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Updated: May 21, 2025

Scale-up Chemical Synthesis of Thermally-activated Delayed Fluorescence Emitters Based on the Dibenzothiophene-S,S-Dioxide Core
Published on: October 24, 2017
Purely organic room-temperature phosphorescence sensitizers for highly efficient hyperfluorescence OLEDs
Jiajie Zeng1, Shaoxin Song1, Yan Fu1
1State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, Guangzhou 510640, China.
Abstract:
Multiresonance thermally activated delayed fluorescence (MR-TADF) emitters are promising candidates for organic light-emitting diodes (OLEDs) with high color quality. However, in most cases, noble metal-containing phosphors are required as sensitizers for MR-TADF emitters to improve their electroluminescence (EL) performances, which may lead to high cost and environmental pollution. Herein, an efficient purely organic room-temperature phosphorescence (RTP) material, 3,2-PIC-TXT, with fast phosphorescence radiation is developed. It not only exhibits impressive EL performances as an emitter with an outstanding external quantum efficiency (EQE) of 33.2%, higher than that of Ir(ppy)3 (25.2%), but also functions remarkably as a sensitizer for green MR-TADF emitters (BN2, tCzphB-Ph, and tCzphB-Fl). The hyperfluorescence OLEDs using 3,2-PIC-TXT as a sensitizer provide ultrahigh EQEs of 40.9 to 43.8%, superior to those based on an Ir(ppy)3 sensitizer (37.0 to 38.0%), along with superb color purity and excellent operational stability. These OLEDs are the best devices based on RTP materials reported so far.
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