Abstract
We synthesized a high-performance red-emitting nano-sized Eu-doped Y2O3 phosphor (Y2O3:Eu) powder by a metal-ionic crosslinker-containing polymeric method using carboxymethyl cellulose (CMC), with post heat treatment at 1000°C in air. This method yields soft but large aggregates of nanocrystalline Y2O3:Eu particles as synthesized, and therefore, to obtain the phosphor powder consisting of nano-sized single grains pulverization of the aggregates by ball milling or other methods is needed; this pulverizing process generally causes a deterioration of the fluorescence of Y2O3:Eu powders. To solve this problem we established a new method to obtain nano-sized Y2O3:Eu powders without mechanical pulverization by using ∅50-μm yttria-stabilized zirconia balls, which were added in a reaction vessel as an aggregation suppressant. By this method high-performance red-emitting Y2O3:Eu powders with grain sizes of 20–30 nm were successfully produced.
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