Efficient greenish-blue thermally activated delayed fluorescence Zn complex for organic light emitting devices

被引：1

作者：

Han, Chih-Pin ^{[1
]}

Hsu, Chao-Hsien ^{[1
]}

Chu, Ching-Yuan ^{[1
]}

Huang, Tzu-Hao ^{[2
]}

Yi, Chih-Lun ^{[1
]}

Wong, Ken-Tsung ^{[1
]}

Tan, Jake A. ^{[3
]}

Hung, Wen-Yi ^{[2
]}

Leung, Man-kit ^{[1
,4
]}

Chou, Pi-Tai ^{[1
]}

机构：

[1] Natl Taiwan Univ, Dept Chem, Taipei 10617, Taiwan

[2] Natl Taiwan Ocean Univ, Dept Optoelect & Mat Technol, Keelung 202301, Taiwan

[3] Univ Richmond, Gottwald Ctr Sci, Dept Chem, Richmond, VA 23173 USA

[4] Natl Taiwan Univ, Adv Res Ctr Green Mat Sci & Technol, Taipei 10617, Taiwan

来源：

ORGANIC ELECTRONICS | 2025年 / 138卷

关键词：

Thermally activated delayed fluorescence (TADF); Organic light emitting diode (OLED); Complex; Zinc; ZINC-COMPLEXES; SKY-BLUE; DIODES; LIGAND;

D O I：

10.1016/j.orgel.2024.107178

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A greenish-blue zinc complex Zn(PhOBz)-PXZ with enhanced thermally activated delayed fluorescence (TADF) properties has been prepared from Zn(OAc)(2) and 4PXZ2OHBz, a 2-(1H-benzimidazol-2-yl)phenol-based TADF ligand. The TADF phenomenon has been confirmed by time-resolved photoluminescence (TrPL) studies. The DFT calculations show spatially well-separated HOMO and LUMO in their ground states, along with a small energy splitting between the excited singlet (S-1) and triplet (T-1) states, in a good agreement with the TADF mechanism. Due to the high thermal stability of Zn(PhOBz)-PXZ, OLED devices can be fabricated by vacuum vapor deposition, and greenish-blue OLEDs with the maximum emission at 521 nm were successfully demonstrated. The maximum external quantum efficiency (EQE(max)) of 10.6 %, with Commission Internationale de l'Eclairage (CIE) coordinates of (0.28, 0.47) were recorded. Zinc TADF complexes have the advantages of cost-effectiveness, greater abundance of natural resources, environmentally friendly metals, making them potential replacements for future precious metal emitters.

引用

页数：8

共 47 条

[1] Nearly 100% internal phosphorescence efficiency in an organic light-emitting device [J].