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Title: Color stable white phosphorescent organic light emitting diodes with red emissive electron transport layer

We analyzed the performance of multi-emissive white phosphorescent organic light-emitting diodes (PHOLEDs) in relation to various red emitting sites of hole and electron transport layers (HTL and ETL). The shift of the recombination zone producing stable white emission in PHOLEDs was utilized as luminance was increased with red emission in its electron transport layer. Multi-emissive white PHOLEDs including the red light emitting electron transport layer yielded maximum external quantum efficiency of 17.4% with CIE color coordinates (−0.030, +0.001) shifting only from 1000 to 10 000 cd/m{sup 2}. Additionally, we observed a reduction of energy loss in the white PHOLED via Ir(piq){sub 3} as phosphorescent red dopant in electron transport layer.
Authors:
; ;  [1] ; ;  [2] ; ;  [3] ;  [1] ;  [4]
  1. Department of Green Energy & Semiconductor Engineering, Hoseo University, Asan 336-795 (Korea, Republic of)
  2. Department of Information Display, Hongik University, Seoul 121-791 (Korea, Republic of)
  3. Department of Engineering Physics, McMaster University, Hamilton, Ontario L8S 4L7 (Canada)
  4. (Canada)
Publication Date:
OSTI Identifier:
22490743
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 24; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COLOR; EMISSION; ENERGY LOSSES; HOLES; LAYERS; LIGHT EMITTING DIODES; PERFORMANCE; QUANTUM EFFICIENCY; RECOMBINATION; VISIBLE RADIATION