13.2% EQE near-infrared TADF OLED with emission peak at 761 nm

被引：30

作者：

Tai, Jing-Wen ^{[1
]}

Tang, Yukun ^{[2
,3
]}

Zhang, Kai ^{[4
]}

Yang, Chen-Zong ^{[1
]}

Pan, Ze-Hui ^{[1
]}

Lin, Yu-Ching ^{[2
,3
]}

Shih, Yu-Wei ^{[2
,3
]}

Chen, Chia-Hsun ^{[5
]}

Chiu, Tien-Lung ^{[6
]}

Lee, Jiun-Haw ^{[7
,8
]}

Wang, Chuan-Kui ^{[4
]}

Wu, Chung-Chih ^{[2
,3
]}

Fan, Jian ^{[1
,9
]}

机构：

[1] Soochow Univ, Inst Funct Nano & Soft Mat FUNSOM, Jiangsu Key Lab Carbon Based Funct Mat & Devices, Suzhou 215123, Jiangsu, Peoples R China

[2] Natl Taiwan Univ, Dept Elect Engn, Grad Inst Elect Engn, Taipei 10617, Taiwan

[3] Natl Taiwan Univ, Grad Inst Photon & Optoelect, Taipei 10617, Taiwan

[4] Shandong Normal Univ, Sch Phys & Elect, Shandong Prov Key Lab Med Phys & Image Proc Techno, Jinan 250014, Peoples R China

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

[6] Yuan Ze Univ, Dept Elect Engn, Taoyuan, Taiwan

[7] Natl Taiwan Univ, Grad Inst Photon & Optoelectron, Taipei 10617, Taiwan

[8] Natl Taiwan Univ, Dept Elect Engn, Taipei 10617, Taiwan

[9] Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fuzhou 35002, Fujian, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2023年 / 452卷

基金：

中国国家自然科学基金;

关键词：

OLED; Near; -infrared; Thermally activated delayed fluorescence; Horizontal ratio; ACTIVATED DELAYED FLUORESCENCE; HIGHLY EFFICIENT;

D O I：

10.1016/j.cej.2022.139534

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Near infrared (NIR) emitters have attracted much attention due to their advanced application in biomedical sensing/imaging, and telecommunications. However, the development of efficient NIR thermally activated delayed fluorescence (TADF) emitters with the emission over 750 nm is still a challenge. Herein two Y-shaped NIR TADF molecules (Py-TPA and Py-CN-TPA) were introduced. The inclusion of pyridine unit in these two emitters not only extended the conjugated system but also increased the molecular aspect ratios, thereby leading to their high horizontal ratio of emitting dipole orientation (Theta//). In addition, the NIR emitter showed a low Huang-Rhys (HR) factor in thin film relative to that in solution, indicating a low non-radiative transition rate and a high photoluminescent quantum yield (PLQY). Consequently, TADF OLED based on Py-TPA demonstrated a record-high external quantum efficiency (EQE) of 22.2% at 726 nm, 16.3% at 747 nm, and 13.2% at 761 nm.

引用

页数：7