Fluorescent White OLEDs with a High Color-rendering Index Using a Silicon-Cored Anthracene Derivative as a Blue Host

• Published in: Journal of Information Display Vol. 11; no. 3; pp. 123 - 127
• Main Authors: Kwak, Jeong-Hun, Lyu, Yi-Yeol, Lee, Hyun-Koo, Char, Kook-Heon, Lee, Chang-Hee
• Format: Journal Article
• Language: Korean
• Published: 2010
• Subjects: high color-rendering index; fluorescence; white-light-emitting diodes; anthracene derivative
• ISSN: 1598-0316; 2158-1606

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 $2.5\;mA/cm^2$.