Harvesting Triplet Excitons in High Mobility Emissive Organic Semiconductor for Efficiency Enhancement of Light‐Emitting Transistors

• DOI: 10.1002/adma.202208389
• Publication Date: 2023-01-14T03:14:36Z
• Authors: Can Gao; Atul Shukla; Haikuo Gao; Zhagen Miao; Yihan Zhang; Pu Wang; Guiwen Luo; Yi Zeng; Wallace W. H. Wong; Trevor A. Smith; Shih‐Chun Lo; Wenping Hu; Ebinazar B. Namdas; Huanli Dong
• Keywords: Organic semiconductor; Active layer; Charge carrier; Quantum Efficiency; Electron Mobility

Organic light-emitting transistors (OLETs), a kind of highly integrated and minimized optoelectronic device, demonstrate great potential applications in various fields. The construction high-performance OLETs requires the integration high charge carrier mobility, strong emission, triplet exciton utilization efficiency active layer. However, it remains significant long-term challenge, especially for single component layer OLETs. Herein, successful harvesting excitons mobility emissive molecule, 2,6-diphenylanthracene (DPA), through triplet-triplet annihilation process is demonstrated. By incorporating guest into DPA host system, an obvious increase photoluminescence along with results enhancement external quantum 7.2 times compared to non-doped devices. Moreover, well-tunable multi-color electroluminescence, white emission Commission Internationale del'Eclairage (0.31, 0.35), from also achieved by modulating doping concentration controlled energy transfer process. This work opens new avenue integrating efficient high-mobility organic semiconductors advancing their related functional device applications.