Influence of the electrostatic filter field on particle size control of (La0.98Eu0.01Bi0.01)NbO4 red phosphor prepared using spray pyrolysis

In the spray pyrolysis (SP) process, a reaction occurs within the droplet; the resulting particles have more uniform composition (micrometric scale) as compared with particles obtained by other techniques. However, controlling particle size during SP remains a major challenge, because this process generates particles measuring between 50 nm and 2.0 μm. This study investigates the synthesis of spherical polydispersed (La0.98Eu0.01Bi0.01)NbO4 particles under different electrostatic filter fields and their photoluminescence properties. The filter field variations allow for collection of distinct particles sizes, permitting better particle packing. Our results shown that lower electrostatic fields resulted in a collection rate of 60% of all particles under 200 nm. In addition, the luminescent properties of the expermiment resulted in a quantum efficiency of 40% and the CIE chromaticity coordinates being x=0.67 and y=0.33.