TY - JOUR
T1 - Investigation of Laser-Induced Luminescence Saturation in a Single-Crystal YAG:Ce Phosphor: Towards Unique Architecture, High Saturation Threshold, and High-Brightness Laser-Driven White Lighting
AU - Xu, Jian
AU - Thorseth, Anders
AU - Xu, Chao
AU - Krasnoshchoka, Anastasiia
AU - Rosendal, Mathias Berg
AU - Dam-Hansen, Carsten
AU - Du, Baoli
AU - Gong, Yuxuan
AU - Jensen, Ole Bjarlin
PY - 2019
Y1 - 2019
N2 - A significant obstacle in the development of phosphor-converted white-laser diodes (pc-wLDs) is associated with the laser-induced luminescence saturation of phosphors. YAG:Ce is a canonical yellow-emitting phosphor. However, there has been few systematic research of measurement and understanding of the luminescence saturation in YAG:Ce yet. Here, we analyze the luminescence saturation of a single-crystal YAG:Ce with a unique phosphor geometry. A novel characterization method, which enables the optical signals to be fully collected and analyzed, is introduced. The effects of both laser power and laser power density on the luminescence properties and colorimetric properties of the YAG:Ce are studied systematically. The results show that a single-crystal YAG:Ce has a high saturation threshold (over 360 W/mm2) so that only a very slight saturation behavior can be observed at a high power density. Furthermore, a pc-wLDs light source based on the combination of a single laser diode and a YAG:Ce phosphor exhibits remarkable efficiency and stability. Under the excitation of a 3.38 W blue laser (~100 W/mm2), the white light emission with the luminous flux of 465 lm, the luminous efficacy (LE) of 145 lm/W, and the correlated color temperature (CCT) of 4980 K can be achieved.
AB - A significant obstacle in the development of phosphor-converted white-laser diodes (pc-wLDs) is associated with the laser-induced luminescence saturation of phosphors. YAG:Ce is a canonical yellow-emitting phosphor. However, there has been few systematic research of measurement and understanding of the luminescence saturation in YAG:Ce yet. Here, we analyze the luminescence saturation of a single-crystal YAG:Ce with a unique phosphor geometry. A novel characterization method, which enables the optical signals to be fully collected and analyzed, is introduced. The effects of both laser power and laser power density on the luminescence properties and colorimetric properties of the YAG:Ce are studied systematically. The results show that a single-crystal YAG:Ce has a high saturation threshold (over 360 W/mm2) so that only a very slight saturation behavior can be observed at a high power density. Furthermore, a pc-wLDs light source based on the combination of a single laser diode and a YAG:Ce phosphor exhibits remarkable efficiency and stability. Under the excitation of a 3.38 W blue laser (~100 W/mm2), the white light emission with the luminous flux of 465 lm, the luminous efficacy (LE) of 145 lm/W, and the correlated color temperature (CCT) of 4980 K can be achieved.
KW - Luminescence saturation
KW - Laser lighting
KW - High-luminance
KW - Reflection mode
KW - YAG:Ce
U2 - 10.1016/j.jlumin.2019.04.027
DO - 10.1016/j.jlumin.2019.04.027
M3 - Journal article
SN - 0022-2313
VL - 212
SP - 279
EP - 285
JO - Journal of Luminescence
JF - Journal of Luminescence
ER -