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학술지 A Systematic Approach to Reducing Angular Color Shift in Cavity-based Organic Light-Emitting Diodes
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저자
김은혜, 정진, 이재호, 조현수, 조남성, 유승협
발행일
201706
출처
Organic Electronics, v.48, pp.348-356
ISSN
1566-1199
출판사
Elsevier
DOI
https://dx.doi.org/10.1016/j.orgel.2017.06.030
초록
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.
키워드
Microcavity effect, Organic light-emitting diode, Top-emitting OLEDs, White angular dependence (WAD)
KSP 제안 키워드
Microcavity effect, Multi-color, Organic light-emitting diodes(OLEDS), Threshold Value, Top-emitting OLEDs, Well-balanced, angular dependence, blue devices, color difference, high efficiency, light-emitting diode(LED)