OLEDs with enhanced high temperature operational stability

Popovic, Zoran D., Vamvounis, George, Aziz, Hany, and Hu, Nan-Xing (2003) OLEDs with enhanced high temperature operational stability. Proceedings of SPIE, 4800. pp. 87-92.

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Temperature dependence of electroluminescence degradation is studied in organic light emitting devices containing an emitting layer composed of a mixture of different hole transport molecules and tris(8-hydroxyquinoline)aluminum (AlQ(3)) electron transport and emitter molecule. The emitting layer is sandwiched between hole and electron transport layers. Devices containing the hole transport molecule N,N'-di(naphthalene-1-yl)-N,N'-diphenyl-benzidine (NPB), doped with quinacridone (DMQ) green emitter showed remarkable temperature stability. For these devices, a half-life of about 78,500 hours, 18,700 hours, and 8,600 hours can be projected for operating temperatures of 22degreesC, 700degreesC and 100degreesC, respectively, at an initial device luminance of 100 cd/m(2). Activation energies for device degradation were determined for devices with different hole transport molecules and it was found that devices with higher activation energy show better high temperature stability. These results are consistent with the recently proposed degradation mechanism based on the unstable cationic AlQ(3) species.

Item ID: 32716
Item Type: Article (Research - C1)
ISSN: 0277-786X
Date Deposited: 29 Feb 2016 00:41
FoR Codes: 03 CHEMICAL SCIENCES > 0305 Organic Chemistry > 030505 Physical Organic Chemistry @ 100%
SEO Codes: 85 ENERGY > 8507 Energy Conservation and Efficiency > 850704 Residential Energy Conservation and Efficiency @ 100%
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