Influence of Triplet-Polaron Quenching on Exciton Dynamics and Efficiency in TADF-Based OLEDs

Yulin Lin^1*, Tzu-Ying Yen², Yi-Ting Lee², Tzung-Fang Guo¹

¹Department of Photonics, National Cheng Kung University, Tainan, Taiwan
²Department of Chemistry, Soochow University, Taipei, Taiwan

* Presenter:Yulin Lin, email:www.brucelin@gmail.com

Our findings clearly demonstrate that the triplet-polaron quenching (TPQ) process significantly influences fluorescence quenching in thermally activated delayed fluorescence (TADF)-based organic light-emitting diodes (OLEDs), as characterized by magneto-electroluminescence (MEL), magneto-conductance (MC), and transient electroluminescence (TREL) measurements. Specifically, fluorescence quenching via the TPQ process is dependent on doping concentrations, regions, and locations. These results indicate that the increased TPQ process is a primary factor responsible for the reduced external quantum efficiency (EQE) in TADF-based OLEDs. This study underscores the critical role of triplet exciton dynamics and energy losses in TADF-based OLEDs, contributing to performance improvements through optimized triplet excitons harvesting and enhanced emission efficiency.

Keywords: magnetic field effect, organic light-emitting diode, spintronics