Work

Comprehensive kinetic analysis of inverted S 1 – T 1 materials with a dynamic exciton model

Year: 2026

Type: article

Abstract: Thermally activated delayed fluorescence materials have attracted attention for organic light-emitting diodes owing to their high efficiency and stability. Accurate evaluation of the singlet–triplet energy gap (Δ E ST ), particularly in near-zero-gap systems, remains a key challenge. Here, we investigate the photophysical properties of HzTFEX 2 , a proposed inverted singlet–triplet (InvE ST ) emitter, using temperature- and solvent-dependent analyses based on a dynamic exciton model. The results show that InvE ST explains the emission decay profiles of HzTFEX 2 in the Marcus normal region. We demonstrate that conventional kinetic analyses are insufficient in the near-zero Δ E ST regime, highlighting the necessity of the dynamic exciton model.

Source: Applied Physics Express

DOI: 10.35848/1882-0786/ae3f74

Authors: Hyunje Jung, Youichi Tsuchiya, Changfeng Si, Shoma Sasaki, Zachary M. Hudson, Chihaya Adachi

Institutions: Kyushu University, University of British Columbia

Language: English

Topic: Organic Light-Emitting Diodes Research

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,365

Funder: Japan Society for the Promotion of Science