Shengang Xu

Name:

Organization: Zhengzhou University

Department: School of Materials Science and Engineering

Title:

Chemicals
References

Photorefractive hyper-structured molecular glasses constructed by calix[4]resorcinarene core and carbazole-based methine nonlinear optical chromophore

Co-reporter:Shengang Xu, Chong Fang, Yanzhao Wu, Wenbo Wu, Qing Guo, Jin Zeng, Xuezhao Wang, Yingliang Liu, Shaokui Cao

Dyes and Pigments 2017 Volume 142(Volume 142) pp:

Publication Date(Web):1 July 2017

DOI:10.1016/j.dyepig.2017.03.001

•Seven CRA-based photorefractive (PR) hyper-structured molecular glasses (HSMGs) were synthesized by esterification.•The degrees of introduction of bulky NLO chromophores to the CRA core were higher than 70%.•The Γ values of HSMGs composites are about two times of the corresponding small molecular functional compounds composite.•The Γ value of CRA-CSN/ECz/PCBM (69:30:1, wt.%) composite was 78.2 cm−1 at the external electric field of 12.5 V mm−1.Seven C-methylcalix[4]resorcinarene (CRA)-based photorefractive (PR) hyper-structured molecular glasses (HSMGs) containing carbazole-based methine nonlinear optical (NLO) chromophores were designed and synthesized via esterification between carboxyl-containing asymmetric CRA core molecule and hydroxyl-containing functional compounds. When the feed ratio of hydroxyl-containing NLO functional compounds to carboxyl groups of CRA-COOH was kept at 1.5/1 by mole, the degree of introduction of NLO chromophore to the CRA core was above 70%. All the HSMGs show low glass transition temperatures (Tg), and good solubility in common low boiling point solvents such as THF, CHCl3, etc. Powder XRD and UV–vis absorption in films of HSMGs indicate that the aggregation, packing and crystallization of the NLO chromophores in these HSMGs had been effectively reduced. Doping with N-ethyl-carbazole (ECz) as a plasticizer and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) as a photosensitizer, all the HSMGs composites showed good PR effects. All the coupling gain coefficients (Γ) of HSMGs-based composites are about twice to the corresponding small molecular NLO chromophores-based composites, thanks to the decreased NLO chromophores antiparallel packing caused by the asymmetric CRA core. Among them, CRA-CSN/ECz/PCBM (69:30:1, wt%) composite exhibited the best performance with the Γ value of 78.2 cm−1 at the external electric field of 12.5 V μm−1, which is one of the best performance in molecular glasses under the same test conditions. Coupled with their convenient synthesis, this work will provide a new simple design strategy for organic PR materials.C-methylcalix[4]resorcinarene(CRA)-based photorefractive (PR) hyper-structured molecular glasses (HSMGs) containing carbazole-based methine nonlinear optical (NLO) chromophores were designed and synthesized by the esterification between carboxyl-containing asymmetric CRA core molecule and hydroxyl-containing NLO functional compounds. All the two beam coupling gain coefficients of HSMGs composites are about two times of the corresponding NLO functional compounds composite due to the decrease of NLO chromophores antiparallel packing caused by the asymmetric CRA core.Download high-res image (187KB)Download full-size image

A carbazoletriphenylamine copolymer-bearing pendant europium complexes: Synthesis and luminescence properties

Co-reporter:Yuxia Jin;Weiwei Zuo;Hongyan Gao;Linfeng Fu;Yingliang Liu;Wenbo Wu;Shaokui Cao

Journal of Applied Polymer Science 2015 Volume 132( Issue 46) pp:

Publication Date(Web):

DOI:10.1002/app.42746

ABSTRACT

A novel carbazole–triphenylamine copolymer-bearing pendant bipyridine PM1TPA and corresponding europium (III) complexed polymer PM1TPA–Eu–x, in which the values of x are 0.1, 0.5, and 1.0 representing the molar ratio of bipyridine ligands complexed with Eu(III), were designed and synthesized. Their chemical structures were confirmed by ¹H NMR, FT-IR, and elemental analysis. Both PM1TPA and PM1TPA–Eu shows good solubility in common organic solvents such as tetrahydrofuran (THF) and CHCl₃. The 5% weight loss temperature (T_d^5%) of PM1TPA and PM1TPA–Eu–1.0 are 363^oC and 306^oC, respectively. The photoluminescence (PL) spectra of PM1TPA–Eu in solution consists of two emission bands, one in the 400–570 nm region and another at 612 nm, corresponding to the emission of polymer main chain and europium complexes, respectively. When the concentration of PM1TPA–Eu–1.0 in THF solution increases, the PL intensity in the 400–570 nm regions became more and more weaker. And only the characteristic emission of europium complex was observed in the solid film, which indicates that the excited energy absorbed by the polymer backbone was efficiently transferred to the europium complexes. Furthermore, nearly monochromatic red electroluminescence from europium complex was observed from the polymeric light-emitting diode using PM1TPA–Eu–1.0 as the emissive layer under 25 V forward bias. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42746.