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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 10 — Apr. 1, 2013
  • pp: 2075–2079

Color deviation controlling of phosphor conformal coating by advanced spray painting technology for white LEDs

Liang Yang, Simin Wang, Zhicheng Lv, and Sheng Liu  »View Author Affiliations


Applied Optics, Vol. 52, Issue 10, pp. 2075-2079 (2013)
http://dx.doi.org/10.1364/AO.52.002075


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Abstract

An advanced phosphor conformal coating technology is proposed, good correlated color temperature (CCT) and chromaticity uniformity samples are fabricated through phosphor spray painting technology. Spray painting technology is also suitable for phosphor conformal coating of whole LED wafers. The samples of different CCTs are obtained through controlling the phosphor film thickness in the range of 6–80 μm; CCT variation of samples can be controlled in the range of ±200K. The experimental Δuv reveals that the spray painting method can obtain a much smaller CCT variation (Δuv of 1.36e3) than the conventional dispensing method (Δuv of 11.86e-3) when the light is emitted at angles from 90° to +90°, and chromaticity area uniformity is also improved significantly.

© 2013 Optical Society of America

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(350.4600) Other areas of optics : Optical engineering

ToC Category:
Optical Devices

History
Original Manuscript: January 30, 2013
Revised Manuscript: March 2, 2013
Manuscript Accepted: March 3, 2013
Published: March 26, 2013

Citation
Liang Yang, Simin Wang, Zhicheng Lv, and Sheng Liu, "Color deviation controlling of phosphor conformal coating by advanced spray painting technology for white LEDs," Appl. Opt. 52, 2075-2079 (2013)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-52-10-2075


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References

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  2. Z. Y. Liu, S. Liu, K. Wang, and X. B. Luo, “Optical analysis of color distribution in white LEDs with various packaging methods,” IEEE Photon. Technol. Lett. 20, 2027–2029 (2008).
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