Affiliation:
1. Jiangsu Normal University
2. Jiangsu Xiyi Advanced Materials Research Institute of Industrial Technology
3. Xuzhou Fuchang Electronic Technology Co., Ltd
4. Chinese Academy of Sciences
5. Shanghai Institute of Technology
Abstract
Lu3Al5O12: Ce3+ (LuAG: Ce3+) phosphor ceramics (PCs) with high quantum efficiency and excellent thermal stability are incredibly promising color converters for high-power white light emitting diodes (LEDs)/ laser diodes (LDs) lighting. However, the greenish emission of LuAG:Ce3+ PCs does not allow to reach white light emission upon pumping by a blue LED/ LD without an additional red luminescent material. In this work, a series of (Ce0.003Lu0.997)3(Mg
x
Al1−2xSi
x
)5O12 (LCMASG) (x = 0–0.15) PCs were fabricated by solid state reaction method. Impressively, the as-prepared PCs exhibited a distinct red-shift (513→538nm) and a 17% increase of the color index (CRI) of high-power white LED(58.4→70.4). Particularly, Ce: Lu(Mg, Al)2(Si, Al)3O12 PC with 15 at.% substitution concentration showed only 8% luminescent intensity loss at 150 °C and high internal quantum efficiency (IQE) of 82%, exhibiting desirable optical thermal stability. By combining with a 460 nm blue chip or a 455 nm laser source, white LED/LD devices based on the LCMASG PCs in a remote excitation mode were constructed. The optimized luminous efficiency of Ce: Lu(Mg, Al)2(Si, Al)3O12 PC with 15 at.% Mg2+/Si4+ doping up to 176.4 lm/W was obtained as the power density of the blue laser increased to 6.52 W/mm2. Also, a 4053K CCT of the warm white light emission was realized. Therefore, this work proves that the LCMASG PCs are promising to serve as color converters for high power LEDs/LDs lighting in the future.
Funder
National Key Research and Development Program of China
National Natural Science Foundation of China
Priority Academic Program Development of Jiangsu Higher Education Institutions
Natural Science Foundation of Jiangsu Province
Postgraduate Research & Practice Innovation Program of Jiangsu Province
International Science and Technology Cooperation Program of Jiangsu Province
Natural Science Foundation of the Jiangsu Higher Education Institutes of China
Special Project for Technology Innovation of Xuzhou City
Open Project of State Key Laboratory of Advanced Materials and Electronic Components
Subject
Atomic and Molecular Physics, and Optics
Cited by
3 articles.
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