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Structural and optical spectroscopy of LiNbO3:Tm nanocrystals embedded in a SiO2 glass matrix

机译:嵌入在SiO2玻璃基体中的LiNbO3:Tm纳米晶体的结构和光谱学

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摘要

Transparent SiO2:Li2O:Nb2O5 glass doped with Tm3+ has been prepared by the sol-gel method, and heattreated in air (HT) at temperatures between 500 and 800 degrees C. X-ray diffraction (XRD) patterns and Raman spectroscopy show SiO2 and LiNbO3 phases in samples HT above 650 degrees C, and a NbTmO4 phase for T > 750 degrees C. The XRD SEM analysis show increasing particle size and number with the increase of HT temperature. lntra-4f(12) transitions due to TM3+ ion dispersed in the matrix are observed in samples with T >650 degrees C. The luminescence is dominated by the (1)G(4) -> F-3(4) (similar to 650nm), D-1(2)-> F-3(3) (similar to 780nm), H-3(4)-> H-3(6)(similar to 800 nm), H-3(5)-> H-3(6) (similar to 1200 nm) and H-3(4)-> H-3(4) (similar to 1500 nm) transitions under resonant excitation to the ion levels.
机译:已经通过溶胶-凝胶法制备了掺有Tm3 +的透明SiO2:Li2O:Nb2O5玻璃,并在空气(HT)中于500至800摄氏度之间进行了热处理。高于650摄氏度的HT样品中的LiNbO3相,以及T> 750摄氏度的NbTmO4相。XRDSEM分析显示,随着HT温度的升高,粒径和数量增加。在T> 650摄氏度的样品中观察到因TM3 +离子分散在基质中而引起的Intra-4f(12)跃迁。发光主要由(1)G(4)-> F-3(4)(类似于650nm),D-1(2)-> F-3(3)(类似于780nm),H-3(4)-> H-3(6)(类似于800 nm),H-3(5) -> H-3(6)(类似于1200 nm)和H-3(4)-> H-3(4)(类似于1500 nm)在共振激发下跃迁到离子能级。

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