期刊
DALTON TRANSACTIONS
卷 43, 期 35, 页码 13370-13376出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4dt01306a
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资金
- National Natural Science Foundation of China [51002146, 51272242]
- Natural Science Foundation of Beijing [2132050]
- Program for New Century Excellent Talents in University of Ministry of Education of China [NCET-12-0950]
- Beijing Nova Program [Z131103000413047]
- Beijing Youth Excellent Talent Program [YETP0635]
- Funds of the State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University [KF201306]
- Fundamental Research Funds for the Central Universities [FRF-2014]
A kind of novel blue-emitting chloro-germanate phosphor Ca3GeO4Cl2:Eu2+ has been synthesized via a high temperature solid-state method. The crystal structure of the as-prepared phosphor was discussed from the viewpoint of the doping behaviors of the activators. The luminescence properties and thermal stability of Ca3GeO4Cl2:Eu2+ was investigated in detail. Ca3GeO4Cl2:Eu2+ phosphors exhibit a broad-band excitation band in the near ultra-violet region and a blue emission peak at 428 nm, which are both ascribed to the 4f-5d transitions of the Eu2+ ions. The optimum concentration of Eu2+ in the Ca3GeO4Cl2 phosphor was determined to be 3 mol%, and the concentration quenching mechanism was considered to be the dipole-dipole interaction with a critical distance of R-c = 22.11 angstrom. Thermal stability studies show that the photoluminescence intensity of the Ca3GeO4Cl2:Eu2+ phosphor at 150 degrees C was 77% of the initial value at room temperature. The activation energy, E, was calculated to be 0.163 eV suggesting good thermal stability. The variation in lifetime of Ca3GeO4Cl2:Eu2+ phosphor was also discussed to verify different luminescence centers in the lattice.
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