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http://dx.doi.org/10.4313/JKEM.2014.27.12.837

Improvement of Color Purity Using Hole Blocking Layer in Hybrid White OLED  

Kim, Nam-Kyu (Department of Nano Engineering, Dong-A University)
Shin, Hoon-Kyu (National Institute for Nanomaterials Technology, Pohang University of Science and Technology)
Kwon, Young-Soo (Department of Nano Engineering, Dong-A University)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.27, no.12, 2014 , pp. 837-840 More about this Journal
Abstract
Novel materials of $Zn(HPB)_2$ and Ir-complexes were respectively synthesized as blue or red emitting material. White Organic Light Emitting Diodes (OLED) were fabricated by using $Zn(HPB)_2$ for a blue emitting layer, Ir-complexes for a red emitting layer and $Alq_3$ for a green emitting layer. White OLED was fabricated by using double emitting layers of $Zn(HPB)_2$ and $Alq_3:Ir$-complexes, and hole blocking layer of BCP. We also varied the thickness of BCP. When the thickness of BCP layer was 5 nm, white emission was achieved. We obtained a maximum luminance of $3,500cd/m^2$. The CIE coordinates was (0.375, 0.331). From this study, we could propose that the hybrid structure is efficient in lighting application of white OLED by improvement of color purity.
Keywords
White OLED; Zn-complexes; Ir-complexes; Hole blocking layer; BCP; CIE; Color purity;
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