Abstract
Novel materials of <TEX>$Zn(HPB)_2$</TEX> and Ir-complexes were respectively synthesized as blue or red emitting material. White Organic Light Emitting Diodes (OLED) were fabricated by using <TEX>$Zn(HPB)_2$</TEX> for a blue emitting layer, Ir-complexes for a red emitting layer and <TEX>$Alq_3$</TEX> for a green emitting layer. White OLED was fabricated by using double emitting layers of <TEX>$Zn(HPB)_2$</TEX> and <TEX>$Alq_3:Ir$</TEX>-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 <TEX>$3,500cd/m^2$</TEX>. 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.
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