Efficient Sky-Blue Organic Light-Emitting Diodes Using a Highly Horizontally Oriented Thermally Activated Delayed Fluorescence Emitter

被引：37
|
作者：
Zhang, Zhen [1 ]
Crovini, Ettore [2 ]
dos Santos, Paloma L. [3 ]
Naqvi, Bilal A. [4 ]
Cordes, David B. [2 ]
Slawin, Alexandra M. Z. [2 ]
Sahay, Prakhar [4 ]
Brutting, Wolfgang [4 ]
Samuel, Ifor D. W. [3 ]
Brase, Stefan [1 ,5 ]
Zysman-Colman, Eli [2 ]
机构：
[1] Karlsruhe Inst Technol KIT, Inst Organ Chem, Fritz Haber Weg 6, D-76131 Karlsruhe, Germany
[2] Univ St Andrews, EaStCHEM Sch Chem, Organ Semicond Ctr, St Andrews KY16 9ST, Fife, Scotland
[3] Univ St Andrews, Sch Phys & Astron, SUPA, Organ Semicond Ctr, St Andrews KY16 9SS, Fife, Scotland
[4] Univ Augsburg, Inst Phys, Expt Phys 4, Univ Str 1, D-86159 Augsburg, Germany
[5] Karlsruhe Inst Technol KIT, Inst Biol & Chem Syst Funct Mol Syst IBCS FMS, Hermann Von Helmholtz Pl 1, D-76344 Eggenstein Leopoldshafen, Germany
来源：
ADVANCED OPTICAL MATERIALS | 2020年 / 8卷 / 23期
基金：
英国工程与自然科学研究理事会; 欧盟地平线“2020”;
关键词：
acceptor– donor– acceptor emitters; blue emitters; horizontal orientation; indolocarbazole; organic light‐ emitting diodes; out‐ coupling effect; thermally activated delayed fluorescence emitters; triazine; SINGLET; ENHANCEMENT;
D O I：
10.1002/adom.202001354
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Organic thermally activated delayed fluorescent (TADF) materials can harvest 100% of the electrically generated excitons as a result of their small singlet-triplet energy difference. However, maximizing the external quantum efficiency (EQE) of a device also requires enhancing the light out-coupling efficiency. This work presents a new acceptor-donor-acceptor (ADA) emitter employing an indolocarbazole donor and diphenyltriazine acceptors that show nearly-completely horizontal orientation regardless of the host matrix, leading to a sky-blue organic light-emitting diode (lambda(EL) = 483 nm, CIE coordinates of 0.17, 0.32) with EQE(MAX) of 22.1%, a maximum luminance of 7800 cd m(-2), and blue emission.
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页数：8
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