Quinazoline-based thermally activated delayed fluorescence emitters for high-performance organic light-emitting diodes with external quantum efficiencies about 28%
Journal
Journal of Materials Chemistry C
Journal Volume
9
Journal Issue
37
Pages
12633-12641
Date Issued
2021
Author(s)
Abstract
Incorporating both preferential orientation of organic emitters in the emitting layer and high photoluminescence quantum yield (PLQY) is a challenging issue in the organic light-emitting diode (OLED) field. In this study, a green thermally activated delayed fluorescence (TADF) emitter 10-(4-(2-(3,5-di(pyridin-2-yl)phenyl)quinazolin-4-yl)phenyl)-10H-phenoxazine (2DPyPh-Qz) containing two 2-pyridyl groups to give both preferential emissive dipole orientation and high PLQY was developed based on a phenoxazine electron donor segment and a quinazoline electron acceptor segment. This new emitter has a higher horizontal dipole ratio of 79% and a higher PLQY of 96% compared to the reference emitter when doped in a host film. OLEDs fabricated with this emitter achieved good external quantum efficiency of ?28% and current efficiency of 89.9 cd A?1, which are competitive figures among quinazoline-based TADF emitters. ? The Royal Society of Chemistry 2021.
Subjects
Efficiency
Fluorescence
Quantum efficiency
Emitting layer
External quantum efficiency
Organic emitters
Performance
Phenoxazines
Photoluminescence quantum yields
Preferential orientation
Pyridyl groups
Quinazolines
Thermally activated delayed fluorescences
Organic light emitting diodes (OLED)
SDGs
Type
journal article