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.
Notes
School of Electrical Engineering and Computer Science, Inter‐university Semiconductor Research Center, Seoul National University, Seoul, Republic of Korea
School of Chemical and Biological Engineering, Intelligent Hybrids Research Center, Seoul National University, Republic of Korea
Unitech Co., Ltd., Ansan City, Gyeonggi‐do, Republic of Korea
Member, KIDS