期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 120, 期 8, 页码 4495-4503出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.5b10375
关键词
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资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF)
- Ministry of Education, Science, and Technology
- Strategic Key-Material Development under the Ministry of Knowledge Economy (MKE, Korea)
- Joint Research Project
- Korea Evaluation Institute of Industrial Technology (KEIT) [10044203] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2015H1A2A1033990] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
White-light-emitting Ca4-xF2Si2O7:xCe(3+) phosphor and violet-light emitting oxyfluoride Ca4F2Si2O7 host were synthesized by solid-state reaction. Ca4-xF2Si2O7:xCe(3+) has strong absorption in the near-UV region (370 nm) and shows a broad emission in the range of 390-600 nm centered at 475 nm. Under 315 rim excitation, a narrow blue emission was observed. The Ca4F2Si2O7 host synthesized under the same reduction conditions exhibited-violet emission due to the formation of anion-deficient nonstoichiorrietric Ca4F2-delta Si2O7+delta/2, species. The broad emission of Ca4F2Si2O7:xCe(3+) phosphor is attributed to Ce3+ occupying two crystallographic calcium sites available in the host. A white LED device was fabricated using Ca4F2Si2O7:Ce3+ without any additive phosphor, displaying excellent CIE chromaticity (0.29, 0.35) close to white emission with a color rendering index of 97. These exceptional optical properties of Ca4F2Si2O7:Ce3+ suggest the promising application of the single activator phosphor that could produce white light under near-UV-based LEDs.
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