Journal
JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 515, Issue -, Pages 98-105Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnoncrysol.2019.04.026
Keywords
Phosphor glass film; Sapphire substrate; High-power white lighting; Optical performances; Thermal stability
Funding
- National Natural Science Foundation of China [51805196, 51775219]
- China Postdoctoral Science Foundation [2018M630852]
- Basic Research Plan Program of Shenzhen City [JCYJ20160509100737182]
- Analytical and Testing Center of Huazhong University of Science and Technology
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Thermal stability and heat dissipation of color converter are the key roadblocks for high-power white light-emitting diodes (LEDs) and laser diodes (LDs). In this work, we fabricated an efficient and heat-conducting color converter based on phosphor-sapphire composite (PSC) for white LEDs/LDs, in which Y3Al5O12:Ce3+ or Y3Al5O12:Ce3+/CaAlSiN3:Eu2+ phosphor glass film was sintered on a sapphire substrate by using low-melting borosilicate glass. The Y3Al5O12:Ce3+ PSC-based white LEDs achieve a high luminous efficacy of 155 lm/W, and the Y3Al5O12:Ce3+/CaAlSiN3:Eu2+ PSC-based white LEDs exhibit a warm white light with a correlated color temperature of 3509 K and a color rendering index of 88.3. The chromaticity of PSC-based white LDs shifts from cool to warm white. Furthermore, the PSC achieves a high thermal conductivity of 20.8 W m(-1) K-1, which provides the effective heat transfer channels. The working temperature of PSC is reduced by 46 degrees C compared with that of phosphor-in-silicone.
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