Effects of Different Eelectron-withdrawing Moieties on the General Photoelectric Properties of Fluorene-based Dimers  

作　　者：YUAN Xinlei LI Jie LU Zhiwei YE Shanghui JIANG Hongji 

机构地区：[1]Key Laboratory for Organic Electronics and Information Displays and Jiangsu Key Laboratory for Biosensors,Jiangsu National Synergetic Innovation Center for Advanced Materials,Institute of Advanced Materials,Nanjing University of Posts and Telecommunications,Nanjing 210042,P.R.China

出　　处：《Chemical Research in Chinese Universities》2020年第6期1174-1182,共9页高等学校化学研究（英文版）

基　　金：Supported by the National Natural Science Foundation of China(No.21574068);the Priority Academic Program Development of Jiangsu Higher Education Institutions,China(No.YX030003).

摘　　要：Here,9,9.9'-tris(4-butoxyphenyl)-9H-9'Hl-2,2'-difluorene(DF)was synthesized as a reference for compa rison,and diphenyl sulfone and triphenylphosphine oxygen were introduced to the 9-position of fluorene througha C-H coupling reaction to produce two fluorene-based oligomers 9′,9′″-sulfonylbis(4.1-phenylene)bis9,9′,9′tris(4-butoxyphenyl)-9H,9'H-2.2'-bifluorene(DF)SOz and phenylbis(4-{9.9,9-tris(4-butoxyphenyl)-9H,9'H-12.2-bif-luorenel-9-yl} phenyl)phosphine oxidel(DF)2POI.Solid powders of all the three compounds exhibit excellent therma stability with thermal temperature at 5%mass loss of 375,429 and 383 C for(DF)2SO2,(DF)PO and DF.In addition,owing to the distorted molecular structure and weak electron-absorbing ability of the acceptor,(DF)Soz and(DF)2PO do not have obvious intramolecular charge transfer characteristics.and exhibit stable localized 394 nm/375 nm fluorescence emission peaks in different polar solvents.The absolute luminescence quantumefficiencies of(DF)2S02,(DF)PO and DF solid powders are 20.83%,10.03%and 59.46%,Compound DF has the highest quantum yield as an electron donor.The chromaticity coordinates of the blue OLED devices based on DF and DF2SO2 fabricated by solution spin coating were(0.19.0.10)and(0.19.0.11).which were closest to the deep blue region,and the corresponding maximum external quantum efficiencies are 1.45%and 0.87%,respectively,which are higher than that of(DF)2PO(0.25%)and consistent with the difference in the solid-state quantum efficiency between them.

关 键 词：Organic light emitting-diode Electron-withdrawing moiety FLUORENE Diphenyl sulfone Tri-phenylphosphine oxide 

分 类 号：O62[理学—有机化学]