Abstract
: phosphor with high luminescence intensity and long afterglow duration was synthesized using 1.0 m (), 0.1 m (), and 0.05 m () particle sizes of . SEM observation results showed that spike-like thin particles were formed when 0.05 m - was used as raw material. Hexagonal thick particles were observed when 0.1 m - was used. But irregular, thin particles were observed while using 1 m -. Photoluminescence measurements showed that both the initial intensity and the long persistency were much higher for the phosphor prepared using - of 0.05 m particle size.
Highlights
Of the phosphors, the alkali earth aluminates containing rare earth ions are functional inorganic materials with strong luminescence in blue to red regions [1,2,3]
When γ-Al2O3 of smaller particle size was used as precursor powder, a ball-like microstructure composed of spikes or elongated plates was observed
The porous microstructure was further supported by the density of the prepared pellets that decreased on increasing the particle size of raw alumina powder and the phosphor particles (0.05 μ–1.909 g/cm3 > 0.1 μ–1.87 g/cm3 > 1.0 μ–1.803 g/cm3)
Summary
The alkali earth aluminates containing rare earth ions are functional inorganic materials with strong luminescence in blue to red regions [1,2,3]. These materials are widely used in various fields; to highlight a few, one may include emergency signs, low level lightening escape systems, military applications, textile fibers, lightening apparatus, exit signboards, and many more [4]. This letter reports the effect of raw Al2O3 type and size on the formation of regular particles for the higher luminescence intensity of Sr4Al14O25:Eu2+, Dy3+ phosphor
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