Rapid Research Letter

Extracting phosphor-scattered photons to improve white LED efficiency

  1. N. Narendran,
  2. Y. Gu,
  3. J. P. Freyssinier-Nova,
  4. Y. Zhu

Article first published online: 6 APR 2005

DOI: 10.1002/pssa.200510015

Issue

physica status solidi (a)

physica status solidi (a)

Volume 202, Issue 6, pages R60–R62, May 2005

Additional Information

How to Cite

Narendran, N., Gu, Y., Freyssinier-Nova, J. P. and Zhu, Y. (2005), Extracting phosphor-scattered photons to improve white LED efficiency. physica status solidi (a), 202: R60–R62. doi: 10.1002/pssa.200510015

Author Information

  1. Lighting Research Center, Rensselaer Polytechnic Institute, 21 Union Street, Troy, New York 12180, USA

Publication History

  1. Issue published online: 6 APR 2005
  2. Article first published online: 6 APR 2005
  3. Manuscript Accepted: 31 MAR 2005
  4. Manuscript Received: 17 MAR 2005

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Keywords:

  • 42.72.Bj;
  • 85.60.Bt;
  • 85.60.Jb

Abstract

White light-emitting diode (LED) luminous efficacy must improve significantly if LEDs are to become useful for general lighting. Phosphors commonly used in white LEDs backscatter more than half of the down-converted light, of which a significant portion is eventually lost within the package, thus reducing the overall efficacy. This letter describes an experi-mental study that shows by placing the phosphor away from the die, the backscattered photons can be extracted and the ef-ficacy can be significantly increased. At low currents, the lu-minous efficacy exceeded 80 lm/W. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

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