Premium
Effects of synthesis methods and different concentrations of Eu 3+ ions on the emission properties of Sr 2 SiO 4 phosphors
Author(s) -
Fan Yu,
Chen ChinTa,
Yang ChengFu,
Cheng YungMao
Publication year - 2021
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.4028
Subject(s) - phosphor , photoluminescence , analytical chemistry (journal) , materials science , magnetic dipole transition , ion , emission spectrum , luminescence , photoluminescence excitation , quenching (fluorescence) , spectral line , electric dipole transition , dipole , chemistry , fluorescence , magnetic dipole , physics , optics , optoelectronics , organic chemistry , chromatography , astronomy
Sr 2‐x SiO 4 ‐xEu (x = 0.01, 0.02, 0.035, and 0.05) phosphors were synthesized at 1000–1,300°C for 2 h in two different processes, the solid‐state reaction (SSR) method and a two‐step (TS) method, and these results revealed three important findings. The secondary Sr 3 SiO 5 phase was observed in 1,300° C‐TS‐synthesized Sr 2‐x SiO 4 ‐xEu powder, but no raw materials or secondary phases were observed in the SSR‐prepared Sr 2‐x SiO 4 ‐xEu powders. The concentration quenching effect of Eu 3+ ions was really observed in TS‐prepared Sr 2‐x SiO 4 ‐xEu phosphors, which was not observed in SSR‐prepared Sr 2‐x SiO 4 ‐xEu phosphors. High emission intensity of charge transition state (CT) band was observed in the photoluminescence excitation spectra, for that the 265 and 393 nm were used as the excitation wavelengths of Sr 2‐x SiO 4 ‐xEu phosphors. Sr 2‐x SiO 4 ‐xEu phosphors under different synthesis processes and excitation wavelengths would have different main emission peaks in the photoluminescence emission spectra. In this study, we also well discussed and explored the relationships of photoluminescence properties with the dipole transitions (electric or magnetic) of Eu 3+ ions and the different coordination structures of Sr +2 ions.