White phosphorescent organic light-emitting diodes using double emissive layer with three dopants for color stability

Jin Wook Kim; Nam Ho Kim; Ju-AnYoon; Seung Il Yoo; Jin Sung Kang; Woo Young Kim

doi:doi:10.3788/col201412.102302

Chinese Optics Letters, 2014, 12 (10): 102302, Published Online: Sep. 28, 2014

White phosphorescent organic light-emitting diodes using double emissive layer with three dopants for color stability

论文大纲

Jin Wook Kim ^1,2Nam Ho Kim ^1,2 Ju-AnYoon ^1,2Seung Il Yoo ^1,2Jin Sung Kang ^1,2Woo Young Kim ^1,2

Author Affiliations

¹ Department of Green Energy &

² Semiconductor Engineering, Hoseo University, Asan, South Korea

300.2140 Emission 300.6170 Spectra 330.1690 Color 230.3670 Light-emitting diodes

Abstract

We fabricate white phosphorescent organic light-emitting diodes (PHOLEDs) with three dopants and double emissive layer (EML) to achieve color stability. The white PHOLEDs use FIrpic dopant for blue EML (B-EML), and Ir(ppy)3:Ir(piq)3 dopants for green:red EML (GR-EML) with N,N.'-dicarbazolyl-3, 5-benzene (mCP) as host material. Thicknesses of B-EML and GR-EML are adjusted to form a narrow recombination zone at two EML's interface and charge trapping happens in EML according to wide highest occupied molecular orbital and/or lowest unoccupied molecular orbital energy band gap of mCP and smaller energy band gap of dopants. The total thickness of both EMLs is fixed at 30 nm in the device structure of ITO (150 nm)/MoO3 (2 nm)/N,N'-diphenyl-N,N'-bis(l-naphthyl-phenyl)-(l,l'-biphenyl)-4, 4'-diamine (70?nm)/mCP:Firpic-8.0% (12?nm)/mCP:Ir(ppy)3-3.0%:Ir(piq)3-1.5% (18 nm)/2',2',2''-(1,3,5-benzinetriyl)-tris(1-phenyl-1-H-benzimidazole) (30 nm)/8-hydroxyquinolinolato-lithium (2 nm)/Al (120 nm). White PHOLED shows 18.25 cd/A of luminous efficiency and white color coordinates of (0.358 and 0.378) at 5000 cd/m2 and color stability with slight CIEXY change of (0.028 and 0.002) as increasing luminance from 1000 to 5000 cd/m2.

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Jin Wook Kim, Nam Ho Kim, Ju-AnYoon, Seung Il Yoo, Jin Sung Kang, Woo Young Kim. White phosphorescent organic light-emitting diodes using double emissive layer with three dopants for color stability[J]. Chinese Optics Letters, 2014, 12(10): 102302.

White phosphorescent organic light-emitting diodes using double emissive layer with three dopants for color stability

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