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Experimental and theoretical study of mechanoluminescence and lyoluminescence of Li3PO4: RE (RE=Dy and Tb) phosphors 下载免费PDF全文
A. K. Sahu Monali R. Kadukar P. S. Chowdhary V. Nayar S. J. Dhoble 《Luminescence》2014,29(8):1082-1094
Li3PO4 phosphors prepared by solid‐state diffusion technique and lyoluminescence (LL) as well as mechanoluminescence (ML) studies are reported. Dy‐ and Tb‐activated phosphors show dosimetric characteristics using LL and ML techniques. The energy levels and hence trapping and detrapping of charge carriers in the material can be studied using ML. Li3PO4 phosphor can be used in the dosimetric applications for ionizing radiation. By using the LL technique, the LL characteristics of Li3PO4 may be useful for high radiation doses. We also report a more detailed theoretical understanding of the mechanism of LL and ML. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
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Monali R.Kadukar S. J. Dhoble A. K. Sahu V. Nayar S. Sailaja B. Sudhakar Reddy 《Luminescence》2017,32(2):159-170
This article reports on the luminescence properties of rare earth (Dy3+ and Tm3+)ions doped SrGa2Si2O8 phosphor were studied. SrGa2Si2O8phosphors weresynthesizedby employing solid state reaction method.From the measured X‐ray diffraction (XRD) pattern of the samplemonoclinic phase structure has been observed. Thermoluminescenceand Mechanoluminescence properties of the γ‐ray irradiated samples have been studied. Photoluminescence spectra of Dy3+ activated SrGa2Si2O8phosphor has been measured with an excitation wavelength at 348 nm,and it shows two emission bands at 483 and 574 nm due to 4F9/2 → 6H15/2 and 4F9/2 → 6H13/2 transitions respectively. Whereas the photoluminescence spectra of Tm3+ activated SrGa2Si2O8 phosphor has been measured with an excitation wavelength at 359 nm and it exhibits two emission bands at 454 and 472 nm due to 1D2 → 3F4 and1G4 → 3H6 transitions respectively. In thermoluminescence study, γ‐irradiatedthermoluminescence glow curve of SrGa2Si2O8:Dy3+ phosphor shows two well defined peaks at 293 °C (peak1)and 170 °C (peak2) whereas thermoluminescence glow curve of SrGa2Si2O8:Tm3+ phosphor shows peaks at 292 °C (peak1) and 184 °C (peak2) indicating that two sets of traps are being activated within the particular temperature range and the trapping parameters associated with the prominent glow peaks of SrGa2Si2O8:Dy3+ and SrGa2Si2O8:Tm3+ are calculated using Chen's peak shape and initial rise method.From the Mechanoluminescence study, only one glow peak has been observed. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
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