Highly phosphorescent (Ph₄ P)₂ [MnBr₄ ] as a low-cost and environmentally benign emitting material achieves peak current efficiency of 25.4 cd A⁻¹ and external quantum efficiency (EQE) of 7.2% for nondoped organic light-emitting diodes, and peak current efficiency of 32.0 cd A⁻¹ and EQE of 9.6% for doped devices with 20% (Ph₄ P)₂ [MnBr₄ ]:27% TCTA:53% 6DCZPPY as a doping emitting layer.
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Xu et al. (2016) studied this question.
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