Comparative study on the effect of thermal annealing on polymer/small molecule blend and copolymer light-emitting devices

Parul Rungta; Volodymyr Tsyalkovsky; Yuriy P. Bandera; Michael Angelo-Anthony Daniele; Stephen H Foulger

doi:10.1117/12.842614

1 March 2010 Comparative study on the effect of thermal annealing on polymer/small molecule blend and copolymer light-emitting devices

Parul Rungta, Volodymyr Tsyalkovsky, Yuriy P. Bandera, Michael Angelo-Anthony Daniele, Stephen H Foulger

Author Affiliations +

Proceedings Volume 7599, Organic Photonic Materials and Devices XII; 75991R (2010) https://doi.org/10.1117/12.842614
Event: SPIE OPTO, 2010, San Francisco, California, United States

Abstract

The intrinsic deterioration in device performance of polymeric single layer OLEDs that were doped with a fluorescent emitter was studied. The specific focus was on the role that thermal aging, at sub-glass transition temperatures of the polymeric layer, has on the phase separation of the active layer. This was accomplished by the rational design of an oxadiazole-containing methylacrylate monomer that was energetically similar to the technologically important electron- transporting small molecule 2-biphenyl-4-yl-5-(4-tert-butylphenyl)-1,3,4- oxadiazole (tBu-PBD). This monomer was copolymerized with a carbazole containing hole-transporting monomer 2-(9H-carbazol-9-yl)ethyl 2-methylacrylate (CE) and the resulting copolymer was utilized as the active layer with coumarin 6. With coumarin 6, the devices exhibited a stable mean luminance of ca. 400 cd/m² with thermal aging at temperatures ranging from 23 °C to 130 °C, while a comparable poly(9-vinyl-9H-carbazole)/tBu-PBD blend device exhibited a drop from an initial mean luminance of 2500 cd/m² to 1.6 cd/m². The reduction in luminance and luminance efficiency for the blend system was attributed to phase separation in the blend.

Citation Download Citation

Parul Rungta, Volodymyr Tsyalkovsky, Yuriy P. Bandera, Michael Angelo-Anthony Daniele, and Stephen H Foulger "Comparative study on the effect of thermal annealing on polymer/small molecule blend and copolymer light-emitting devices", Proc. SPIE 7599, Organic Photonic Materials and Devices XII, 75991R (1 March 2010); https://doi.org/10.1117/12.842614

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KEYWORDS

Polymers

Glasses

Molecules

Thermal effects

Absorbance

Annealing

Electroluminescence

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