School of Mechanical Engineering, Liaoning Shihua University
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DOI:
10.7502/j.issn.1674-3962.2016.05.10
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Abstract:
A coprecipitation reduction method for synthesizing Gd2O2S∶Pr3+ phosphors was developed, using Gd(NO3)3·6H2O, Pr6O11, HNO3, (NH4)2SO4 and NH3·H2O as the starting materials. The characterizations of the synthetic products were obtained by fourier transform infrared spectroscopy (FTIR), Xray diffraction (XRD), scanning electron microscopy (SEM), and photoluminescence (PL) spectroscopy. The results revealed that the as synthesized precursor has noncrystalline structure and could be transformed into single phase Gd2O2SO4 by calcining at 800 oC for 2 h in air. By calcining the Gd2O2SO4 at 800 oC for 1 h in argon and hydrogen mixed atmosphere, pure Gd2O2S phase can be synthesized and this phosphor particles are quasispherical in shape, serious aggregation and about 1 μm in size. PL spectra of the Gd2O2S∶Pr3+ phosphors under 303 nm ultraviolet light excitation show a green emission at 514 nm as the most prominent peak, which attributes to the 3P0-3H4 transition of Pr3+ ions. Moreover, the quenching concentration of Pr3+ ions is 1mol%.