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Pyrazine-Based Blue Thermally Activated Delayed Fluorescence Materials: Combine Small Singlet-Triplet Splitting With Large Fluorescence Rate

Pyrazine-Based Blue Thermally Activated Delayed Fluorescence Materials: Combine Small Singlet-Triplet Splitting With Large Fluorescence Rate

Junyuan Liu, Keren Zhou, Dan Wang, Chao Deng, Ke Duan, Qi Ai, Qisheng Zhang

Front Chem. 2019 May 21;7:312.

PMID: 31165054

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.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP37500951	3,6-Di-tert-butylcarbazole		37500-95-1	Price

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