Soft Chemistry Routes to YPO4-Based Phosphors: Dependence of Textural and Optical Properties on Synthesis Pathways
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- 作者：J. M. Nedelec ; D. Avignant ; and R. Mahiou
- 刊名：Chemistry of Materials
- 出版年：2002
- 出版时间：February 2002
- 年：2002
- 卷：14
- 期：2
- 页码：651 - 655
- 全文大小：165K
- 年卷期：v.14,no.2(February 2002)
- ISSN：1520-5002
文摘
Different liquid routes have been used to prepare Eu3+-activated YPO4 phosphors. Thesematerials have been compared with conventionally obtained YPO4. For the first time (toour knowledge), a specific sol-gel approach has been developed to produce this material.All phases have been checked with X-ray diffraction (XRD) and solid-state nuclear magneticresonance. Evaluation of the textural properties of the materials with XRD and scanningelectron microscopy have demonstrated that the synthesis pathway can greatly influencethe morphology of the materials and that in particular, the sol-gel route yields the smallestparticles with the narrowest distribution. The optical study of the obtained phosphors showsthat even if all materials exhibit comparable fluorescence in term of energetic scheme, somediscrepancies can be noted according to the preparation route. In particular, liquid derivedmaterials show shorter emission lifetimes; this observation has been correlated with residualOH groups in these materials. We have also observed that the emission yield, which is afundamental parameter for applications purposes, depends on the preparation and that thecoprecipitation technique leads to the best efficiency.