Enhanced persistent luminescence of LiGa 5 O 8 :Cr 3+ near-infrared phosphors by codoping Sn 4+
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Enhanced persistent luminescence of LiGa5O8:Cr3+ near-infrared phosphors by codoping Sn4+ Weichao Huang1 · Xinyong Gong1 · Ruirui Cui1 · Xucheng Li1 · Liangrong Li1 · Xu Wang1 · Chaoyong Deng1 Received: 1 March 2018 / Accepted: 16 April 2018 © Springer Science+Business Media, LLC, part of Springer Nature 2018
Abstract The near-infrared (NIR) long persistent phosphors LiGa5O8:Cr3+ have attracted considerable attention owing to the potential applications in medical imaging. A series of novel LiGa5O8:Cr3+ phosphors with different Sn4+ concentrations were successfully prepared by a high temperature solid-state reaction. The influence of codoping Sn4+ on photoluminescence, long persistent luminescence and thermoluminescence properties were systematically investigated. The results showed the persistent luminescence performance of phosphors was significantly enhanced after the incorporation of Sn4+ ions. Thermoluminescence spectra indicated that the incorporation of Sn4+ contributes to the formation of defects and increase the traps density, thus improving the persistent luminescence properties of LiGa5O8:Cr3+ phosphors.
1 Introduction Long persistent phosphors are special optical materials that can absorb and store excitation energy and then slowly release the energy as light for an appreciable time after ceasing the excitation irradiation [1, 2]. In the last few years, near infrared (NIR) persistent phosphors have received considerable attention because of their potential application in medical imaging [3–17]. NIR light corresponded to the biological window has low optical scattering and absorption in tissues, and therefore can efficiently penetrate deep-tissues. Previously, Chermont et al. synthesized the Ca0.2Zn0.9Mg0.9Si2O6:Eu2+, Dy3+, Mn2+ persistent luminescent nanoparticles based on Mn2+ emission around 690 nm [18]. Recently, many transition metal chromium ion (Cr3+) activated persistent phosphors, such as Z nGa2O4:Cr3+, 3+ LiGa5O8:Cr , have been studied owing to possessing suitable NIR emission range for medical imaging [19–25]. Many researchers have focused on improving the persistent luminescent properties of ZnGa2O4:Cr3+. Codoping other ions such as Ge, Sn, Si or Bi have been carried out to enhance the afterglow performance of ZnGa2O4:Cr3+ [26–30]. Pan et al. have made a major breakthrough in the synthesis of a new type of C r3+ activated Z n3Ga2Ge2O10 phosphor with * Chaoyong Deng [email protected] 1
super-long afterglow [27]. Qiu research group developed Zn3Ga2SnO8:Cr3+ phosphor with long persistent luminescent over 300 h [28]. Codoping has been proven to be an effective route to realize the enhancement of afterglow intensity and duration of persistent phosphor. In 2013, Liu et al. first report a new L iGa5O8:Cr3+ long persistent phosphor, which exhibited NIR emission ranging from 650 to 850 nm with peaking at 716 nm [22]. However, the further research and the improvement of persistent luminescence on LiGa5O8:Cr3+ remains rather limited. Therefore, it is an important aspect t
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