Aryl-Annulated [3,2-a] Carbazole-Based Deep-Blue Soluble Emitters for High-Efficiency Solution-Processed Thermally Activated Delayed Fluorescence Organic Light-Emitting Diodes with CIEy <0.1

被引：36

作者：

Hwang, Jinhyo ^{[1
]}

Koh, Chang Woo ^{[1
]}

Ha, Jung Min ^{[1
]}

Woo, Han Young ^{[1
]}

Park, Sungnam ^{[1
]}

Cho, Min Ju ^{[1
]}

Choi, Dong Hoon ^{[1
]}

机构：

[1] Korea Univ, Res Inst Nat Sci, Dept Chem, Seoul 02841, South Korea

来源：

ACS APPLIED MATERIALS & INTERFACES | 2021年 / 13卷 / 51期

基金：

新加坡国家研究基金会;

关键词：

deep-blue emitter; solution-process; thermally activated delayed fluorescence; donor engineering; organic light-emitting diode; INDOLOCARBAZOLE; ACCEPTOR; MOIETY; OLEDS;

D O I：

10.1021/acsami.1c15659

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

In this study, we demonstrated two deep-blue TADF emitters, BO-tCzPhICz and BO-tCzDICz, for solution-processable thermally activated delayed fluorescence organic light-emitting diodes (TADF-OLEDs). They were synthesized by employing an organoboron acceptor and 9-(3,6-di-tert-butyl-9H-carbazol-9-yl)-5-phenyl-5,12-dihydroindolo[3,2-a]carbazole (tCzPhICz) and 12-(3,6-di-tert-butyl-9H-carbazol-9-yl)-15H-diindolo[2,3-b: 1',2',3'-lm]carbazole (tCzDICz) as bulky aryl-annulated [3,2-a] carbazole donors, respectively. Both emitters showed sufficient solubility in organic solvents, narrow deep-blue emission, and small energy difference (Delta E-ST) between singlet and triplet states, which can be applied to solution-processable deep-blue TADF-OLEDs. Solution-processed OLEDs exploiting these TADF emitters displayed deep-blue electroluminescence with CIEy <0.1, and high external quantum efficiencies of 17.8 and 14.8% were observed for BO-tCzPhICz and BO-tCzDICz, respectively. The emitter bearing bulky ICz-based donating units shows highly promising potential for high-efficiency solution-processable deep-blue TADF-OLEDs.

引用

页码：61454 / 61462

页数：9

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Aryl-Annulated [3,2-a] Carbazole-Based Deep-Blue Soluble Emitters for High-Efficiency Solution-Processed Thermally Activated Delayed Fluorescence Organic Light-Emitting Diodes with CIEy &lt;0.1

Aryl-Annulated [3,2-a] Carbazole-Based Deep-Blue Soluble Emitters for High-Efficiency Solution-Processed Thermally Activated Delayed Fluorescence Organic Light-Emitting Diodes with CIEy <0.1