Citation: Guoxi Yang, Hongji Tan, Jieji Zhu, Qingxiao Tong, Jingxin Jian, Zhihai Yang, Deli Li, Denghui Liu, Shijian Su. [1,2,4]Triazolo[1,5-a]pyridine as regulating unit with high horizontal orientation for efficient non-doped blue OLEDs with negligible efficiency roll-off[J]. Chinese Chemical Letters, ;2025, 36(8): 111138. doi: 10.1016/j.cclet.2025.111138 shu

[1,2,4]Triazolo[1,5-a]pyridine as regulating unit with high horizontal orientation for efficient non-doped blue OLEDs with negligible efficiency roll-off

Guoxi Yang ^{a, b, 1} ,
Hongji Tan ^{b, c, 1} ,
Jieji Zhu ^b ,
Qingxiao Tong ^{b, *,} ,
Jingxin Jian ^b ,
Zhihai Yang ^a ,
Deli Li ^a ,
Denghui Liu ^a ,
Shijian Su ^{a, *,}

a.
Institute of Polymer Optoelectronic Materials and Devices, Guangdong Basic Research Center of Excellence for Energy & information Polymer Materials, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China
b.
Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Material of Guangdong Province, Shantou University, Shantou 515063, China
c.
Center of Super-Diamond and Advanced Films (COSDAF) and Department of Chemistry, City University of Hong Kong, Hong Kong SAR, China

qxtong@stu.edu.cn

mssjsu@scut.edu.cn

Received Date: 11 December 2024
Revised Date: 19 March 2025
Accepted Date: 23 March 2025
Available Online: 24 March 2025

Figures(4)

Abundant efforts have been devoted to improving the efficiency of organic light-emitting diodes (OLEDs), however, approaches to control the device efficiency roll-off are still extremely limited, especially in non-doped blue OLEDs. In this work, three blue emitters (TAT, TAMT and TAMT-CN) with "hot exciton" properties are designed and synthesized based on [1,2,4]triazolo[1,5-a]pyridine (TP) as a regulating unit as well as anthracene-triphenylamine (An-TPA) as the chromophore. By adjusting the linkage mode and modifying the TP unit, the excited state properties, carrier transfer abilities, horizontal orientation, and device efficiency roll-off were precisely controlled. Among these materials, emitters that directly connect the fused TP unit exhibit balanced charge-transporting ability, higher photoluminescent quantum yield and improved horizontal orientation, resulting in better electroluminescence (EL) performance in non-doped blue OLEDs. As a result, non-doped blue OLEDs exhibit excellent performance with external quantum efficiencies of over 6%, brightness of over 30,000 cd/m² and EL peaks of around 476 nm. More importantly, the device based on TAMT-CN exhibits an ultra-low efficiency roll-off of 2.97% at a high brightness of 10,000 cd/m². The accessible molecular unit and feasible design strategy in this work are of great significance for designing highly efficient and ultra-low efficiency roll-off non-doped blue OLEDs.
- Blue OLED,
- [1,2,4]Triazolo[1,5-a]pyridine,
- Negligible efficiency roll-off,
- Hot exciton
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