Photostimulated and Long Persistent Luminescence Properties from Different Crystallographic Sites of β‐Sr2SiO4: Eu2+, R3+ (R = Tm, Gd)

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Abstract
Sintered ceramics of β‐ Sr 2 SiO 4: Eu 2+, R 3+( R = Tm , Gd ) were prepared and their spectroscopic properties were evaluated. A large enhancement of green photostimulated luminescence (PSL) was observed from β‐ Sr 2 SiO 4: Eu 2+ codoping with Tm 3+ at a recognizable intensity level, and the most efficient PSL was obtained when the codoping concentration of Tm 3+ was 0.002. It was proved that the introduction of Tm 3+ created a large number of oxygen vacancies which serve as traps for electrons excited by UV irradiation. In addition, a distinguishable difference between the photoluminescence (PL) and PSL spectra of β‐ Sr 2 SiO 4: Eu 2+, Tm 3+ was observed, namely the PSL spectrum exhibits only a symmetric emission band peaked at about 540 nm while both 470 and 540 nm peaks were detected in the PL spectrum. It is safe to say that PSL only derives from one emission center of Eu 2 in the crystallographic Sr 2 sites, which could be ascribed to the different distribution of trap centers for two crystallographic Sr sites.
Funding Information
  • National Natural Science Foundation of China (11204113, 61308091)
  • Specialized Research Fund for the Doctoral Program of Higher Education of China (20115314120001)
  • Natural Science Foundation of Yunnan Province (2011FB022)
  • Natural Science Foundation of Kunming University of Science and Technology (KKSY201351036)

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