Journal
JOURNAL OF ADVANCED CERAMICS
Volume 10, Issue 4, Pages 729-740Publisher
SPRINGER
DOI: 10.1007/s40145-021-0467-0
Keywords
three-layered composite phosphor; structure design; high color rendering; luminous efficacy
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Funding
- National Key R&D Program of China [2017YFB0310500]
- National Natural Science Foundation of China [61775226]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDA22010301]
- key research project of the frontier science of the Chinese Academy of Sciences [QYZDB-SSW-JSC022]
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The study demonstrates that a WLED designed with a three-layered phosphor structure of red+cyan+yellow emits neutral white light, achieves high luminous efficacy, and exhibits good color performance, making it a promising candidate for achieving high color rendering lighting.
A three-layered phosphor structure was designed and prepared by the spin coating of BaSi2N2O2:Eu (cyan-emitting) and (Sr,Ca)AlSiN3:Eu (red-emitting) phosphor films on the yellow-emitting Y3Al5O12:Ce (YAG:Ce) phosphor ceramic synthesized by the solid-state reaction under vacuum sintering. In order to achieve high color rendering lighting, the influence of the composition and structure of the three-layered phosphors on the optical, thermal, and electrical properties of the chip-on-board (COB) packaged white-light-emitting diodes (WLEDs) was studied systematically. The WLED with the structure of red+cyan+yellow (R+C+Y) three-layered phosphor generated neutral white light and had a luminous efficacy of 75 lm/W, the fidelity index (R-f) of 93, the gamut index (R-g) of 97, and the correlated color temperature (CCT) of 3852 K. Under the excitation of laser diode (LD), the layer-structured phosphor yielded the white light with a luminous efficacy of 120 lm/W, color rendering index (CRI) of 90, and CCT of 5988 K. The result indicates that the three-layered phosphor structure is a promising candidate to achieve high color rendering and high luminous efficacy lighting.
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