Color converter based on transparent Ce:YAG ceramic by different package structure for high-power white LED
Ceramics International(2019)
摘要
Ce: GdYAG ceramics and CaAlSiN3: Eu2+ phosphor were fabricated by solid-state reaction. CaAlSiN3: Eu2+ phosphor films with different content were manufactured on Ce: YAG ceramic by the spin-coating method. The Ce: YAG ceramics doping with different Gd3+ content is labeled as Gd-doping structure. The red phosphor film placing Ce: YAG ceramic close to the chips is labeled as R–Y structure, similarly, the red phosphor film adjacent to the chips is named as Y-R structure. The main emission peak has redshift with Gd content increase. The PL spectra have a shift to the red region with the increasing of the red phosphor content in the R–Y structure and Y-R structure. As-prepared samples were further fixed on the substrate to manufacture the ceramic covered film (CCF)-based LEDs and ceramic-based LEDs. The color temperature can be regulated through the three structure. The luminous efficacy in the R–Y structure, Y-R structure, and Gd-doping structure is 89.16 lm/w, 86.8 lm/w, and 62.9 lm/w at about 3500K, respectively. The CRI in the R–Y structure, Y-R structure, and Gd-doping structure is 64.6,68.8, and 62.2 at about 3500K, respectively. The temperature in the R–Y structure, Y-R structure, and Gd-doping structure 83.3 °C, 81 °C, and 124.7 °C at about 3500K, respectively. The heat dissipation capability of R–Y structure and Y-R structure are superior to that of the Gd-doping structure. The result shows that the R–Y structure has the best luminous efficacy at a similar CCT which improved 41.7% comparing to the Gd-doping structure. The Y-R structure has the best CRI (improve 10.6% comparing to the Gd-doping structure) and heat dissipation capability (decreased 35.1% comparing to the Gd-doping structure) at a similar CCT. The way of Ce: YAG ceramic coated CaAlSiN3: Eu2+ phosphor will be a promising candidate to achieve warm white for high power LEDs.
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关键词
Ce,YAG ceramic,Phosphor film,High-power white LED
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