摘要
基于螺[芴-9,9′-氧杂蒽]的位阻结构,在其芴端连接苯并噻唑构成共轭扩展的环金属配体,并成功合成了相应的均配、面式构型铱(Ⅲ)配合物fac-Ir(SFXbtz)3.配合物的最强发射峰位于587 nm,在635 nm处伴有肩峰发射;其在溶液中的磷光寿命为316ns,光致发光量子产率达到64.7%.以fac-Ir(SFXbtz)3为发射材料,在高掺杂浓度下分别制备了橙光电致发光器件及与蓝光材料FIrpic(双(4,6-二氟苯基吡啶-N,C^2)吡啶甲酰合铱)组合的二元白光器件.以CBP(4,4’-二(9-咔唑)联苯)为主体材料的橙光器件最高电流效率和功率效率为10.8 cd·A^-1和8.4 lm·W^-1,最大亮度为7217 cd·m^-2.二元白光器件最高电流效率和功率效率为11.6cd·A^-1和8.0lm·W^-1,最大亮度为8763cd·m^-2,在3~9V操作电压下CIE1931色坐标稳定.结果表明:协同利用螺环芳烃的共轭结构和位阻结构优势,是获得低成本、本征光电性质良好及可高浓度掺杂的磷光铱(Ⅲ)配合物的便捷方法.
It is an important pathway in the field of phosphorescent organic light-emitting diodes(PhOLED)that endowing iridium(Ⅲ)emitters with the features of low-cost,decent photoelectric properties,and high doping-concentration application by harmonizing electronic and steric effects of corresponding ligands.Based on our previous research that introducing spiro ligand into Ir^Ⅲcomplexes to protect emitting-center and to suppress concentration quenching,herein,for pushing the emission to orange region,we extend the conjugated structure of spiro[fluorene-9,9′-xanthene](SFX)by connected benzo[d]-thiazole-2-yl on the fluorene moiety of SFX via Suzuki-Miyaura coupling,acting as a new spiro ligand.A homoleptic IrⅢcomplex,fac-Ir(SFXbtz)3,was synthesized successfully,and the structure and the photophysical and electrochemical properties were studied by nuclear magnetic resonance,single crystal X-ray diffraction,absorption and emission measurements,as well as cyclic voltammetry.The crystallographic data revealed an enlarged Ir···Ir distance and weakly intermolecularπ-πinteractions between the spiro ligands.The emission spectrum of fac-Ir(SFXbtz)3 showed a maximum peak at 587 nm and a shoulder peak at 635 nm with a photoluminescence(PL)quantum yield(QY)of 64.7%(relative to tris[2-phenylpyridinato-C2,N]iridium(Ⅲ),PLQY=40%).The highest occupied molecular orbital level was determined to be-5.28 eV according to the onset oxidation potential(0.48 V).In view of the orange light-emitting and the high PLQY of fac-Ir(SFXbtz)3,the monochromatic and two-element white PhOLED were fabricated to investigate its electroluminescence(EL)performance in high doping concentrations,ω=12%for monochromatic device andω=15%for two-element white device,respectively.The EL spectrum of the monochromatic Ph OLED(device D1)using common 4,4’-bis(N-carbazolyl)-1,1’-biphenyl as host exhibits two emission peaks,a maximum emission peak at 581 nm and shoulder emission peak at 631 nm,corresponding to its PL spectrum.The device D1 shows a peak per
作者
任保轶
依建成
钟道昆
赵玉志
郭闰达
盛永刚
孙亚光
解令海
黄维
Ren,Bao-Yi;Yi,Jian-Cheng;Zhong,Dao-Kun;Zhao,Yu-Zhi;Guo,Run-D;Sheng,Yong-Gang;Sun,Ya-Guang;Xie,Ling-Hai;Huang,Wei(Key Laboratory of Inorganic Molecule-Based Chemistry of Liaoning Province,College of Applied Chemistry,Shenyang University of Chemical Technology,Shenyang 110142;Key Laboratory for Organic Electronics and Information Displays,Institute of Advanced Materials(IAM),Nanjing University of Posts&Telecommunications,Nanjing 210023;Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430074)
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2020年第1期56-62,共7页
Acta Chimica Sinica
基金
辽宁省高等学校创新人才支持计划(LR2018018)
辽宁省自然科学基金(No.20180550539)
沈阳市科学技术计划项目(No.18-013-0-26)
江苏省有机电子与信息显示重点实验室—省部共建国家重点实验室培育基地开放研究基金资助.
