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Materials 2017, 10(12), 1407; doi:10.3390/ma10121407

Investigation of Saturation Effects in Ceramic Phosphors for Laser Lighting

DTU Fotonik, Department of Photonics Engineering, Technical University of Denmark, 4000 Roskilde, Denmark
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Received: 31 October 2017 / Revised: 4 December 2017 / Accepted: 6 December 2017 / Published: 8 December 2017
(This article belongs to the Special Issue Light Emitting Diodes and Laser Diodes: Materials and Devices)
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Abstract

We report observations of saturation effects in a Ce:LuAG and Eu-doped nitride ceramic phosphor for conversion of blue laser light for white light generation. The luminous flux from the phosphors material increases linearly with the input power until saturation effects limit the conversion. It is shown that the temperature of the phosphor layer influences the saturation power level and the conversion efficiency. It is also shown that the correlated color temperature (CCT), phosphor conversion efficiency and color rendering index (CRI) are dependent both on the incident power and spot size diameter of the illumination. A phosphor conversion efficiency up to 140.8 lm/W with CRI of 89.4 was achieved. The saturation in a ceramic phosphor, when illuminated by high intensity laser diodes, is estimated to play the main role in limiting the available luminance from laser-based lighting systems. View Full-Text
Keywords: phosphor-converted; laser diode; Ce:LuAG and Eu-doped nitride; saturation phosphor-converted; laser diode; Ce:LuAG and Eu-doped nitride; saturation
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MDPI and ACS Style

Krasnoshchoka, A.; Thorseth, A.; Dam-Hansen, C.; Corell, D.D.; Petersen, P.M.; Jensen, O.B. Investigation of Saturation Effects in Ceramic Phosphors for Laser Lighting. Materials 2017, 10, 1407.

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