• Acta Photonica Sinica
  • Vol. 47, Issue 8, 816001 (2018)
WANG Fei1、2、*
Author Affiliations
  • 1[in Chinese]
  • 2[in Chinese]
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    DOI: 10.3788/gzxb20184708.0816001 Cite this Article
    WANG Fei. Preparation and Luminescent Properties of Phosphor Sr2La8(SiO4)6O2∶Eu(2+,3+)[J]. Acta Photonica Sinica, 2018, 47(8): 816001 Copy Citation Text show less

    Abstract

    A series of luminescence phosphors Sr2La8(SiO4)6O2∶Eu(2+,3+)were prepared via solid-state reaction. The results of X-ray powder diffraction data analysis show that the fluorescent powder is apatite structure, belonging to the six square system, which has P63/m (176) space point group structure. The fluorescence spectra of the samples indicate that the excitation spectrum of Sr2La8(SiO4)6O2∶Eu (2+, 3+) is located at 200~600 nm, consisting of two broad peaks of 275 nm and 336 nm, as well as some other sharp peaks of 392 nm, 461 nm, 466 nm, 523 nm and so on. The two broadband excitation peaks can be fitted by three peaks of 272 nm, 300 nm and 336 nm, with a peak area ratio of 1: 0.52: 4.09. 272 nm and 300 nm belongs to the charge transport excited transition state of the Eu3+, and the 336 nm peak comes from the f-d transition of Eu2+. Under the excitation of 393 nm, the emission spectrum of Sr2La8(SiO4)6O2∶Eu(2+,3+) in 500 ~750 nm shows many sharp lines with the maximum peak at 613 nm, belonging to 5D0→7F1 of the electric dipole transition, and Eu3+ has occupied no inversion center of symmetry site. Eu3+ magnetic dipole transition from 5D0→7F1 peak is fitted by four peaks of 584.5 nm, 588.5 nm, 594 nm, 597 nm, showing that the Eu3+ into the host lattice occupy 4f (C3) and 6h (Cs) two case. The results of X-ray photoelectron spectroscopy analysis show that the ratio of Eu3+ and Eu2+ is close to 2∶1 in the sample. There is energy transfer between Eu2+ and Eu3+. The sample is irradiated with an ultraviolet lamp, showing a color of candlelight yellow, which has the value of application of LED.
    WANG Fei. Preparation and Luminescent Properties of Phosphor Sr2La8(SiO4)6O2∶Eu(2+,3+)[J]. Acta Photonica Sinica, 2018, 47(8): 816001
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