Investigation of Upconversion, downshifting and quantum -cutting behavior of Eu3+, Yb3+, Bi3+ co-doped LaNbO4 phosphor as a spectral conversion material

Methods and Applications in Fluorescence
A DwivediS B Rai

Abstract

This work presents the spectral conversion characteristics [upconversion (UC), downshifting (DS) and quantum-cutting (QC) optical processes] of Eu3+, Yb3+ and Bi3+ co-doped LaNbO4 phosphor samples synthesized by solid state reaction technique The crystal structure and the pure phase formation has been confirmed by X- ray diffraction (XRD) measurements. The surface morphology and particle size are studied by scanning electron microscopy (SEM). The rarely observed intense red UC emission from Eu3+ ion has been successfully obtained in Eu3+/Yb3+ co-doped LaNbO4 phosphor (on excitation with 980 nm) by optimizing the concentrations of Eu3+ and Yb3+ ions. The downshifting (DS) behavior has been studied by photoluminescence (PL) measurements on excitation with 265 nm wavelength from a Xe lamp source. A broad blue emission in the region 300-550 nm with its maximum ~415 nm due to charge transfer band (CTB) of the host and large number of sharp peaks due to f-f transitions of Eu3+ ion have been observed. The energy transfer has been observed from (NbO4)3- to Eu3+ ion and the fluorescence emission has been optimized by varying the concentration of Eu3+ ion. An intense red emission has also been observed corresponding to 5D0→7F2 transition...Continue Reading

References

Jun 23, 2011·Dalton Transactions : an International Journal of Inorganic Chemistry·Abdul Kareem ParchurRajesh Kumar Vatsa
Mar 24, 2012·Physical Chemistry Chemical Physics : PCCP·Wei ZhengXueyuan Chen
Oct 18, 2012·Chemical Society Reviews·Xiaoyong HuangXiaogang Liu
Feb 20, 2014·ACS Applied Materials & Interfaces·Haifeng LiChengyu Li
Sep 19, 2014·Dalton Transactions : an International Journal of Inorganic Chemistry·A DwivediS B Rai

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