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A Systematic Approach to Reducing Angular Color Shift in Cavity-based Organic Light-Emitting Diodes
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- Authors
- Eunhye Kim, Jin Chung, Jaeho Lee, Hyunsu Cho, Nam Sung Cho, Seunghyup Yoo
- Issue Date
- 2017-06
- Citation
- Organic Electronics, v.48, pp.348-356
- ISSN
- 1566-1199
- Publisher
- Elsevier
- Language
- English
- Type
- Journal Article
- Abstract
- The white angular dependence (WAD) is considered a serious problem in top emitting OLEDs (TOLEDs), both in monochrome and multi-color subpixel configurations. This work aims at providing a systematic strategy for obtaining WAD-free performance with little compromise in efficiency in TOLED-based multi-color displays. Starting with a slightly blue-detuned microcavity structure leading to low WAD per individual primary colors, we try to look for a condition where angular intensity drop rates are well balanced among the subpixels involved and yet the efficiency can be maintained within a certain threshold value. With the proposed protocol, red, green and blue TOLEDs are demonstrated that show a very low angular color shift of 2.4 ?쐉ust noticeable color difference?? (JNCD), 1.7 JNCD, and 1.4 JNCD for red, green, and blue devices themselves and 1.4 JNCD for a 1:1:1 mixture of red, green and blue. These devices are shown to exhibit not only low WAD but also high efficiency that is still within 70% of the maximum achievable values.