Abstract
We report a high performance orange organic light-emitting diode (OLED) where red and green phosphorescent dyes are doped in an exciplex forming co-host as separate red and green emitting layers (EMLs). The OLED shows a maximum external quantum efficiency (EQE) of 22.8%, a low roll-off of efficiency with an EQE of 19.6% at 10,000cd/m2, and good orange color with a CIE coordinate of (0.442, 0.529) and no color change from 1000 to 10,000cd/m2. The exciplex forming co-host system distributes the recombination zone all over the EMLs and reduces the triplet exciton quenching processes.
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