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Designed Synthesis And Luminescent Property Of Eu-doped Molybdates Phosphors

Posted on:2012-12-22Degree:MasterType:Thesis
Country:ChinaCandidate:F Y YuFull Text:PDF
GTID:2178330338992242Subject:Condensed matter physics
Abstract/Summary:PDF Full Text Request
The aim of this dissertation is to explore the preparation of Eu3+-doped molybdates phosphors by facile and low-cost method. Selecting different alkaline sources as additive, different morphologies doping target products with uniform micro- and nano-structures were obtained by via the facile hydrothermal method at low temperature. In addition, the doping samples were also prepared by Pechini method. By photoluminescence measurements and analyses, we carefully investigate the pathway of energy transfer and relevant factors which may affect energy transfer. The main research contents are summarized as follow:1. Selecting different alkalis as alkaline sources in surfactant-free environment, products with different morphologies were obtained by facile hydrothermal method under low temperature. We investigated the influences of pH value, concentration and reaction time on shapes, and we studied the formation mechanism of the products; the experimental products with different morphologies showed different luminescent properties, so we have analyzed and researched the relevant inducement factors. Final results show that cake-like CaMoO4:Eu3+ prepared by a facile hydrothermal method at 120 oC for 10 h using NH3·H2O as additive performs good photoluminescent properties.2. We obtained the Eu3+-doped MMoO4 (M = Ca,Sr) with uniform composition at the molecular level. We comparably studied the discrepancy and relationship between structures produced by Eu3+ doped into different sustrates; we investigated the energy transfer and concentration quenching effect through a series of doping and proposed possible factors which may affect luminescent performance. The experiments showed that Eu3+-doped CaMoO4 with doping concentration as 7.5 mol% would have potential applications in phosphor-converted white light-emitting diodes (LEDs).
Keywords/Search Tags:Molybdates, Eu-doping, Hydrothermal Synthesis, Pechini Method, Luminescent Properties, Energy Transfer
PDF Full Text Request
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