The luminescent properties and crystal structure of Sr(1.5‐x)‐(1.5y)Mg0.5SiO4:xEu2+,yCe3+ blue phosphor synthesized by co‐precipitation method

In order to improve the luminescent performance of silicate blue phosphors, Sr(1.5‐x)‐(1.5y)Mg0.5SiO4:xEu2+,yCe3+ phosphors were synthesized using one‐step calcination of a precursor prepared by chemical co‐precipitation. The crystal structure and luminescent properties of the phosphors were analyze...

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Bibliographic Details
Published in:Luminescence (Chichester, England) England), 2017-06, Vol.32 (4), p.612-617
Main Authors: Wang, Jin shan, Zhu, Da‐chuan, Zhao, Cong, Han, Tao, Liu, ShaSha
Format: Article
Language:English
Subjects:
Cerium
Chemical synthesis
Chromaticity
concentration quenching
Coprecipitation
Crystal structure
Doping
Efficiency
Emission
emission intensity
Emissions
Energy
energy transfer
Europium
Excitation spectra
Fluorescence
Ions
Light emitting diodes
Optical properties
Phosphors
Precipitation
Properties
Quantum efficiency
Silicates
Spectrophotometry
Sr(1.5‐x)‐(1.5y)MgSiO4:xEu2+,yCe3
Wavelength
White light
X-ray diffraction
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Summary:In order to improve the luminescent performance of silicate blue phosphors, Sr(1.5‐x)‐(1.5y)Mg0.5SiO4:xEu2+,yCe3+ phosphors were synthesized using one‐step calcination of a precursor prepared by chemical co‐precipitation. The crystal structure and luminescent properties of the phosphors were analyzed using X‐ray diffraction and fluorescence spectrophotometry, respectively. Because the activated ions (Eu2+) can occupy two different types of sites (Sr1 and Sr2), the emission spectrum of Eu2+ excited at 350 nm contains two single bands (EM1 and EM2) in the wavelength range 400–550 nm, centered at 463 nm, and the emission intensity first increases and then decreases with increasing concentrations of Eu2+ ions. Co‐doping of Ce3+ ions can greatly enhance the emission intensity of Eu2+ by transferring its excitation energy to Eu2+. Because of concentration quenching, a higher substitution concentration of Ce3+ can lead to a decrease in the intensity. Meanwhile, the quantum efficiency of the phosphor is improved after doping with Ce3+, and a blue shift phenomenon is observed in the CIE chromaticity diagram. The results indicate that Sr(1.5‐x)‐(1.5y)Mg0.5SiO4:xEu2+,yCe3+ can be used as a potential new blue phosphor for white light‐emitting diodes.
ISSN:1522-7235
1522-7243
DOI:10.1002/bio.3228