

Highly transparent ultrathin films (UTFs) based on alternative layer-by-layer assembly of Eu- and Tb-based lanthanide complexes (LCs) and Mg–Al-layered double hydroxide (LDH) nanosheets are reported herein. UV–visible absorption and fluorescence spectroscopy showed an orderly growth of the two types of ultrathin films upon increasing the number of deposition cycles. AFM and SEM measurements indicate that the films feature periodic layered structures as well as uniform surface morphology. Luminescent investigations reveal that (LCs/LDH)_n UTFs can detect Fe³⁺ with relative selectivity and high sensitivity (Stern–Volmer constant K_SV=8.43×10³ L mol⁻¹); this suggests that (LCs/LDH)_n UTFs could be a promising luminescent probe for selectively sensing Fe³⁺ ion.

Lanthanide Luminescence Improvement by Using a Functional Poly(Ionic Liquid) as Matrix and Co-ligand

Co-reporter:Dr. Zhiqiang Li;Jin Wang;Meng Chen;Dr. Yige Wang

Chemistry – An Asian Journal 2016 Volume 11( Issue 5) pp:745-749

Publication Date(Web):

DOI:10.1002/asia.201501209

Abstract

A poly(ionic liquid) (BA-PIL) carrying a benzoic acid group in each repeating unit of the polymer architecture, which has the dual function of acting as a matrix and second ligand, has been developed. Through the incorporation of BA-PIL with the complex [Ln(hfa)₃] (hfa=hexafluoroacetylacetone) as an emitting precursor, significant luminescence improvement was achieved in the obtained hybrid materials. Confinement of the lanthanide(III) complexes within the rigid chains of the polymer, together with replacement of the coordinated water molecules, are believed to be ascribed to the enhanced optical properties.

Aqueous synthesis of stable and luminescent flexible non-covalently assembled europium(III) complexes–organoclay films

Co-reporter:Tianren Wang, Meiqi Liu, Quan Ji and Yige Wang

RSC Advances 2015 vol. 5(Issue 125) pp:103433-103438

Publication Date(Web):30 Nov 2015

DOI:10.1039/C5RA21828D

In this paper, we report a novel lanthanide luminescent hybrid material that prepared by simple supramolecular co-assembly of aminoclay (AC), Eu(TTA)3·2H2O and deprotonated 4′-para-phenylcarboxyl-2,2′:6′,2′′-terpyridine (Na-Carb-Terpy) in aqueous system at room temperature. Bright red luminescence dominated by 5D0 → 7F2 transition (λem = 614 nm) of Eu3+ can be observed under appropriate UV light illumination. The hybrid material exhibits optimal luminescent properties coupled with good water dispersibility when the initial addition amount of AC and Terpy moieties is 4:1 in molar ratio. A consequence is that flexible, transparent and strong red-light-emitting thin film based on water-soluble polymer poly(vinyl alcohol) (PVA) has been successfully prepared, showing better luminescent properties than the hybrid material, as well as improved photo- and thermo-stability compared with pure Eu(TTA)3·2H2O.

Enhanced NIR Luminescence of Nanozeolite L Loading Lanthanide -Diketonate Complexes

Co-reporter:Dong Liang;Zhiqiang Li;Peng Li;Yuhuan Chen;Shuming Zhang

Chinese Journal of Chemistry 2015 Volume 33( Issue 12) pp:1389-1392

Publication Date(Web):

DOI:10.1002/cjoc.201500540

Abstract

Herein, we report the preparation of zeolite NIR luminescence materials with a remarkable increase of luminescence intensity by attaching stopper molecule (an imidazolium salt) to the channel entrances of zeolite L loading with NIR lanthanide (Er³⁺ or Nd³⁺) β-diketonate complexes. This results from the formation of Ln³⁺-β-diketonate complexes (Ln=Er or Nd) with high coordination numbers through the decreasing of the proton strength in the zeolite channels. The obtained materials were characterized with SEM and photoluminescence spectroscopy. We believe that this hybrid material will be an appealing candidate for the applications of optical fiber, telecommunications and bio-imaging.

Transparent and luminescent ionogels composed of Eu3+-coordinated ionic liquids and poly(methyl methacrylate)

Co-reporter:Fan Zhou;Tianren Wang;Zhiqiang Li

Luminescence 2015 Volume 30( Issue 8) pp:1303-1307

Publication Date(Web):

DOI:10.1002/bio.2897

Abstract:

We report here on transparent and luminescent ionogels that consist of ionic ternary europium (III) complexes and the inexpensive non-toxic compound, poly(methyl methacrylate) (PMMA) and that were formed by dissolving these complexes in methacrylate (MMA) monomers followed by in situ polymerization. The resulting ionogels show a bright red emission under near-UV light irradiation. Luminescence data confirm the energy transfer from terpyridine-functionalized ionic liquid to Eu³⁺ ions. Copyright © 2015 John Wiley & Sons, Ltd.

Luminescent materials derived from the surface-modification of Ln3+-doped zeolite L with a silylated terpyridine

Co-reporter:Zhiqiao Qin, Hongshi Li, Yige Wang

Optical Materials 2014 Volume 37() pp:483-487

Publication Date(Web):November 2014

DOI:10.1016/j.optmat.2014.07.010

•Luminescent materials modified with silylated terpyridine.•Coordinate and sensitize lanthanide ions Eu3+ and Tb3+ successfully.•A long Eu3+5D0 lifetime value of 0.710 ms and Tb3+5D4 lifetime value of 0.800 ms.Herein we report luminescent materials of Ln3+ (Ln = Eu or Tb) doped disc shaped zeolite L crystals (Eu3+/ZLD, Tb3+/ZLD) modified with a silylated terpyridine (Terpy-Si). The modified crystals show bright red emission and green emission under UV-light irradiation due to the energy transfer from the Terpy-Si to the Eu3+ and Tb3+ ions. The obtained materials were characterized with FT-IR, SEM, XRD and elemental analysis. Luminescence spectroscopy was used to study the luminescence properties of the modified Eu3+(Tb3+)/ZLD crystals. The formation of europium(III) and terbium(III) Terpy-Si silicon complexes and energy transfer from Terpy-Si to Eu3+ ions and Tb3+ have been confirmed by luminescence spectroscopy.Graphical abstractLn3+ (Ln = Eu or Tb) doped disc shaped ZL crystals (Eu3+/ZLD, Tb3+/ZLD) modified with a silylated terpyridine (Terpy-Si) show bright red emission and green emission under UV-light irradiation (365 nm). Terpy-Si consisting of a reactive siloxane group and a light absorbing moiety, can coordinate and sensitize lanthanide ions Eu3+ and Tb3+ successfully.

A luminescent ionogel based on an europium(III)-coordinated carboxyl-functionalized ionic liquid and gelatin

Co-reporter:Man Li, Yige Wang, Yuhuan Chen and Shuming Zhang

Photochemical & Photobiological Sciences 2014 vol. 13(Issue 7) pp:1025-1030

Publication Date(Web):27 Mar 2014

DOI:10.1039/C4PP00076E

In this work, we report the preparation and luminescent properties of a novel luminescent ionogel consisting of a carboxyl-functionalized ionic liquid, Eu3+ ions and gelatin. The obtained ionogel was investigated by FT-IR, SEM and photoluminescence spectroscopy. FT-IR spectra show that both the ionic liquid and the gelatin are coordinated to Eu3+ ions through oxygen atoms. Luminescence data confirm that Eu3+ ions are well-protected by the ionic liquid and gelatin from deleterious quenching interactions with water molecules.

Preparation, characterization and luminescence of transparent thin film of ionogels

Co-reporter:Zengpeng Fan;Zhixin Xue;Li Zhang

Journal of Sol-Gel Science and Technology 2014 Volume 72( Issue 2) pp:328-333

Publication Date(Web):2014 November

DOI:10.1007/s10971-014-3407-4

The sol–gel fabrication of luminescent and transparent thin film of ionogels containing trivalent lanthanide complexes have been obtained from the silylated ionic liquid in the presence of lanthanide salts (Ln3+, Ln=Tb and Eu) and organic ligands. The resulting thin films were investigated by FT-IR spectroscopy, scanning electron microscopy and luminescence spectroscopy. FT-IR spectra reveal the hydrolysis and condensation of the silylated ionic liquid as well as the formation of luminescent lanthanide complexes in the thin films. Scanning electronic microscope images show the homogeneous characteristic of the thin films.

Luminescent host–guest materials of electrostatically adsorbed Eu3+(tta)3-tpyIL on zeolite L crystals

Co-reporter:Peng Li, Dongyue Wang, Dong Liang, Li Zhang, Shuming Zhang, Yige Wang

Materials Research Bulletin 2014 55() pp: 216-220

Publication Date(Web):

DOI:10.1016/j.materresbull.2014.04.011

Uniformly microsized luminescent materials obtained through a solid state reaction of WO3 with Ln3+-exchanged zeolite L at 700°C

Co-reporter:Yige Wang, Yi Fang, Wenjun Zhang, Li Zhang, Yuhuan Chen, Xiaoyan Yu

Materials Research Bulletin 2013 48(6) pp: 2149-2153

Publication Date(Web):

DOI:10.1016/j.materresbull.2013.02.019

Preparation and luminescence of europium(III) terpyridine complex-bridged polysilsesquioxanes

Co-reporter:Pengmei Zhang, Yige Wang, Huanhuan Liu and Yuhuan Chen

Journal of Materials Chemistry A 2011 vol. 21(Issue 45) pp:18462-18466

Publication Date(Web):20 Oct 2011

DOI:10.1039/C1JM12894A

Luminescent europium(III) terpyridine complex-bridged polysilsesquioxanes were prepared by hydrolysis and condensation of a precursor composed of a terpyridyl ligand bearing a urea group and a reactive siloxane part in the presence of europium(III) salts. Elementary analysis, FT-IR, SEM, luminescence spectra and luminescence decay analysis were employed to characterize the resulting materials. The effect of counteranions in the europium(III) salts on the morphology and luminescent properties of polysilsesquioxanes is investigated and discussed. It has been shown that porous europium(III) terpyridine complex-bridged polysilsesquioxanes can be obtained with Eu(ClO4)3·6H2O whereas materials composed of irregular and aggregated nanoparticles are achieved when the perchlorate counteranions were replaced by chloride ones. The decay time of Eu3+ ions of the luminescent materials becomes longer as the molar ratio of the precursor to Eu3+ ions increases.

Rectangular-plate like organosilica microcrystals based on silylated β-diketone and lanthanide ions

Co-reporter:Yu Wang, Yige Wang, Pengpeng Cao, Yanni Li and Huanrong Li

CrystEngComm 2011 vol. 13(Issue 1) pp:177-181

Publication Date(Web):27 Aug 2010

DOI:10.1039/C0CE00014K

We report here the preparation of luminescent organosilica microcrystals with rectangular-plate morphology by a facile method of reacting silylated β-diketone with lanthanide ions under reflux without any structure-directing agent. Factors affecting the formation of the morphology including reaction temperature and the molar ratio of lanthanide/β-diketone are discussed. FTIR, SEM, XRD, 29Si solid-state NMR spectroscopy and photoluminescence spectroscopy were employed to characterize the obtained microcrystals. Photoluminescence studies show the luminescence of the material is of high monochromatic purity. The 5D0 quantum efficiency of Eu3+ ions was estimated based on the decay time Eu3 + 5D0 excited level and the emission spectrum of the organosilica microcrystals.

The sensitized emission of Eu3+ and Tb3+ by 4-fluorobenzophenone confined in zeolite L microcrystals

Co-reporter:Yanxia Ding, Yige Wang, Yanni Li, Pengpeng Cao and Tiezhen Ren

Photochemical & Photobiological Sciences 2011 vol. 10(Issue 4) pp:543-547

Publication Date(Web):11 Jan 2011

DOI:10.1039/C0PP00314J

Disc-shaped zeolite L crystals having a narrow size distribution were prepared and characterized. Luminescent materials were prepared by insertion of 4-fluorobenzophenone into the channels of Ln3+-exchanged zeolite L microcrystals via the gas diffusion method. The obtained materials were characterized by SEM, elementary analysis, diffuse reflectance spectroscopy and photoluminescence spectroscopy. Energy transfer from 4-fluorobenzophenone to Eu3+ or Tb3+ or to both Eu3+ and Tb3+ can occur in the channels. The emission color of the resulting materials can be tuned by varying the relative amount of Eu3+ and Tb3+.

Highly transparent and luminescent lanthanide ion-containing bridged polysilsesquioxanes

Co-reporter:Yige Wang and Nana Lin

Photochemical & Photobiological Sciences 2011 vol. 10(Issue 1) pp:42-47

Publication Date(Web):26 Oct 2010

DOI:10.1039/C0PP00197J

Novel luminescent bridged polysilsesquioxane monoliths of high transparency have been obtained by hydrolysis and condensation of the precursor under acidic conditions. The monoliths were characterized by FTIR spectroscopy, photoluminescence spectroscopy, and SEM, and they have been used as hosts of Eu3+, Tb3+ and Nd3+ ions. The luminescence lifetime of Tb3+ in this host was 2.1 ms. The interaction between the host and the lanthanide ions could be confirmed by FTIR spectra. The number of water molecules coordinated to the Eu3+ ions was determined to be one. Incorporation of Nd3+ as guest resulted in NIR-luminescent materials.

Luminescent organic–inorganic hybrid materials based on lanthanide containing ionic liquids and sylilated β-diketone

Co-reporter:Yige Wang;Yu Feng;Hongsheng Zhao

Journal of Sol-Gel Science and Technology 2011 Volume 58( Issue 3) pp:711-715

Publication Date(Web):2011 June

DOI:10.1007/s10971-011-2450-7

In this work, we report the luminescent organic–inorganic hybrid materials prepared by hydrolysis and condensation of sylilated β-diketone under acid conditions in the presence of carboxyl-functionalized ionic liquid in which Eu3+ ions are coordinated to the oxygen atoms of carboxylate groups from the ionic liquids. The obtained materials were characterized with FT-IR, TG and photoluminescence spectroscopy. FT-IR spectra imply that Eu3+ ions are still coordinated to the ionic liquid in the hybrid materials. Excitation and emission spectra demonstrate that the energy transfer occurs from the β-diketone molecules covalently bonded with silica to Eu3+ ions. The Eu3+ (5D0) quantum efficiency value of the hybrid materials has been estimated based on the emission spectrum and the value of lifetime. A large value of ratio (16.44) between the intensities of the 5D0→7F2 and 5D0→7F1 transition and high value of 5D0 quantum efficiency (51.01%) are obtained.

Synthesis and luminescence properties of spherical bridged polysilsequioxanes activated by lanthanide ions

Co-reporter:Yu Wang;Quanying Gan

Journal of Sol-Gel Science and Technology 2010 Volume 56( Issue 2) pp:141-144

Publication Date(Web):2010 November

DOI:10.1007/s10971-010-2287-5

Luminescent microspherical bridged polysilsequioxane were prepared by heating the mixture of lanthanide ions (EuCl3 or TbCl3) and bis-silylated bipyridine having dual roles, i.e. the bipyridine moieties can sensitize the luminescence of Eu3+ (or Tb3+) ions and the alkoxysilane substituent can be hydrolyzed and condensed via sol–gel process to create inorganic silica framework. The obtained microspheres were systematically investigated by IR spectroscopy, scanning electron microscopy, absorption spectroscopy, PL excitation and emission spectroscopy. IR spectra indicate that the silylated bipyridine has been hydrolyzed under the reaction conditions. SEM images show the microspherical morphology of the luminescent materials. It has been confirmed that the strong luminescence of the spherical bridged polysilsequioxanes is due to the effective energy transfer from the silylated bipyridine to the chelated lanthanide ions.

Green synthesis of luminescent soft materials derived from task-specific ionic liquid for solubilizing lanthanide oxides and organic ligand

Co-reporter:Huanrong Li, Peng Liu, Huifang Shao, Yige Wang, Youxuan Zheng, Zheng Sun and Yuhuan Chen

Journal of Materials Chemistry A 2009 vol. 19(Issue 31) pp:5533-5540

Publication Date(Web):18 Jun 2009

DOI:10.1039/B902663K

Herein we report a facile method to prepare highly luminescent soft materials based on task-specific ionic liquids which can solubilize lanthanide oxides and the organic ligand. The luminescent soft materials are obtained by directly dissolved lanthanide oxides and organic ligand (2-Thenoyltrifluoroacetone (TTA), 1, 10-phenanthroline (Phen)) into carboxyl-functionalized ionic liquid aided with an appropriate amount of water. FT-IR, TGA and luminescence spectroscopy were employed to characterize the lanthanide-containing ionic liquids. Up to 25 mol % lanthanide ions (i.e., the molar ratio of IL/Ln3+ = 3:1) can be incorporated into the task-specific ionic liquids. Optical properties of the soft materials such as colour, luminescence can be adapted by simply changing the type of lanthanide ions and/or adding to organic ligand.

Soft material with intense photoluminescence obtained by dissolving Eu2O3 and organic ligand into a task-specific ionic liquid

Co-reporter:Huanrong Li, Huifang Shao, Yige Wang, Dashan Qin, Binyuan Liu, Wenjun Zhang and Weidong Yan

Chemical Communications 2008 (Issue 41) pp:5209-5211

Publication Date(Web):10 Sep 2008

DOI:10.1039/B810631B

A task-specific ionic liquid containing a carboxylate group with the ability to dissolve metal oxide and organic ligands has been used as the solvent to prepare lanthanide complexes without the addition of extra solvent; thus a soft material with intense photoluminescence has been obtained by directly dissolving Eu2O3, 2-thenoyltrifluoroacetone (TTA) and 1,10-phenanthroline (Phen) into the task-specific ionic liquid.

Green synthesis of luminescent soft materials derived from task-specific ionic liquid for solubilizing lanthanide oxides and organic ligand

Co-reporter:Huanrong Li, Peng Liu, Huifang Shao, Yige Wang, Youxuan Zheng, Zheng Sun and Yuhuan Chen

Journal of Materials Chemistry A 2009 - vol. 19(Issue 31) pp:NaN5540-5540

Publication Date(Web):2009/06/18

DOI:10.1039/B902663K

Soft material with intense photoluminescence obtained by dissolving Eu2O3 and organic ligand into a task-specific ionic liquid

Co-reporter:Huanrong Li, Huifang Shao, Yige Wang, Dashan Qin, Binyuan Liu, Wenjun Zhang and Weidong Yan

Chemical Communications 2008(Issue 41) pp:NaN5211-5211

Publication Date(Web):2008/09/10

DOI:10.1039/B810631B

Preparation and luminescence of europium(III) terpyridine complex-bridged polysilsesquioxanes

Co-reporter:Pengmei Zhang, Yige Wang, Huanhuan Liu and Yuhuan Chen