Temperature dependence of operational stability of organic light emitting diodes based on mixed emitter layers

Vamvounis, George, Aziz, Hany, Hu, Nan-Xing, and Popovic, Zoran D. (2003) Temperature dependence of operational stability of organic light emitting diodes based on mixed emitter layers. Synthetic Metals, 143 (1). pp. 69-73.

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Abstract

Temperature dependence of electroluminescence degradation is Studied in organic light emitting diodes (OLEDs) containing an emitting layer composed of a mixture of tris(8-hydroxyquinoline)aluminum (AlQ(3)) electron transport and emitter material and four different hole transport materials (HTMs) (N,N'-di(naphthalene-1-yl)-N,N'-diphenyl-benzidine) (NPB), N,N'-diphenyl-N,N'-bis(3-methylphenyl)(1,1'-biphenyl)-4,4'-diamine (TPD), 1,1'-bis[(di-4-tolylamino)phenyl]cyclohexane (TAPC) or 4,4',4"-tris[3-methylphenyl(phenyl)amino]tri-phenylamine (MTDATA). The emitting layer is sandwiched between hole and electron transport layers. Activation energy of device degradation was determined from operational stability measurements for devices with different HTMs operated at various temperatures. It was found that the device lifetime correlates with the difference in HOMO energy level between AlQ(3) and the HTM, where greater energy differences lead to longer device lifetimes.

Item ID: 32727
Item Type: Article (Research - C1)
ISSN: 0379-6779
Keywords: AlQ(3), degradation, organic light emitting diode, OLED, stability, temperature
Funders: Natural Sciences and Engineering Research Council of Canada
Date Deposited: 14 Oct 2015 02:51
FoR Codes: 03 CHEMICAL SCIENCES > 0305 Organic Chemistry > 030599 Organic Chemistry not elsewhere classified @ 25%
03 CHEMICAL SCIENCES > 0305 Organic Chemistry > 030505 Physical Organic Chemistry @ 75%
SEO Codes: 85 ENERGY > 8507 Energy Conservation and Efficiency > 850704 Residential Energy Conservation and Efficiency @ 100%
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