Fused-Nonacyclic Multi-Resonance Delayed Fluorescence Emitter Based on Ladder-Thiaborin Exhibiting Narrowband Sky-Blue Emission with Accelerated Reverse Intersystem Crossing

被引：164

作者：

Nagata, Masakazu ^{[1
]}

Min, Hyukgi ^{[2
,3
]}

Watanabe, Erika ^{[1
]}

Fukumoto, Hiroki ^{[1
]}

Mizuhata, Yoshiyuki ^{[4
]}

Tokitoh, Norihiro ^{[4
]}

Agou, Tomohiro ^{[1
]}

Yasuda, Takuma ^{[2
,3
]}

机构：

[1] Ibaraki Univ, Dept Quantum Beam Sci, Grad Sch Sci & Engn, 4-12-1 Naka Narusawa, Hitachi, Ibaraki 3168511, Japan

[2] Kyushu Univ, INAMORI Frontier Res Ctr IFRC, Grad Sch Engn, Nishi Ku, 744 Motooka, Fukuoka 8190395, Japan

[3] Kyushu Univ, Dept Appl Chem, Grad Sch Engn, Nishi Ku, 744 Motooka, Fukuoka 8190395, Japan

[4] Kyoto Univ, Inst Chem Res, Uji, Kyoto 6110011, Japan

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2021年 / 60卷 / 37期

关键词：

narrowband emission; organic light-emitting diodes; organoboron; spin-orbit coupling; thermally activated delayed fluorescence; HIGH-EFFICIENCY; OPTICAL-PROPERTIES; DIODES;

D O I：

10.1002/anie.202108283

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Developing organic luminophores with unique capability of strong narrowband emission is both crucial and challenging for the further advancement of organic light-emitting diodes (OLEDs). Herein, a nanographitic fused-nonacyclic pi-system (BSBS-N1), which was strategically embedded with multiple boron, nitrogen, and sulfur atoms, was developed as a new multi-resonance thermally activated delayed fluorescence (MR-TADF) emitter. Narrowband sky-blue emission with a peak at 478 nm, full width at half maximum of 24 nm, and photoluminescence quantum yield of 89 % was obtained with BSBS-N1. Additionally, the spin-orbit coupling was enhanced by incorporating two sulfur atoms, thereby facilitating the spin-flipping process between the excited triplet and singlet states. OLEDs based on BSBS-N1 as a sky-blue MR-TADF emitter achieved a high maximum external electroluminescence quantum efficiency of 21.0 %, with improved efficiency roll-off.

引用

页码：20280 / 20285

页数：6