π-Extended Phenoxazine-Based Asymmetric MR-TADF Emitters for Narrow Emission Band Green OLEDs with a Power Efficiency of 150 lmW-m, an EQE of 27%, and an LT95 of Over 3000 h at 1000 cdm-2

被引：1

作者：

Nemma, Haruki ^{[1
]}

Kori, Yuma ^{[1
]}

Meguro, Naoki ^{[1
]}

Mimura, Ryunosuke ^{[1
]}

Chiba, Yudai ^{[1
]}

Kido, Junji ^{[1
,2
,3
]}

Sasabe, Hisahiro ^{[1
,2
,3
]}

机构：

[1] Yamagata Univ, Dept Organ Mat Sci, 4-3-16 Jonan, Yonezawa, Yamagata 9928510, Japan

[2] Yamagata Univ, Res Ctr Organ Elect ROEL, 4-3-16 Jonan, Yonezawa, Yamagata 9928510, Japan

[3] Yamagata Univ, Frontier Ctr Organ Mat FROM, 4-3-16 Jonan, Yonezawa, Yamagata 9928510, Japan

来源：

ADVANCED OPTICAL MATERIALS | 2025年 / 13卷 / 02期

关键词：

hyperfluorescence; multi-resonance; organic light-emitting devices; phosphor sensitizer; thermally activated delayed fluorescence; LIGHT-EMITTING-DIODES; FLUORESCENCE; LIFETIME;

D O I：

10.1002/adom.202402131

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Although multi-resonance thermally activated delayed fluorescent (MR-TADF) emitters simultaneously achieve high color purity and high efficiency in organic light-emitting devices (OLEDs), MR-TADF-based OLEDs suffer from severe efficiency roll-off and lifetime issues for practical application. To overcome these issues, a key solution is hyper OLED technology sensitized by TADF or phosphorescent emitters. In this study, a series of pi-extended phenoxazine-based asymmetric MR-TADF emitters for long lifetime, low-power consumption, and narrow emission band green OLEDs is developed. As a sensitizer, a well-known phosphorescent emitter is used, fac-tris(2-phenylpyridinato-C2,N)iridium(III) [Ir(ppy)(3)]. Consequently, these MR-TADF emitters achieve hyper OLEDs with a power efficiency of 150 lmW(-1), an external quantum efficiency of 27%, and a long lifetime LT95 of over 3000 h at high brightness of 1000 cdm(-2). These performances are among the best in scientific literature.

引用

页数：6