title: White OLED in Hybrid Structure for Enhancing Color Purity.
abstract: We synthesized the red emission material, bis(1,4-bis(5-phenyloxazol-2-yl)phenyl) iridium(picolate) [Ir-complexes] and the blue emission material, bis (2-(2-hydroxyphenyl) benzoxazolate)zinc [Zn(HPB)2]. White Organic Light Emitting Diodes were fabricated by using Zn(HPB)2 for a blue emitting layer, Ir-complexes for a red emitting layer and a tris (8-hydroxy quinoline)aluminum [Alq3] for a green emitting layer. The important experimental results obtained, white OLED was fabricated by using double emitting layers of Zn(HPB)2 and Alq3:Ir-complexes, and hole blocking layer of 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline[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 5400 cd/m2 at a current density of 650 mA/cm2. The CIE coordinates was (0.339, 0.323) at voltage of 10 V.
authors.forename: Dong-Eun
authors.initials: DE
authors.lastname: Kim
authors.forename: Min-Jae
authors.initials: MJ
authors.lastname: Kang
authors.forename: Gwang-Ryeol
authors.initials: GR
authors.lastname: Park
authors.forename: Burm-Jong
authors.initials: BJ
authors.lastname: Lee
authors.forename: Young-Soo
authors.initials: YS
authors.lastname: Kwon
authors.forename: Hoon-Kyu
authors.initials: HK
authors.lastname: Shin