Morphology Control of Multicomponent Oxide Phosphor Particles Containing High Ductility Component by High Temperature Spray Pyrolysis

Abstract

The blue phosphor BaMgAl 10 O 17 :Eu 2ϩ particles with sphericity and nonaggregation was prepared by high-temperature spray pyrolysis. Characteristics of the as-prepared and the post-treated particles such as crystallinity, morphology, and luminescence were investigated. The as-prepared particles at 1200ЊC had an amorphous phase, and the sphericity of as-prepared particles disappeared after post-treatment at 1300ЊC. On the other hand, the as-prepared particles at 1500 and 1700ЊC have good crystallinity of BaMgAl 10 O 17 , and its morphology was maintained after post-treatment. The mean size of particles obtained from 0.3 M solution was 0.6 m. The particles which were directly prepared by spray pyrolysis had higher PL intensities than those of post-treated particles. The good morphology of particles directly prepared by spray pyrolysis caused the high luminescence intensity in comparison with the post-treated particles.

Synthesis of Blue‐Emitting CaMgSi2O6:Eu2+ Phosphor Using an Electrostatic Self‐Assembly Deposition Method

“…Consideration should also be given to the fact that for powdered phosphors, luminescence characteristics are dependent on morphology such as particle size and agglomeration. Less aggregated fine particles are believed to show a better emission intensity than aggregated particles owing to their higher packing density, as discussed in the literature 15,16 . The fine morphology of the prepared phosphor might account for the improved emission intensity.…”

Characterization of Ca2SiO4:Eu2+ Phosphors Synthesized by Polymeric Precursor Process

“…On the other hand, the emission intensity of C 2 S:Eu 2+ phosphor prepared by solid‐state reaction was approximately one‐third of that by polymeric precursor process at 1300°C, although the particle size was about three times larger. The reason is not well understood at this stage, but the lower intensity appears to be related to the irregular shape with rough surface, which scatters the incident or emitting light, resulting in the decrease of PL intensity 19,20 …”

Yolk–shell structured Gd2O3:Eu3+ phosphor prepared by spray pyrolysis: the effect of preparation conditions on microstructure and luminescence properties

“…[22][23][24] Basically, luminescence properties of phosphors depend on the type of activators and host composition; a homogeneous distribution of activator ions throughout the host material is needed to obtain high luminescence for advanced display devices. 25 To prepare phosphor powders satisfying the requirements listed above, a number of synthetic approaches such as sol-gel, [26][27][28] combustion, 29,30 polymer precursor, 31 glycothermal, 32 spray pyrolysis, [33][34][35][36] spray drying, 37,38 and hydrothermal methods 39,40 have been investigated. As a result, the powders produced have a wide variety of morphologies, including filled sphere, hollow sphere, nanorod, nanowire, nanoplate, core-shell, tube, and fiber structures.…”