Cyclometalated Ir(III) Complexes for High-Efficiency Solution-Processable Blue PhOLEDs

被引:112
作者
Kozhevnikov, Valery N. [1 ,2 ]
Zheng, Yonghao [1 ]
Clough, Matthew [1 ]
Al-Attar, Hameed A. [3 ]
Griffiths, Gareth C. [3 ]
Abdullah, Khalid [3 ]
Raisys, Steponas [4 ]
Jankus, Vygintas [3 ]
Bryce, Martin R. [1 ]
Monkman, Andrew P. [3 ]
机构
[1] Univ Durham, Dept Chem, Durham DH1 3LE, England
[2] Northumbria Univ, Sch Life Sci, Newcastle Upon Tyne NE1 8ST, Tyne & Wear, England
[3] Univ Durham, Dept Phys, Durham DH1 3LE, England
[4] Vilnius State Univ, Inst Appl Res, LT-10222 Vilnius, Lithuania
基金
英国工程与自然科学研究理事会;
关键词
iridium complex; phosphorescence; electroluminescence; blue emission; OLED; LIGHT-EMITTING-DIODES; IRIDIUM COMPLEXES; ORGANIC ELECTROPHOSPHORESCENCE; ELECTROLUMINESCENT DEVICES; PHOSPHORESCENT EMISSION; TRANSPORT MATERIALS; STATE; SPECTROSCOPY; LAYER; HOST;
D O I
10.1021/cm4010773
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
This article reports the systematic functionalization of FIrpic (1) with solubilizing alkyl groups (complexes 2-4) or mesityl groups (complexes 5 and 6). Complex 5 is shown to offer significant advantages over FIrpic (1) in terms of performance of sky-blue polymer-based phosphorescent organic light-emitting diodes (PhOLEDs) with a solution-processed emitting layer (lambda(EL)(max) 477 nm for 5). Devices with 5 doped into poly(vinylcarbazole) (PVK):OXD-7 gave a maximum luminous efficiency of 19.1 cd A(-1) at a brightness of 5455 cd m(2) with EQE 8.7%. Optimized multilayer deviceswith additional TPBi and LiF layers gave 23.7 cd A(-1) and EQE 10.4%. These data compare favorably with leading literature values for sky-blue polymer-based PhOLEDs. The enhanced performance of 5 is ascribed to three main reasons: (i) reduced concentration quenching of 5, (ii) the higher radiative yield of 5; and (iii) improved solubility of 5 in organic solvents. Complex 5 should find widespread use as a soluble blue phosphor for displays and lighting applications using solution processing techniques.
引用
收藏
页码:2352 / 2358
页数:7
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