Investigation of Saturation Effects in Ceramic Phosphors for Laser Lighting

作者：Anastasiia Krasnoshchoka, Anders Thorseth, Carsten Dam‐Hansen, Dennis Dan Corell, Paul Michael Petersen, Ole Bjarlin Jensen · 发表于：Materials · 年份：2017 · DOI：10.3390/ma10121407 · 被引用次数：49 · 研究领域：Luminescence Properties of Advanced Materials、GaN-based semiconductor devices and materials、Spectroscopy and Laser Applications

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.