Journal
JOURNAL OF INFORMATION DISPLAY
Volume 24, Issue 1, Pages 71-79Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/15980316.2022.2127950
Keywords
Organic light-emitting diodes; light extraction; pyramid structure; porous surface; patterning
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This paper proposes the application of an optical property-enhancement film to TEOLEDs, which improves the uniformity of light distribution and reduces the variation in electroluminescence spectrum at different angles. Additionally, the reduction in total internal reflection in the film structure leads to a significant improvement in the external quantum efficiency and current efficiency.
In this paper, we propose the application of an optical property-enhancement film that complements the angular dependence and total reflection of top-emitting organic light-emitting diodes (TEOLEDs). The optical property-enhancement film is composed of a porous pyramid arrangement applied on a thin-film encapsulation layer of TEOLEDs and is applied to distribute the transmitted light evenly. The results confirm that the change in the electroluminescence spectrum for each angle was effectively reduced because the TEOLEDs demonstrated uniform light distribution. In addition, reducing the total internal reflection in the film structure made it possible to improve the external quantum efficiency by approximately 35% and current efficiency by 38%.
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