Enhancement of efficiencies for tandem green phosphorescent organic light-emitting devices with a p-type charge generation layer
- Authors
- Yoo, Byung Soo; Jeon, Young Pyo; Lee, Dae Uk; Kim, Tae Whan
- Issue Date
- Oct-2014
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Organic compounds; Thin films; Luminescence; Optical properties; Electrical properties
- Citation
- MATERIALS RESEARCH BULLETIN, v.58, pp.141 - 144
- Indexed
- SCIE
SCOPUS
- Journal Title
- MATERIALS RESEARCH BULLETIN
- Volume
- 58
- Start Page
- 141
- End Page
- 144
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/158970
- DOI
- 10.1016/j.materresbull.2014.04.045
- ISSN
- 0025-5408
- Abstract
- Tandem green phosphorescent organic light-emitting devices with a 1,4,5,8,9,11-hexaazatriphenylene-hexacarbonitrile or a molybdenum trioxide charge generation layer were fabricated to enhance their efficiency. Current density voltage curves showed that the operating voltage of the tandem green phosphorescent organic light-emitting device with a 1,4,5,8,9,11-hexaazatriphenylene-hexacarbonitrile layer was improved by 3% over that of the corresponding organic light-emitting device with a molybdenum trioxide layer. The efficiency and the brightness of the tandem green phosphorescent organic light-emitting device were 13.9 cd/A and 26,540 cd/m(2), respectively. The current efficiency of the tandem green phosphorescent organic light-emitting device with a 1,4,5,8,9,11-hexaazatriphenylene-hexacarbonitrile layer was lower by 1.1 times compared to that of the corresponding organic light-emitting device with molybdenum trioxide layer due to the decreased charge generation and transport in the 1,4,5,8,9,11-hexaazatriphenylene-hexacarbonitrile layer resulting from triplet-triplet exciton annihilation.
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