Abstract
The purpose of this study was to demonstrate the preparation of spherical submicron YAG:Ce particles with controllable particle outer diameters and crystallite sizes and their photoluminescence (PL) properties, which were produced using a flame-assisted spray-pyrolysis method followed by the annealing process. The correlation of particle outer diameter, crystallite size, and PL performance of the prepared particles was also investigated. Experimental results showed that the increases in the particle outer diameters have an impact on the obtainment of higher PL performance. Large particle outer diameters permitted the crystallites to grow more, whereas this is in contrast to the condition for small particle outer diameter having limitations in crystallite growth. This study also found that too large outer diameter (>557 nm) was not effective since crystallites cannot grow anymore and it permits possible scattering problems. This study provides significant information for optimizing synthesis parameters for controlling particle outer diameters and crystallite sizes, which could be relevant to other functional properties, especially for lens, solar cell, and LED applications.
Highlights
Effective photoluminescence (PL) designs have attracted a lot of attention
yttrium aluminum hexagonal (YAH) phase is a metastable form in the Y2O3–Al2O3 system
The X-ray powder diffraction (XRD) diffraction patterns of annealed samples show compatibility with pure yttrium aluminum garnet (YAG) based on crystallography open database (COD) no. 2003066
Summary
The formation of particles with spherical morphology is very important in the synthesis of PL particles to obtain high brightness and high resolution. It is well known that spherical particles are more important because of their higher packing density, lower light scattering, and brighter luminescence performance.[1]. The purity of the emission color becomes dependent on the particle outer diameter.[2,3]. (iii) Composition of crystallinity and crystallite size.[4,5] (iv) The stoichiometric composition ratio of precursors in the synthesis process.[1,6] (v) Doping component and heat treatment. Defect structures in the material can be made through heat treatment.[1,7]
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