Spectroscopy and Luminescence Dynamics of Ce3+ and Sm3+ in LiYSiO4

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• 作者：Rui Shi ; Jinzhong Xu ; Guokui Liu ; Xuejie Zhang ; Weijie Zhou ; Fengjuan Pan ; Yan Huang ; Ye Tao ; Hongbin Liang
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：March 3, 2016
• 年：2016
• 卷：120
• 期：8
• 页码：4529-4537
• 全文大小：668K
• ISSN：1932-7455

文摘

The lithium yttrium silicate series of LiY_1–xLn_xSiO₄ exhibits superb chemical and optical properties, and with Ln = Ce³⁺, Sm³⁺, its spectroscopic characteristics and luminescence dynamics are investigated in the present work. Energy transfer and nonradiative relaxation dramatically influence the Ln³⁺ luminescence spectra and decay dynamics, especially in the Ce³⁺–Sm³⁺ codoped phosphors. It is shown that thermal-quenching of the blue Ce³⁺ luminescence is primarily due to thermal ionization in the 5d excited states rather than multiphonon relaxation, whereas cross-relaxation arising from electric dipole–dipole interaction between adjacent Sm³⁺ ions is the leading mechanism that quenches the red Sm³⁺ luminescence. In the codoped systems, Ce³⁺–Sm³⁺ energy transfer in competing with the thermal quenching enhance the emission from Sm³⁺. The combined influences of concentration quenching, thermal ionization, and energy transfer including cross-relaxation on the luminescence intensity of single-center and codoped phosphors are analyzed based on the theories of ion–ion and ion–lattice interactions.