Strong Green PL Emission of Sol-Gel Derived Tb³⁺-Ce³⁺ Ions Co-Doped SiO₂ Matrix Nanocomposites

Abstract:

Tb-Ce ions co-doped SiO₂ matrix nanocomposites were prepared successfully by a modified sol-gel method. High resolution SEM shows that the dried sample (annealed at 120°C for 48 hours) was in a “magnetic-domain” like structure. When the sample was treated at high temperature (800°C for 3 hours), it really forms an amorphous glass state with average grain size of 49.8nm. Under the excitation of 257nm UV light, the very strong emission of green light are observed around 544nm (⁵D₄ - ⁷F₅). The possible mechanism of efficient energy transfer occurred in SiO₂:Ce³⁺-Tb³⁺ phosphor is from Ce³⁺ to Tb³⁺. Various mole ratio of Tb:Ce and their concentrations, different annealing temperature and time have significant influence on PL properties of Tb-Ce ions co-doped SiO₂ matrix nanocomposites.

• Periodical: Advanced Materials Research (Volumes 557-559)
• Pages: 689-694
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.557-559.689
• Online since: July 2012
• Authors: Yi Wang, Hong Zhang, Kun Zhang
• Keywords: Nanocomposite, Rare Earth Ions Co-Doped Phosphor, SiO₂ Matrix, Sol-Gel Method

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