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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 8,
  • Issue 2,
  • pp. 221-223
  • (2010)

A new structure of multi-layer phosphor package of white LED with high efficiency

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Abstract

The applications of white light-emitting diodes (LEDs) have become more and more wide recently, while the low light-extraction eciency of white LED limits its development. In this letter, a new structure of multilayer phosphor package of white LED is proposed to improve the light-extraction efficiency. It is illustrated that the thickness of phosphor layer plays an important role in improving the light-extraction efficiency of LED. The light-extraction efficiency of LED is improved by double-layer or multi-layer phosphor package structures.

© 2010 Chinese Optics Letters

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