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http://dx.doi.org/10.4313/JKEM.2009.22.10.850

The Study of Dielectric Layer Design for Luminance Efficiency of White Organic Light Emitting Device  

Kim, Sang-Gi (전남대학교 전기공학과)
Jin, En Mei (전남대학교 전기공학과)
Gu, Hal-Bon (전남대학교 전기공학과)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.22, no.10, 2009 , pp. 850-853 More about this Journal
Abstract
We have optimized the device structure by using the dielectric layer such as anti-reflection thin film to improve the emitting efficiency of white organic light emitting device (WOLED). Basically, dielectric layer with anti-reflection characteristics can enhance the emitting efficiency of WOLED by compensating the refractive index of organic layer, ITO, and Glass. Here, WOLED was designed and optimized by Macleod simulator. The refractive index of 1.74 was calculated for Dielectric layer and was selected as $TiO_2$. The optimal thicknesses of $TiO_2$ and ITO were 119.3 and 166.6 nm, respectively, at the wavelength of 600 nm. The transmittance of ITO was measured with the thickness variation of dielectric layer and ITO in Organic layer/ITO/Dielectric layer structure. The transmittance of ITO was 95.17% and thicknesses of $TiO_2$ and ITO were 119.3 and 166.6 nm, respectively. This result, calculated and measured values were coincided.
Keywords
White organic light emitting device; Dielectric layer; Transmittance; ITO;
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