Journal of Information Display

The Korean Infomation Display Society (한국정보디스플레이학회)
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Fluorescent White OLEDs with a High Color-rendering Index Using a Silicon-Cored Anthracene Derivative as a Blue Host

  • Kwak, Jeong-Hun (School of Electrical Engineering and Computer Science, Inter-university Semiconductor Research Center, Seoul National University) ;
  • Lyu, Yi-Yeol (Unitech Co., Ltd.) ;
  • Lee, Hyun-Koo (School of Electrical Engineering and Computer Science, Inter-university Semiconductor Research Center, Seoul National University) ;
  • Char, Kook-Heon (School of Chemical and Biological Engineering, Intelligent Hybrids Research Center, Seoul National University) ;
  • Lee, Chang-Hee (School of Electrical Engineering and Computer Science, Inter-university Semiconductor Research Center, Seoul National University)
  • Received : 2010.09.09
  • Accepted : 2010.09.20
  • Published : 2010.09.30
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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 $2.5\;mA/cm^2$.

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References

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