Related Experiment Video
Updated: Jan 23, 2026

Scale-up Chemical Synthesis of Thermally-activated Delayed Fluorescence Emitters Based on the Dibenzothiophene-S,S-Dioxide Core
Published on: October 24, 2017
Pyrazine-Based Blue Thermally Activated Delayed Fluorescence Materials: Combine Small Singlet-Triplet Splitting With
Junyuan Liu1, Keren Zhou1, Dan Wang1
1MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, China.
Abstract:
Metal-free thermally activated delayed fluorescence (TADF) emitters have emerged as promising candidate materials for highly efficient and low-cost organic light-emitting diodes (OLEDs). Here, a novel acceptor 2-cyanopyrazine is selected for the construction of blue TADF molecules via computer-assisted molecular design. Both theoretical prediction and experimental photophysical data indicate a small S1-T1 energy gap (ΔE ST) and a relative large fluorescence rate (k F) in an o-phenylene-bridged 2-cyanopyrazine/3,6-di-tert-butylcarbazole compound (TCzPZCN). The k F value of 3.7 × 107 s-1 observed in a TCzPZCN doped film is among the highest in the TADF emitters with a ΔE ST smaller than 0.1 eV. Blue TADF emission is observed in a TCzPZCN doped film with a short TADF lifetime of 1.9 μs. The OLEDs using TCzPZCN as emitter exhibit a maximum external quantum efficiency (EQE) of 7.6% with low-efficiency roll-off. A sky-blue device containing a derivative of TCzPZCN achieves an improved EQE maximum of 12.2% by suppressing the non-radiative decay at T1.
Related Concept Videos
Cycloaddition Reactions: MO Requirements for Thermal Activation
Photoluminescence: Fluorescence and Phosphorescence
A pair of electrons in a...
Atomic Fluorescence Spectroscopy
Confocal Fluorescence Microscopy
Variables Affecting Phosphorescence and Fluorescence
Fluorescence and Phosphorescence: Instrumentation

