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We demonstrate highly efficient blue phosphorescence organic light‐emitting diodes (PHOLED) with irregular stepwise‐doping emitting layers (EMLs). High efficiency is realized by inserting a high‐doping EML between two relatively low‐doping EMLs. Peak luminous efficiency and power efficiency of 19.2 cd A−1 and 18.0 lm W−1 are achieved, while those of a continuous stepwise‐doping device are 9.8 cd A−1 and 8.6 lm W−1. The dramatic efficiency enhancement is mainly attributed to the high hole–electron recombination probability and suppressed triplet excitons quenching by fine tuning the doping concentrations in the EMLs.
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Liu et al. (2013) studied this question.
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