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Reproducible Solvent–Thermal Synthesis, Controlled Microstructure, and Photoluminescence of REPO 4 :Eu 3+ , Tb 3+ (RE=Y, La, and Gd) Nanophosphors
Author(s) -
Xiao Xiuzhen,
Yan Bing
Publication year - 2010
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2010.03716.x
Subject(s) - photoluminescence , monoclinic crystal system , microstructure , materials science , solvent , phase (matter) , hexagonal phase , chemical engineering , nanoparticle , anhydrous , crystallography , analytical chemistry (journal) , nanotechnology , crystal structure , mineralogy , chemistry , composite material , organic chemistry , optoelectronics , engineering
By altering the temperature and solvents, we have synthesized hydrated and dehydrated Eu 3+ /Tb 3+ ‐doped REPO 4 (RE=Y, La, and Gd) nanophosphors via a solvo‐thermal technology. X‐ray powder diffraction and scanning electronic microscopy reveal that they have different structures and different morphologies. REPO 4 prepared under subsequent heating at 80°, 120°, and 160°C for 1 day, respectively, present larger particle size than that formed by heating at 160°C for 3 days. Moreover, at the same temperature of 160°C and pH 3, three different solvents (ethanol, N,N ‐dimethylformamide (DMF), and water) were used, whose influence on the microstructure of LaPO 4 has been examined. As a result, LaPO 4 samples from anhydrous ethanol solvent show a pure hexagonal phase and nanowire morphology, just like that prepared from the water solvent. On the other hand, the microstructure of LaPO 4 samples from DMF–H 2 O‐mixed solvents have been changed: with the increasing volume ratio of DMF to H 2 O, the crystal phase of LaPO 4 has been changed from hexagonal phase to monoclinic phase and the morphology from nanowires to nanoparticles. Finally, the photoluminescence properties of these Eu 3+ (Tb 3+ )‐activated rare earth phosphates have been investigated, indicating that the photoluminescent behavior are related to their crystal phases and microstructures.