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Deep submicrometer YAG:Ce phosphor particles with high photoluminescent quantum yield prepared by flame spray synthesis
Author(s) -
Borlaf Mario,
Kubrin Roman,
Aseev Vladimir,
Petrov Alexander Yu,
Nikonorov Nikolay,
Graule Thomas
Publication year - 2017
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/jace.14905
Subject(s) - materials science , photoluminescence , phosphor , quantum yield , amorphous solid , particle size , calcination , luminescence , chemical engineering , cerium , nanoparticle , analytical chemistry (journal) , particle (ecology) , mineralogy , nanotechnology , metallurgy , optics , crystallography , chemistry , fluorescence , optoelectronics , organic chemistry , physics , oceanography , geology , engineering , catalysis
Abstract YAG:Ce materials have been extensively studied as phosphors for blue to white light conversion. In the last years, the preparation methods of YAG :Ce powders in the nanometric scale have received intensive attention due to their special optical properties. In this context, the preparation of luminescent particles with high quantum yield ( QY ) and particle size in the deep submicrometer range is the main focus of this work. Amorphous and hexagonal YAG :Ce nanoparticles (<20 nm) with the stoichiometric composition of YAG :Ce were synthesized by liquid‐feed flame spray synthesis. The crystal phase, particle size, and specific surface area ( SSA ) evolution with the calcination temperature were investigated. A direct conversion from the amorphous/hexagonal phase to the cubic one was observed at T ≥900°C, together with an increase in the particle size into the range 100‐350 nm and a corresponding decrease in the SSA . Zeta potential of the particles in aqueous dispersions and their photoluminescent properties were characterized. The QY increased for the phosphor powders with lower Ce 3+ concentration. The highest QY of 70%‐72% was obtained for powders containing cerium doping of 0.1 mol% and spanning the size range between 130 and 270 nm.