Evaluation of photooxidation stability of thermally activated delayed fluorescent dopants through accelerated photooxidation test.
발표자
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초록
내용
Thermally activated delayed fluorescence materials have been studied a lot as OLED materials because they have high color purity and excellent fluorescence efficiency. In particular, the dopant with a DABNA-based molecular structure effectively separates HOMO and LUMO through multiple resonance effects, so it is a material with high color purity. To be used as an OLED light emitting material, the fluorescence lifetime must be long and stability against heat and light is required. In this study, the photooxidation stability of dopants was evaluated through a photooxidation acceleration test. By-products produced by photooxidation were confirmed by infrared spectroscopy and nuclear magnetic resonance, and fluorescence efficiency and color purity according to photooxidation were evaluated by measuring the quantum efficiency and full width at half maximum of the dopant using a fluorescence spectrometer. Photooxidation stability was evaluated through real-time analysis using ocean optics.