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A man walks through the desert leaving footsteps where green light emits from. J.‐J. Kim and co‐workers demonstrate on page 5684 such high EQEs achieved with a green fluorescent OLED where phosphorescent OLEDs have been considered to be very dominant. The authors address the challenging concept of taking advantage of an exciplex‐forming host doped with a fluorescent dye.
Almost 100% internal quantum efficiency (IQE) is achieved with a green fluorescent organic light‐emitting diode (OLED) exhibiting 30% external quantum efficiency (EQE). The OLED comprises an exciplex‐forming co‐host system doped with a fluorescent dye that has a strong delayed fluorescence as a result of reverse intersystem crossing (RISC); the exciplex‐forming co‐hosts stimulate energy transfer and...
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