Luminance compensation in top-emitting organic light-emitting diodes with high color purity as quantum dots using horizontal dipole orientation
- Authors
- Cho, Hyunsu; Kang, Chan-mo; Kwon, Byoung-Hwa; Choi, Sukyung; Joo, Chul Woong; Lee, Hyun Koo
- Issue Date
- Dec-2020
- Publisher
- Elsevier B.V.
- Keywords
- Color purity; Horizontal dipole orientation; Organic light-emitting diode; Quantum dot; Top-emitting
- Citation
- Organic Electronics, v.87
- Journal Title
- Organic Electronics
- Volume
- 87
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/996
- DOI
- 10.1016/j.orgel.2020.105945
- ISSN
- 1566-1199
1878-5530
- Abstract
- Organic light-emitting diodes (OLEDs) and quantum dots (QDs) are mainstream applications in large-sized displays. Owing to their narrow photoluminescence (PL), QDs offer a wide color gamut. Although OLEDs have a wider PL spectrum bandwidth than that of QDs, a high color purity can be obtained through an optical design of the top-emitting device. However, the luminance improvement from the strong cavity effect in a top-emitting geometry is not significant because of the wide PL spectrum. This insufficient luminance improvement can be compensated by applying organic light-emitting materials with horizontally oriented dipoles. Luminance compensation is color dependent. In a blue light-emitting structure, the luminance improvement by a narrow PL spectrum is more advantageous than by a horizontal dipole orientation. However, in green and red light-emitting structures, even if the full width at half maximum of the PL is about 20-nm-wide, luminance can be compensated using a horizontal dipole orientation while maintaining high color purity. © 2020 Elsevier B.V.
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