Time-resolved photoluminescence studies in Eu-doped SiO₂ - HfO₂ - ZnO glass-ceramic waveguides

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• 作者：Subhabrata Ghosh^a ; Sreeramulu Valligatla^b ; ^c ; ^d ; Anna Lukowiak^e ; Alessandro Chiasera^b ; Maurizio Ferrari^b ; ^f ; B.N. Shivakiran Bhaktha^a ; ^{kiranbhaktha@phy.iitkgp.ernet.in" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Glass-ceramics ; Waveguides ; Rare earth ; Time resolved PL
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：43
• 期：1
• 页码：1145-1149
• 全文大小：956 K

文摘

Fabrication of ZnO-HfO₂ hybrid nanocrystals embedded 70 SiO₂-(30−x) HfO₂-xZnO (x=0, 2, 5, 7 and 10 mol%) ternary glass-ceramic planar waveguides doped with 1 mol% Eu-ions, by sol-gel process and dip-coating technique has been reported. The effect of varying ZnO concentration on the growth and structural evolution of ZnO-HfO₂ hybrid nanocrystals were investigated using transmission electron microscopy and other spectroscopic tools. Time-resolved PL measurements were performed to estimate the PL emission lifetimes of Eu²⁺ and Eu³⁺, present in two different local environments in the ternary matrix, as a function of ZnO concentration. Eu³⁺ ions exhibit double exponential decay profile for the class="mathmlsrc">title="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0272884216318211&_mathId=si0003.gif&_user=111111111&_pii=S0272884216318211&_rdoc=1&_issn=02728842&md5=51eecfe03ed22cccec31ef45692c61d8">class="imgLazyJSB inlineImage" height="24" width="66" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0272884216318211-si0003.gif">class="mathContainer hidden">class="mathCode">${}^{5}D_0\to {}^{7}F_2$ emission, while the decay curves of Eu²⁺ ions are single exponential. The variations in the PL emission decay profiles are used as a probe to investigate the changes in the local environments of the rare-earth ions in the glass-ceramic waveguides.