Wavelength-Selective Phosphor Coating for Laser Lighting Devices

Tech ID: 31861 / UC Case 2019-961-0


Typical single-crystal phosphor-based laser lighting devices exhibit low efficiency. Current systems struggle to simultaneously maintain energy and cost savings in conjunction with an increased brightness during operation. Consequently, low efficiency devices require increased heating as well as more phosphor material to be used —resulting in more system maintenance and expense.


Researchers at the University of California, Santa Barbara have developed a process that allows for more efficient single-crystal phosphor-based laser lighting devices. A blue laser is passed through, and partially converted by a single-crystal phosphor in a transmission geometry. A coating is applied to the single-crystal phosphor such that the wavelength of the laser is minimally reflected and the wavelengths of the phosphor emission are maximally reflected. Initial testing shows a 25% increase in efficiency compared to other devices.


  • Increases device efficiency
  • Increases phosphor light projection
  • Reduces system heating
  • Reduces phosphor costs


  • Laser Diodes

Patent Status

Country Type Number Dated Case
Patent Cooperation Treaty Published Application WO2021007148 01/24/2021 2019-961


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  • Lheureux, Gillaume
  • Reilly, Caroline
  • Weisbuch, Claude C.

Other Information


phophor, laser diode, wavelength, transmission geometry

Categorized As