Luminescence spectra of Eu3+ ions and interstitial oxygen in PbWO4 crystal

✍ Scribed by Yanlin Huang; Kyoung Hyuk Jang; Kiwan Jang; Hyo Jin Seo

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 418 KB
• Volume: 403
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2007.08.014

✦ Synopsis

The site-selective excitation and emission spectroscopy, and luminescence decay have been investigated under a pulsed, tunable, narrowband dye laser of the 5 D 0 -7 F 0 region in the europium ions-doped lead tungstate PbWO 4 (PWO) in single crystal. In as-grown sample, the experimental results show that there is only one 7 F 0 -5 D 0 excitation transition indicating the only one Eu 3+ site in PbWO 4 lattices. The sequential annealing treatments were conducted to investigate the effects of oxygen components on the microstructure environments of Eu 3+ in the lattices. The site distribution of Eu 3+ was changed by the annealing in air atmosphere, which could create new sites in PWO lattices. Confirmation of interstitial oxygen and interpretations of charge compensation mechanism for the observed new sites were discussed in the context of site-selective excitation and emission spectra. The main Eu 3+ site is related to the charge compensation by the [(Eu Pb 3+ ) d -V 00 Pb -(Eu Pb 3+ ) d ] complex; the other minor new sites after annealing are originated from [(Eu Pb 3+ ) d -O 00 i -(Eu Pb 3+ ) d ] defects. Emission spectra excited by 355-laser and RT-Raman spectra were also measured.