A Solution-Processable Small-Molecule Host for Phosphorescent Organic Light-Emitting Devices

The phosphorescent organic light-emitting devices (OLEDs) consisting of the solution-processed four organic layers: hole injection layer, electron blocking layer, emissive layer, and electron injection layer were fabricated. The small-molecule host material used in the device, 3,3',6,6'-te...

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Bibliographic Details
Published in:Journal of Photopolymer Science and Technology 2016/06/21, Vol.29(2), pp.317-321
Main Authors: Chiba, Takayuki, Fukada, Arata, Igarashi, Masahiro, Hikichi, Tatsuya, Ohisa, Satoru, Pu, Yong-Jin, Kido, Junji
Format: Article
Language:English
Subjects:
Alcohol
Cesium
Devices
Diodes
Electrons
Ethanol
Organic light emitting diodes
organic light-emitting device
Phosphorescence
phosphorescent
Power efficiency
Quantum efficiency
solution-processed
Spin coating
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Summary:The phosphorescent organic light-emitting devices (OLEDs) consisting of the solution-processed four organic layers: hole injection layer, electron blocking layer, emissive layer, and electron injection layer were fabricated. The small-molecule host material used in the device, 3,3',6,6'-tetrakis(9-phenyl-9H-carbazol-3-yl)benzophenone (TCzBP), is insoluble in alcohol solvents such as methanol, ethanol, and 2-propanol. Therefore, alcohol soluble electron injection materials can be coated onto small-molecule TCzBP based-phosphorescent emissive layer from alcohol solution. Power efficiency of 22 lm/W and external quantum efficiency of 14.6% were achieved at 1000 cd/m2 with spin-coated cesium carbonate (Cs2CO3) as an electron injection layer.
ISSN:0914-9244
1349-6336
DOI:10.2494/photopolymer.29.317