Abstract
We report a phenothiazinen-dimesitylarylborane thermally activated delayed fluorescence (TADF) molecule that exhibits high external quantum efficiency (EQE) in non-doped organic light-emitting diodes (OLEDs) at high luminescence. The non-doped device shows green electroluminescence with an emission peak of 540 nm and a maximum EQE of 19.66% obtained at a luminescence of ~170 cd m−2. The EQE is still as high as 17.31% at a high luminescence of 1,500 cd m−2 with small efficiency roll-off.
Highlights
Activated delayed fluorescence (TADF) materials are emerging as third-generation organic electroluminescence materials and are expected to replace Ir- or Pt-based phosphorescent complexes in practical application (Adachi, 2014; Reineke, 2014; Chen H.-W. et al, 2018)
PTZMes2B shows a high photoluminescence quantum yield (PLQY) of 65% in the neat film
A maximum external quantum efficiency (EQE) of 19.66% is obtained at a luminescence of 170 cd m−2 in the non-doped device
Summary
Activated delayed fluorescence (TADF) materials are emerging as third-generation organic electroluminescence materials and are expected to replace Ir- or Pt-based phosphorescent complexes in practical application (Adachi, 2014; Reineke, 2014; Chen H.-W. et al, 2018). In organic light-emitting diodes (OLEDs), the singlet/triplet exciton branching ratio upon electrical excitation is generally believed to be 1:3 according to spin statistics. Phosphorescent materials can make the triplet state emissive via strong spin-orbit coupling caused by heavy metal atoms and are widely applied in full-color displays and white lightings (Zhang et al, 2015; Liu et al, 2016; Guo et al, 2017a; Miao et al, 2018a,b). Only the 25% singlet excitons can be emissive and the 75% triplet excitons are deactivated via thermal motion.
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