Efficiency enhancement mechanism in yellow organic light-emitting devices with multiple heterostructures acting as an emitting layer
- Authors
- Yoon, Young Bae; Choo, Dong Chul; Kim, Tae Whan; Lee, Hyun Koo; Kim, Jun Ho; Kim, Young Kwan
- Issue Date
- Feb-2007
- Publisher
- JAPAN SOC APPLIED PHYSICS
- Keywords
- OLEDs; multiple heterostructures; electrical properties; efficiency enhancement mechanism
- Citation
- JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, v.46, no.2, pp.654 - 656
- Journal Title
- JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS
- Volume
- 46
- Number
- 2
- Start Page
- 654
- End Page
- 656
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/23642
- DOI
- 10.1143/JJAP.46.654
- ISSN
- 0021-4922
- Abstract
- The electrical properties of organic light-emitting devices (OLEDs) with multiple heterostructures consisting of N,N'-bis-(1-naphthyl)-N,N'-diphenyl-1,1'-biphenyl-4.4'-diamine (NPB)/5,6,11,12-tetraphenylnaphthacene (rubrene) emitting layers were investigated. The efficiencies of the OLEDs were significantly affected by the number of heterostructures. Although the turn-on voltage of the OLEDs increases with increasing number of NPB/rubrene heterostructures owing to an increase in the number of trapped holes, the efficiency of the OLEDs increases with increasing driving voltage and increasing number of heterostructures. The efficiency enhancement mechanism in the OLEDs with multiple heterostructures is described on the basis of the electrical results.
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