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Luminance Compensation in Top-emitting Organic Light-emitting Diodes with High Color Purity as Quantum Dots using Horizontal Dipole Orientation
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- Authors
- Hyunsu Cho, Chan-mo Kang, Byoung-Hwa Kwon, Sukyung Choi, Chul Woong Joo, Hyunkoo Lee
- Issue Date
- 2020-12
- Citation
- Organic Electronics, v.87, pp.1-7
- ISSN
- 1566-1199
- Publisher
- Elsevier
- Language
- English
- Type
- Journal Article
- 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.
- KSP Keywords
- Blue light-emitting, Dipole orientation, Full width at half maximum(FWHM), Light-emitting materials, Optical Design, PL spectrum, Wide Color Gamut, high color purity, horizontal dipole, light emitting diodes(LED), light-emitting structure