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

Jian Xu, Anders Thorseth, Chao Xu, Anastasiia Krasnoshchoka, Mathias Berg Rosendal, Carsten Dam-Hansen, Baoli Du*, Yuxuan Gong, Ole Bjarlin Jensen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

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.
Original languageEnglish
JournalJournal of Luminescence
Volume212
Pages (from-to)279-285
ISSN0022-2313
DOIs
Publication statusPublished - 2019

Keywords

  • Luminescence saturation
  • Laser lighting
  • High-luminance
  • Reflection mode
  • YAG:Ce

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