Luminescence spectra of doped and undoped lead tungstate crystals |
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| Authors: | V. Ramachandran XIQI Feng T. Kim M. Maghrabi P. D. Townsend |
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| Affiliation: | 1. EIT , University of Sussex , Pevensey Bldg, Brighton , BN1 9QH , UK;2. Laboratory of Functional Materials , Chinese Academy of Science , Shanghai , 200050 , P R China;3. Department of Science Education , Chonju National University of Education , Chonju , 560757 , Korea;4. Department of Physics , Hashemite University , PO box 150459, Zarqa , 13115 , Jordan |
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| Abstract: | TL spectra of undoped lead tungstate crystals exhibit glow peaks at 30 v K and 85 v K centred at 440 v nm, plus a peak at 50 v K at 530 v nm in an annealed sample. Annealing adds a 170 v K peak. Trivalent dopants of La 3+ and Y 3+ reduce the green luminescence, and Nb 5+ introduces a peak near 100 v K centred at 530 v nm; Sb introduces features between 40 v K and 90 v K and 150 and 180 v K. The luminescence emissions around 50 v K may be attributed to complex intrinsic defect centres, including (WO 4 ) m 3 . Of the four dopants studied in the present research, Sb +5 has the highest luminescence intensity. CL spectra show interesting anomalies near 170 v K which are linked to a phase change of water/ice nanoparticles trapped at dislocations. |
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| Keywords: | Luminescence Lead Tungstate Thermoluminescence |
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