High-color-quality phosphorescent white organic light-emitting diodes utilizing broad-spectrum yellow emitters

Abstract

Lighting sources resembling sunlight with less blue hazards are desirable in today's world. Herein, we present a strategy for constructing low-energy white organic light-emitting diodes (WOLEDs) consisting of blue and yellow emissive layers (EMLs). Two new Pt (II) complexes, PtA-Y and PtB-Y, were developed as super broad-spectrum yellow emitters featuring dual-emission bands. The yellow OLEDs incorporating the broad-spectrum emitter were adjusted to fully cover the region from green to deep red with the full-width of half maximums over 150 nm. By adding the complementary blue EML, WOLEDs achieved a high color-rendering index of 95 at a correlated color temperature of 3767 K with less blue but more deep red emission, minimal color shift with the Commission Internationale de l’Elcairage coordinates shift CIE_(Δx,Δy) of (0.008, 0.001) in the luminance range of 178∼1168 cd m⁻², and long device operational half lifetimes over a hundred hours at 1000 cd m⁻². The strategy of constituting high-color-quality WOLEDs demonstrated here may assist the development of healthy lighting sources, feasibly having healing functions of flexible profile in the future.

Keywords

broad-spectrum emission / lighting / phosphorescence / WOLEDs / YOLEDs

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