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8613401 
Journal Article 
NaLuF4:Yb,Tm up-conversion materials: Investigation of UV emission intensity by experimental design 
Jalili, M; Basatani, S; Ghahari, M; Mohajerani, E 
2018 
Yes 
Advanced Powder Technology
ISSN: 0921-8831
EISSN: 1568-5527 
ELSEVIER SCIENCE BV 
AMSTERDAM 
29 
4 
855-862 
English 
WOS:000430040200002 
NaLuF4 doped Yb/Tm upconversion phosphor was synthesized by a facile hydrothermal method, using EDTA as a chelating agent. The influence of synthesis parameters was investigated on UV emission intensity through face-centered central composite design (CCD). Four parameters including F: RE ratio, pH value, reaction time and ethanol percent were considered as independent variables. It was found that pH value and F: RE ratio have the highest effect on emission intensity and the ethanol percent and the reaction time have mild and low influence on it. Furthermore, at pH 4, nano spherical particles with cubic phase were formed and change of other parameters had low influence on phase transformation. However, the hexagonal micro prisms with the hexagonal phase were predominant at pH >= 6. The role of EDTA was indicated on phase transformation and aggregation of particles at the various value of pH. It was shown that the crystal phase, the surface smoothness and the particle size are influential factors on UV emission intensity. (C) 2018 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved. 
UVup-conversion; Hydrothermal synthesis; Experimental design; LUMINESCENCE PROPERTIES; CONTROLLABLE SYNTHESIS; ENHANCED LUMINESCENCE; PARTICLE-SIZE; MICROCRYSTALS; NANOCRYSTALS; MORPHOLOGY; CRYSTALS