tailieunhanh - Báo cáo hóa học: " Hydrothermal Synthesis, Microstructure and Photoluminescence of Eu3+-Doped Mixed Rare Earth Nano-Orthophosphates"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Hydrothermal Synthesis, Microstructure and Photoluminescence of Eu3+-Doped Mixed Rare Earth Nano-Orthophosphates | Nanoscale Res Lett 2010 5 1962-1969 DOI s11671-010-9733-8 NANO EXPRESS Hydrothermal Synthesis Microstructure and Photoluminescence of Eu3 -Doped Mixed Rare Earth Nano-Orthophosphates Bing Yan Xiuzhen Xiao Received 19 April 2010 Accepted 5 August 2010 Published online 18 August 2010 The Author s 2010. This article is published with open access at Abstract Eu3 -doped mixed rare earth orthophosphates rare earth La Y Gd have been prepared by hydrothermal technology whose crystal phase and microstructure both vary with the molar ratio of the mixed rare earth ions. For LaxY1-xPO4 Eu3 the ion radius distinction between the La3 and Y3 is so large that only Eu3 shows the pure monoclinic phase. For LaxGd1-xPO4 Eu3 system with the increase in the La content the crystal phase structure of the product changes from the hexagonal phase to the monoclinic phase and the microstructure of them changes from the nanorods to nanowires. Similarly YxGd1-xPO4 Eu3 Eu3 and Eu3 samples present the pure hexagonal phase and nanorods microstructure while Eu3 exhibits the tetragonal phase and nanocubic micromorphology. The photoluminescence behaviors of Eu3 in these hosts are strongly related to the nature of the host composition crystal phase and microstructure . Keywords Mixed rare earth orthophosphate Nanophosphors Europium ion Hydrothermal synthesis Microstructure Photoluminescence Introduction Nanostructure materials with controlled chemical composition crystal phase structure morphology and particle size have been extensively investigated during the past few decades because of their high surface volume ratio and the B. Yan X. Xiao Department of Chemistry Tongji University 200092 Shanghai China e-mail byan@ special quantum confinement effect 1 2 . Nanomaterials can show remarkable tunable properties and play an important role as active components in the preparation of nanoscale electronic optical .