期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 660, 期 -, 页码 437-445出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2015.11.109
关键词
Phosphors; Sol-gel; X-ray diffraction; Luminescence
资金
- National Research Foundation of Korea (NRF) - Korea government (MSIP) [2014-069441]
- UGC-SERO, Hyderabad, India [ETFAPNA039/FDP-Xl PLAN]
Various concentrations of Eu3+ ions activated oxyapatite structured Sr2Gd8(SiO4)(6)O-2 (SGSO:Eu3+) phosphors were prepared using a citrate sol-gel technique. The structural properties were analyzed by the X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). Morphological studies of these phosphors were carried out by the field-emission scanning electron microscopy (FE-SEM). The XRD patterns confirmed the hexagonal crystal form of oxyapatite structure with the space group of P6(3)/m after annealed at 1450 degrees C, which was also authenticated by the FTIR spectra. The FE-SEM image showed a typical rod-like morphology. The luminescent properties of the SGSO:Eu3+ phosphors were investigated with the help of photoluminescence (PL) and cathodoluminescence (CL) analyses. The PL excitation (PLE) spectra exhibited a charge transfer band in the higher energy region and intense excitation bands in the lower energy region. The main excitation bands in the ultraviolet (UV), near-UV and visible regions showed higher intensities as well as better full width at half maximum values as compared to the commercial Y2O3:Eu3+ phosphors. The PL spectra revealed a stronger emission band with a peak at 613 nm due to the forced electric-dipole transition of D-5(0) -> F-7(2) under different excitation wavelengths, but the SGSO:Eu3+ phosphors showed greater emission intensity more than 4 times when compared with the Y2O3:Eu3+ phosphors under 394 nm excitation. The CL spectra also showed luminescence behavior similar to the PL spectra. Due to the better PL and CL properties, the SGSO:Eu3+ phosphors are expected to have potential applications in solid-state lighting industry. (C) 2015 Elsevier B.V. All rights reserved.
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