Circularly polarised photoluminescence and electroluminescence of chiral copper(i) dimers based on R/S-2,2′-bis(diphenylphosphino)-1,1′-binaphthalene ligands

被引:11
|
作者
Zhou, Yong-Hui [1 ]
Zhang, Ai-Wei [1 ]
Huang, Ru-Jun [1 ]
Sun, Yu-Hang [1 ]
Chen, Zhu-Jun [1 ]
Zhu, Bai-Song [1 ]
Zheng, You-Xuan [2 ]
机构
[1] Nanjing Univ Informat Sci & Technol, Coll Chem & Mat, Nanjing 210044, Peoples R China
[2] Nanjing Univ, Sch Chem & Chem Engn, State Key Lab Coordinat Chem, Nanjing 210023, Peoples R China
关键词
ACTIVATED DELAYED FLUORESCENCE; LUMINESCENCE; POLYMER;
D O I
10.1039/d2tc04895g
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Due to the ability to emit circularly polarised luminescence (CPL) for application in many areas, chiral luminescent materials have undergone rapid development in recent years. Herein, three chiral copper(i) chloro-bridged dimers R/S-(BINAP)(2)Cu(mu-X-2) (X = Cl, Br and I) based on R/S-2,2 '-bis(diphenylphosphino)-1,1 '-binaphthalene (R/S-BINAP) ligands were synthesized conveniently at room temperature with high yields above 95%. Though emissions of the compounds in solution are weak, the dimers in the powder form and doped films displayed strong luminescence. Furthermore, the small singlet-triplet energy level gap and the calculated theoretical frontier molecular orbital distribution overlap suggested that these dimers have thermally activated delayed fluorescence characteristics. In addition, R/S-(BINAP)(2)Cu(mu-X-2) doped films showed mirror symmetric circular dichroism and CPL spectra with a high dissymmetry factor (g) above 1 x 10(-2). However, the corresponding circularly polarised organic light-emitting diodes (CP-OLEDs) fabricated by the evaporation method based on R/S-(BINAP)(2)Cu(mu-I-2) exhibited a high maximum external quantum efficiency of 21.7%. Notably, the CP-OLEDs also displayed mirror imaged circularly polarised electroluminescence spectra with |g(EL)| factors of around 3.0 x 10(-3).
引用
收藏
页码:1329 / 1335
页数:7
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