Realization of high-color-quality white-by-blue organic light-emitting diodes with yellow and red phosphor films
- Authors
- Lee, Song-eun; S.E.; Oh; J.H.; Baek; H.J.; Kim; S.; Do; Y.R.; Kim, Young-kwan; Y.K.
- Issue Date
- 2019
- Publisher
- Elsevier B.V.
- Keywords
- Blue fluorescent OLED; Color-conversion layer; Color-rendering index; Red, yellow phosphors; White devices
- Citation
- Journal of Luminescence, v.207, pp.195 - 200
- Journal Title
- Journal of Luminescence
- Volume
- 207
- Start Page
- 195
- End Page
- 200
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/12768
- DOI
- 10.1016/j.jlumin.2018.10.109
- ISSN
- 0022-2313
- Abstract
- In this study, we realized white-by-blue organic light-emitting diodes (OLED) combined with free-standing yellow (Y) and red (R) phosphor films (PFs) as color-converting materials. The process involves conventional blue OLEDs as a light source and Y and R PFs as the color-conversion layer (CCL) via a physically attached method. The CCL of the Y and R PFs is used according to the various concentrations applied and the color rendering thickness by control of the wavelength. Several types of white OLEDs (WOLEDs) from a Y PF with a blue OLED or R/Y PFs with a blue OLED are fabricated with a CCL to produce good color rendering index (CRI) values. Also, the color performance of the devices is stable. The CRI values of a WOLED with R/Y PFs were improved to nearly 90 and the correlated color temperatures (CCTs) ranged from cool white to neutral/warm white between 5260 K and 4100 K. Moreover, the color fidelity score (Rf) and color gamut score (Rg) values are in good agreement with the reference sources. © 2018
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