Abstract
In this study, we demonstrated high-efficiency white phosphorescent organic light emitting diodes with stable spectra based on the mixed-host emission layer. By employing a mixed-host system consisting of the hole transport material (4, 4'-N, N' -dicarbazole) biphenyl and electron transport material 1, 3, 5-tris (2-N-pheylbenzimidazolyl) benzene in double emission layers, realizing warm white organic light-emitting diodes characterized by peak efficiencies of 47.24 cd A−1 and 39.12 lm W−1 with the Commission International de L’Eclairage coordinates variations from (0.428, 0.470) to (0.427, 0.471) when the luminance varies from 1000 to 10 000 cd m−2.
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