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

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

SUBMITTER: Liu J 

PROVIDER: S-EPMC6536661 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature