t-Butyl group-substituted triphenylamine-containing orange-red fluorescent emitters for organic light-emitting diodes
- Authors
- Lee, Kum Hee; Kim, Chi Sik; Kim, Young Kwan; Yoon, Seung Soo
- Issue Date
- 30-Mar-2012
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Organic light emitting diodes; Red fluorescence; t-Butyl group; Triphenylamine
- Citation
- THIN SOLID FILMS, v.520, no.11, pp.3946 - 3951
- Journal Title
- THIN SOLID FILMS
- Volume
- 520
- Number
- 11
- Start Page
- 3946
- End Page
- 3951
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/19001
- DOI
- 10.1016/j.tsf.2012.02.003
- ISSN
- 0040-6090
- Abstract
- Efficient orange-red fluorescent compounds, 4-(dicyanomethylene)-2-adamantyl-6-(4-(N-(4-tert-butylphenyl)-N-(3,5-di-tert-butylphenyl)amino)benzene)vinl-4H-pyran (DCATP) and 2,6-bis[4-(N-(4-tert-butylphenyl)-N-(3,5-di-tert-butylphenyl)amino)benzene]vinyl-4-(dicyanomethylene)-4H-pyran (BDCTP) containing the tert-butylated triphenylamine in donor moieties, were synthesized and characterized. In these red emitters, bulky groups, such as t-butyl group and adamantane were introduced to increase the steric hindrance between the red emitters. In particular, an efficient orange-red device containing the emitter DCATP as a dopant showed a luminous and power efficiency of 6.87 cd/A and 2.70 lm/W, respectively, at 20 mA/cm(2) with the CIE coordinates of (0.48, 0.50) at 7.0 V. In addition, an efficient red organic light-emitting diode using BDCTP as a dopant exhibited a luminous and power efficiency of 2.30 cd/A and 131 lm/W, respectively, at 20 mA/cm(2) and CIE coordinates of (0.61, 039). (c) 2012 Elsevier B.V. All rights reserved.
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