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Effect of acceptor ions concentration in lead phosphate glasses co-doped with Tb3+-Ln3+（Ln=Eu,Sm）for LED applications

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Journal of Rare Earths 2019年第11期37卷 1145-1151页

作者： Agata Gorny marta soltys Joanna Pisarska Wojciech A.Pisarski Institute of Chemistry University of Silesia

In this work,lead phosphate glasses doubly doped with Tb^3+and Ln^3+(Ln=Eu,Sm)ions were *** excitation and emission spectra of lanthanides ions were *** luminescent properties of lead phosphate glasses containing various concentrations of acceptor ions were *** is observed that luminescence bands corresponding to characteristic transitions of rare earth ions are present on emission spectra measured under direct excitation of Tb^3+.From the emission spectra,the Commission Internationale de I’Eclairage(CIE)chromaticity coordinates(x,y)were calculated in relation to potential application studied systems for white *** lifetimes were also determined based on decay measurements and discussed in *** general,the luminescence spectra and luminescence lifetimes depend on the relative concentrations of the optically active dopants.

关键词： Lead phosphate glasses Rare earth ions LED applications

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Optical properties of silica sol-gel materials singly- and doubly-doped with Eu^3＋and Gd^3＋ ions

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Journal of Rare Earths 2016年第8期34卷 786-795页

作者： Natalia Pawlik Barbara Szpikowska-Sroka marta soltys Wojciech A. Pisarski Institute of Chemistry University of Silesia 9 Szkolna Street 40-007 Katowice Poland

In present work, the optical and structural properties of silica sol-gel glasses and glass-ceramic materials singly- and dou- bly-doped with Eu3＋ and Gd3＋ ions were investigated. The optical properties of studied systems were determined based on absorption, excitation and emission spectra as well as luminescence decay analysis. Conducted studies clearly indicated a significant enhance- ment of visible emission originated from Eu3＋ ions as a result of changing the excitation mechanism, via Gd3＋Eu3＋ energy transfer. The luminescence intensity R-ratio was analyzed before and after heat-treatment process upon excitation at λex=393 nm and λex=273 nm. Moreover, the influence of excitation wavelength on luminescence decay time of the 5D0 excited state was also analyzed. The GdS＋-Eu3＋ energy transfer efficiencies for precursor and annealed samples were calculated based on luminescence lifetime of the 6p7/2 level of Gd3＋ ions. The X-ray diffraction measurements were conducted to verify the nature of obtained sol-gel materials. In re- sult, the formation of orthorhombic GdF3 nanocrystal phase dispersed in amorphous silica glass host was identified after annealing. Obtained results clearly indicated an incorporation of Eu3＋ activators into formed GdF3 nanocrystals. Thus, conducted heat-treatment process led to considerable changes in surrounding environment around Eu3＋ ions. Actually, it was found that en- ergy transfer phenomenon and heat-treatment process were responsible for significant improvement of Eu3＋ luminescence in stud- ied sol-gel samples.

关键词： nanocrystals sol-gel method luminescence rare earths

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