Electrophoretic Deposition of Nano- and Micron-Sized Ba 2 SiO 4 :Eu 2+ Phosphor Particles

Abstract

Electrophoretic deposition (EPD) is a technique to deposit charged particles from a stable suspension under the force of an applied electric field. Although nanoparticles of a variety of materials have been coated by EPD, there have been few direct comparisons of EPD of nano- and micron-sized particles of the same material. The objective of this study is to compare EPD of nano-, nano core/SiO2 shell and micron-sized (Ba0.97Eu0.03)2SiO4 phosphor particles for application in a near-UV LED-based light source. EPD from an amyl alcohol bath was able to produce uniform films for all particle sizes, whereas uniform films were produced only of micron-sized particles in an isopropyl alcohol bath. A new equation was developed for predicting the deposited mass, considering the change in concentration of particles in the bath from both settling and deposition, showed good agreement with the experimental values.