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Efficient Charge Balance of Green Organic Light Emitting Diodes Using Mixed Charge Transporting Materials as the Host
- Authors
- Yang, Hyung Jin; Lee, Ho Won; Lee, Seok Jae; Lee, Song Eun; Lee, Dong Hyung; Koo, Ja Ryong; Yoon, Jhin Yeong; Yoon, Seung Soo; Kim, Young Kwan
- Issue Date
- 13-Aug-2014
- Publisher
- TAYLOR & FRANCIS LTD
- Keywords
- energy transfer; charge balance; Organic light emitting diode; roll-off ratio; mixed host
- Citation
- MOLECULAR CRYSTALS AND LIQUID CRYSTALS, v.599, no.1, pp.145 - 152
- Journal Title
- MOLECULAR CRYSTALS AND LIQUID CRYSTALS
- Volume
- 599
- Number
- 1
- Start Page
- 145
- End Page
- 152
- ISSN
- 1542-1406
- Abstract
- The mixed layer for an emitting layer (EML) consists of two materials 4,4 ',4 ''-tris(N-carbazolyl)-triphenylamine (TCTA) and 1,3,5-tris(N-phenylbenzimidazole-2-yl)benzene (TPBi) without host material. A series of EML structures were fabricated with three types of single mixed layers (mixing ratio 2:1, 1:2) and double mixed layers (mixing ratio 2:1/1:2), and the EML of using double mixed layer was optimized. The maximum luminous efficiency (LE) and quantum efficiency (QE) were 62.07 cd/A, 18.92%, respectively. Moreover, the roll-off ratio of LE was 20.42% at 20,000 cd/m(2). Interestingly, this result shows the roll-off ratio was reduced roughly 50% compared to the reference device.
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Collections - College of Engineering > Department of Science > 1. Journal Articles
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Related Researcher
- Kim, Young Kwan
- Engineering (Applied Science)