Projects per year
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 language | English |
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Journal | Journal of Luminescence |
Volume | 212 |
Pages (from-to) | 279-285 |
ISSN | 0022-2313 |
DOIs | |
Publication status | Published - 2019 |
Keywords
- Luminescence saturation
- Laser lighting
- High-luminance
- Reflection mode
- YAG:Ce
Fingerprint Dive into the research topics of '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'. Together they form a unique fingerprint.
Projects
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SpotLASE: Energy Efficient Laser Enhancement of Stage Spotlights
Thorseth, A., Dam-Hansen, C., Lindén, J. & Jensen, O. B.
01/10/2017 → 01/10/2020
Project: Research
Activities
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High luminous flux laser lighting using single-crystal Ce:YAG phosphor
Ole Bjarlin Jensen (Speaker), Anastasiia Krasnoshchoka (Other), Anders Thorseth (Other), Carsten Dam-Hansen (Other) & Jian Xu (Other)
9 Oct 2019 → 10 Oct 2019Activity: Talks and presentations › Conference presentations
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PhD Defence by Anastasiia Krasnoshchoka Title: “DIODE LASER BASED LIGHTING”
Anastasiia Krasnoshchoka (Speaker) & Anders Thorseth (Other)
6 Sep 2019Activity: Talks and presentations › Guest lectures, external teaching and course activities at other universities