White organic light-emitting devices with tunable color emission fabricated utilizing exciplex formation at heterointerfaces including m-MDATA
- Authors
- Lee, Kwang Seop; Choo, Dong Chul; Kim, Tae Whan
- Issue Date
- May-2011
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- OLED; Exciplex; Emission color; Color stabilization; Color purity
- Citation
- THIN SOLID FILMS, v.519, no.15, pp.5257 - 5259
- Indexed
- SCIE
SCOPUS
- Journal Title
- THIN SOLID FILMS
- Volume
- 519
- Number
- 15
- Start Page
- 5257
- End Page
- 5259
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/168583
- DOI
- 10.1016/j.tsf.2011.01.171
- ISSN
- 0040-6090
- Abstract
- The electrical and the optical properties of organic light-emitting devices (OLEDs) fabricated utilizing a 4,4',4 ''-tris(2-methylphenyl-phenylamino)triphenylamine (m-MTDATA) were investigated to clarify the effect of exciplex on their color stabilization and color purity. The electrons combined with the holes at heterointerfaces between the m-MTDATA layer and the 9,10-di(2-naphthyl)anthracene (MADN) and the 4-(dicyanomethylene)-2-methyl-6-(p-dimethyl aminostyryl)-4H-pyran (DCM1) emitting layer (EML) resulted in the formation of the exciplex. The emission peak of the electroluminescence spectra for the OLEDs fabricated utilizing the m-MTDATA layer shifted to a lower energy side in comparison with that of the EML This was due to the interaction of the holes in the m-MTDATA layer and the electrons in the MADN EML Carriers in white OLEDs (WOLEDs) with exciplex emissions existed at the heterointerfaces between the m-MTDATA and the EML because the DCM1 EML was too thin to affect the EL peak related to the m-MTDATA layer. The Commission Internationale de l'Eclairage coordinates of WOLEDs at 9.5 V were (0.33, 0.36), and their maximum current efficiency at 46 mA/cm(2) was 2.03 cd/A.
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