Novel indolocarbazole-based bipolar host materials for fabricating green phosphorescent organic light-emitting diodes with high efficiency and low roll-off

被引：4

作者：

Shin, Eunju ^{[1
,2
]}

Sung, Baeksang ^{[3
]}

Joo, Chul Woong ^{[4
,5
]}

Kim, Dasol ^{[3
,4
]}

Kim, Jinhwa ^{[3
]}

Lee, Jonghee ^{[3
]}

Kim, Yun-Hi ^{[1
,2
]}

机构：

[1] Gyeongsang Natl Univ, Dept Chem Educ, Jinju 52828, South Korea

[2] Gyeongsang Natl Univ, RIMA, Jinju 52828, South Korea

[3] Hanbat Natl Univ, Dept Creat Convergence Engn, Daejeon 34158, South Korea

[4] Elect & Telecommun Res Inst, Real Device Res Div, Daejeon 34129, South Korea

[5] Sungkyunkwan Univ, Sch Chem Engn, 2066 Seobu Ro, Suwon 16419, Gyeonggi, South Korea

来源：

DYES AND PIGMENTS | 2024年 / 226卷

基金：

新加坡国家研究基金会;

关键词：

Organic light-emitting diode (OLED); Roll; -off; Host material; Phosphorescent OLED; Bipolar host; EXTERNAL QUANTUM EFFICIENCY; CHARGE BALANCE; BLUE; 30-PERCENT; CARBAZOLE; STABILITY;

D O I：

10.1016/j.dyepig.2024.112147

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Herein we report two novel host materials, viz., 2-(dibenzo [b,d]furan-2-yl)indolo [3,2,1-jk]carbazole (ICz-DBF) and 3-(indolo [3,2,1-jk]carbazol-2-yl)furo [2,3-b:5,4-b']dipyridine (ICz-PFP), for fabricating highly stable and efficient organic light-emitting diodes (OLEDs). Green phosphorescent OLEDs (PhOLEDs) based on ICz-DBF and ICz-PFP exhibited less efficiency roll -off than those based on 4,4 '-bis(N-carbazolyl)-1,1 '-biphenyl (CBP) host, and especially, the ICz-DBF-based device achieved a high external quantum efficiency (EQE) of 20.5 %. Bipolar hosts composed of indolocarbazole (ICz) exhibit strong molecular rigidity, high triplet energy, and fast electron transport properties; therefore, they act as acceptors, but dibenzofuran (DBF) and dipyridofuran (PFP) substitutions endow them with controlled electron-donating characteristics. The bipolar properties of the new host materials were demonstrated by single -carrier device analysis, confirming the effectiveness of our research strategy for developing hosts for high-quality OLEDs.

引用

页数：6

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