Fluorescent white OLEDs with a high color‐rendering index using a silicon‐cored anthracene derivative as a blue host

Abstract Fluorescent white organic light‐emitting diodes showing high color‐rendering indices (CRIs) of up to 81 was demonstrated, with a silicon‐cored anthracene derivative (PATSPA) doped with DPAVBi utilized as the deep‐blue host and dye materials, and the commercial dyes rubrene and DCM2 utilized as the orange‐ and red‐light‐emitting dyes. The devices, consisting of three emissive layers, showed bright‐white‐light emission, but the ratio of the blue peak to the orange and red peaks changed with the current density and the thickness of the blue emissive layer. A high CRI was achieved with the use of a deep‐blue emitter doped in a novel host and by optimizing the blue‐layer thickness. The device with a blue‐layer thickness of 10 nm showed the Commission Internationale de l'Eclairage (CIE) color coordinate of (0.33, 0.35), a high CRI of 81, and a moderate external quantum efficiency of 2% at a current density of 2.5 mA/cm2.