Morphological and Optical Characteristics of Y₂O₃:Eu Phosphor Particles Prepared by Flame Spray Pyrolysis

Abstract

Y2O3:Eu phosphor particles were prepared by flame spray pyrolysis and compared with the particles prepared by general spray pyrolysis. The particles prepared by flame spray pyrolysis had a spherical and dense morphology and were finer than the particles prepared by general spray pyrolysis. Flame temperature was an important factor in the preparation of the phosphor particles by flame spray pyrolysis. To obtain Y2O3:Eu particles with a uniformly dense structure, a sufficiently high temperature to form monoclinic phase was required. Too low flame temperature generated nonspherical and hollow particles with cubic phase because the particles did not melt completely, and too high flame temperature of flame generated many nanoparticles due to evaporation. After stepwise post-treatment of as-prepared particles with monoclinic phase and the dense structure, Y2O3:Eu phosphor particles with high brightness and cubic phase were obtained. The Y2O3:Eu phosphor particles prepared by flame spray pyrolysis showed 120% photoluminescence intensity in comparison with the particles prepared by general spray pyrolysis.

Flame aerosol deposition and annealing of Y3Al5O12:Tb phosphor coatings

“…Usually, synthesized powders are collected by filtering, electrostatic precipitation or thermophoresis [6,7] but they also can be immediately deposited onto a substrate placed near the flame thus forming a particulate coating in a single-step process [8][9][10][11]. Numerous phosphors were prepared by FASP in research laboratories, e.g., SrTiO 3 :Pr, Al [12], Sr 5 (PO 4 ) 3 Cl:Eu [13], BaMgAl 10 O 17 :Eu [14], Y 2 O 3 :Eu [15], Gd 2 O 3 :Eu [16,17], Y 2 SiO 5 :Eu [18], Y 3 Al 5 O 12 :Ce [19].…”

Influence of polymeric additives on morphology and performance of Y2O3:Eu phosphor synthesized by flame-assisted spray pyrolysis

“…The use of the flame as a heat source for decomposition of droplets can provide the advantage of significantly higher temperatures. The successful preparation of fine particles of various phosphors with narrow size distribution, spherical morphology, and a good degree of dispersion has been reported by several authors [8][9][10].…”

“…The temperature of the flame could be increased by enriching the air with oxygen, but this would lead to an increase in setup complexity and related additional expenses. Furthermore, at increased temperatures, yttria tends to crystallize in a monoclinic structure, which significantly decreases photoluminescence (PL)-output [10]. The current work aims to investigate the feasibility of the introduction of organic additives, which polymerize upon heating, in order to improve the morphology of Y 2 O 3 :Eu 3+ and boost the performance of phosphor coatings in DUV-range.…”

Studies on the synthesis of europium activated yttrium oxide by wet-chemical method

“…In the case of Y 2 O 3 :Eu 3+ prepared by wet-chemical synthesis route, the morphology and dimensions of precursor particles are extremely important for the appearance of the phosphor particles [20]. The precursor particle morphology and size are strongly influenced by the precipitating reagent, as illustrated by SEM images (Fig.…”