Stable deep blue organic light emitting diodes with CIE of y<0.10 based on quinazoline and carbazole units  

作　　者：Bowen Li Xiang'an Song Xi Jiang Zhiyi Li Fengyun Guo Ying Wang Liancheng Zhao Yong Zhang 

机构地区：[1]School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China [2]Key Laboratory of Photochemical Conversion and Optoelectronic Materials,Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,China [3]School of Materials Science and Engineering.Zhengzhou University.Zhengzhou 450001,China

出　　处：《Chinese Chemical Letters》2020年第5期1188-1192,共5页中国化学快报（英文版）

基　　金：supports from the National Key Research and Development Plan(No.2016YFB0401004);supports from the Open Fund of Beijing National Laboratory for Molecular Sciences(BNLMS,No.BNLMS20160131);the Fundamental Research Funds for the Central Universities(Harbin Institute of Technology)。

摘　　要：Achieving stable deep blue organic light emitting diodes(OLEDs)with narrow full width at half maximum(FWHM)and color gamut in the range of the commission International de L’Eclairage(CIE)ofy≤0.10 is still challenging in display and lighting applications.In this investigation,three donor-acceptor(D-A)deep-blue emitters were designed and synthesized via integrating asymmetric quinazoline(PQ)acceptor with weak donating carbazole(Cz)donor.The effect of the position and number of Cz group in PQunit are investigated,which is also first examples for syste matic research about the effect of different position of asymmetric PQ as acceptor on deep OLEDs.Their bandgaps of 3.12~3.19 eV and the singlet state energy levels of 3.12~3.19 eV were found to be sufficiently large to achieve deep blue light.As expected,these emitters-based OLEDs exhibit deep blue emission with the maximum wavelength≤450 nm and narrow FWHM≈60 nm.Especially,a CIE ofy=0.080 was achieved for 4 PQ-Cz-based OLED.Significantly,the deep blue electroluminescence(EL)spectra of these three emitters-based OLEDs are very stable and the corresponding CIE coordinates deviation(ΔCIE(x,y))can be negligible under the applied voltage ranging from 5 V to 9 V.

关 键 词：Organic light-emitting diodes Deep blue em itter QUINAZOLINE CARBAZOLE Electroluminescence 

分 类 号：TN383.1[电子电信—物理电子学]