Journal
ORGANIC ELECTRONICS
Volume 15, Issue 11, Pages 3127-3136Publisher
ELSEVIER
DOI: 10.1016/j.orgel.2014.08.038
Keywords
Organic light-emitting diodes; Blue OLED; Phosphorescent emitter; Ir complex; Lifetime study
Funding
- Department of Energy (DOE) [DE-EE0003296]
- National Science Foundation (NSF) [1316969]
- NSF Graduate Research Fellowship Program [0935947]
- National Postdoctoral Science Foundation of China [2012M511797]
- Division Of Graduate Education
- Direct For Education and Human Resources [0935947] Funding Source: National Science Foundation
- Office Of The Director
- Office Of Internatl Science &Engineering [1316969] Funding Source: National Science Foundation
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A blue phosphorescent emitter based on tris[1-(2,6-diisopropylphenyl)-2-phenyl-1H-imidazole]iridium(III), Ir(iprpmi)(3), as the dopant and 3,3'-bis(N-carbazoly)biphenyl, mCBP, as the host have been evaluated in OLED devices. By optimizing the dopant concentration and the materials for the electron and hole-transport layers, external quantum efficiencies greater than 20% have been achieved. Improved device lifetimes over those using the classic light-blue dopant FIrpic have also been achieved. These improvements can be attributed to the control of the electron-hole recombination and emission regions within the emitter layer as well as the choice of material for the transport layers. (C) 2014 Elsevier B.V. All rights reserved.
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