Abstract
We report on efficient solution‐processed phosphorescent white polymer light‐emitting diodes (WPLEDs) with tunable color‐correlated temperature (CCT) and color rendering index (CRI), through rationally controlling the composition of the emission layer (EML) based on a novel near‐infrared (NIR)‐emitting dinuclear cyclometalated platinum (II) complex (Pt‐1), a sky‐blue emitter iridium (III) bis[(4,6‐di‐fluorophenyl)‐pyridinato‐N,C2] (picolinate) (FIrpic), and a yellow emitter bis[2‐(thieno[3,2‐c]pyridin‐4‐yl)phenyl]iridium(III)(acetylaceton ato) (PO‐01). One of the best three‐color WPLEDs shows a CCT of 3246 K as well as an excellent high CRI of 87, which are greatly beneficial in reducing deep‐blue light damage and simultaneously meet the requirement for good color reproduction. Meanwhile, the relevant WPLED also achieves a maximum current efficiency of 12.1 cd/A, corresponding to external quantum efficiency of 10.6%. This work presents an effective approach through rational combination of sky‐blue, yellow, and NIR emitters towards high‐performance solution‐processable WPLEDs with a physiologically‐friendly CCT and a high CRI.
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