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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 2 — Jan. 10, 2010
  • pp: 247–257

Measurement and numerical studies of optical properties of YAG:Ce phosphor for white light-emitting diode packaging

Zongyuan Liu, Sheng Liu, Kai Wang, and Xiaobing Luo  »View Author Affiliations


Applied Optics, Vol. 49, Issue 2, pp. 247-257 (2010)
http://dx.doi.org/10.1364/AO.49.000247


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Abstract

The optical properties of YAG:Ce phosphor were measured by a double-integrating-sphere system and calculated by Mie theory and Monte Carlo ray tracing to provide precise optical characterizations of YAG:Ce phosphor for white light-emitting diode (LED) packaging design. Measurement results showed that the phosphor presents strong absorption for blue light, high reflection for yellow light, and an isotropic emission pattern of converted light. The conversion efficiency and quantum efficiency for the saturated phosphor are around 70% and 87%, respectively. Based on the measurement results, the absorption coefficient, scattering coefficient, and anisotropy factor of the phosphor calculated by Mie theory were compared with those calculated by ray-tracing simulation to modify Mie theory to find a reasonable method that can easily obtain the optical constants of YAG:Ce phosphor. Comparisons revealed that Mie theory can predict the variation of the optical constants of phosphor, but the absorption and scattering cross sections should be multiplied with two fitting parameters. The fitting pa rameters have been given in this study and can be obtained by testing packaged LEDs with different phosphor concentrations.

© 2010 Optical Society of America

OCIS Codes
(120.4530) Instrumentation, measurement, and metrology : Optical constants
(160.2540) Materials : Fluorescent and luminescent materials
(230.3670) Optical devices : Light-emitting diodes
(290.4020) Scattering : Mie theory
(290.5820) Scattering : Scattering measurements
(290.5850) Scattering : Scattering, particles

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: July 13, 2009
Manuscript Accepted: November 15, 2009
Published: January 8, 2010

Citation
Zongyuan Liu, Sheng Liu, Kai Wang, and Xiaobing Luo, "Measurement and numerical studies of optical properties of YAG:Ce phosphor for white light-emitting diode packaging," Appl. Opt. 49, 247-257 (2010)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-49-2-247

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