Vertically-stacked LEDs with invariance of color Chromaticity
- Title
- Vertically-stacked LEDs with invariance of color Chromaticity
- Author
- Kwan-San Hui
- Keywords
- RGB LEDs; Vertically-stacked; Laser micromachining; White light emission
- Issue Date
- 2011-05
- Publisher
- Elsevier Science B.V., Amsterdam.
- Citation
- CURRENT APPLIED PHYSICS, Vol.11 No.3 [2011], 662-666
- Abstract
- This study investigated the variance of color chromaticity of a vertically-stacked LEDs device with respect to the viewing angles. The LED chips with truncated inverted pyramid geometry were fabricated by laser micromachining. The sidewalls of the truncated inverted pyramid LED chips were coated with a thin layer of highly reflective silver film. The red, green and blue truncated inverted pyramid LED chips were vertically-stacked to form the white LEDs with color tunable function. A well mix of colors from the polychromatic LED chips was achieved in the layout of the vertically-stacked LEDs without utilizing additional optics. Compared to the commercial RGB LEDs, the stacked LEDs device showed insignificant angular dependence of color chromaticity. A luminous efficacy of 33 lm/W was achieved without any optimization of the fabrication process.
- URI
- http://www.sciencedirect.com/science/article/pii/S1567173910003561?via%3Dihub
- ISSN
- 1567-1739
- DOI
- 10.1016/j.cap.2010.11.006
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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