Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan.
Department of Molecular Engineering, Kyoto University, Kyotodaigaku Katsura, Nishikyo-ku, Kyoto 615-8510, Japan.
Sci Rep. 2013 Dec 18;3:3541. doi: 10.1038/srep03541.
Transparent inorganic luminescent materials have attracted considerable scientific and industrial attention recently because of their high chemical durability and formability. However, photoluminescence dynamics of ns(2)-type ions in oxide glasses has not been well examined, even though they can exhibit high quantum efficiency. We report on the emission property of Sn(2+)-doped strontium borate glasses. Photoluminescence dynamics studies show that the peak energy of the emission spectrum changes with time because of site distribution of emission centre in glass. It is also found that the emission decay of the present glass consists of two processes: a faster S1-S0 transition and a slower T1-S0 relaxation, and also that the energy difference between T1 and S1 states was found to be much smaller than that of (Sn, Sr)B6O10 crystals. We emphasize that the narrow energy gap between the S1 and T1 states provides the glass phosphor a high quantum efficiency, comparable to commercial crystalline phosphors.
透明无机发光材料因其高化学稳定性和可成形性而引起了科学界和工业界的广泛关注。然而，尽管 ns(2)-型离子在氧化物玻璃中具有高光致发光效率，但它们的光致发光动力学性质仍未得到很好的研究。我们报告了掺锡硼酸锶玻璃的发光性质。荧光动力学研究表明，由于发光中心在玻璃中的位置分布，发射光谱的峰值能量随时间而变化。还发现，目前玻璃的发射衰减由两个过程组成：较快的 S1-S0 跃迁和较慢的 T1-S0 弛豫，并且 T1 和 S1 态之间的能量差比 (Sn, Sr)B6O10 晶体小得多。我们强调指出，S1 和 T1 态之间的窄能隙为玻璃荧光粉提供了高光量子效率，可与商用晶体荧光粉相媲美。
