Spherical Eu3+-doped calcium titanate phosphor particle preparation via hydrothermal conversion of hydrous titania

Abstract

• Spherical Eu 3+ -doped hydrous titania particles achieved via Ti-alkoxide hydrolysis. • Eu 3+ -doped hydrous titania particles were hydrothermally converted to CaTiO 3 :Eu 3+ . • The CaTiO 3 :Eu 3+ particles precisely maintained the starting Eu 3+ ion composition. • The addition of HPC suppressed the formation of the CaTi 2 O 4 (OH) 2 byproduct. Spherical and uniformly sized CaTiO 3 :Eu 3+ phosphor particles were synthesized via the hydrothermal conversion of Eu 3+ -doped hydrous titania particles. 3 mol% Eu 3+ -doped hydrous titania particles with a uniform size and spherical shape were prepared via hydrolysis of Ti-alkoxide. The prepared particles were hydrothermally treated in a Ca(OH) 2 water suspension and converted to CaTiO 3 phosphor particles. The original Eu 3+ -doped hydrous titania particle morphology and composition were precisely maintained. The addition of hydroxypropyl cellulose to the hydrothermal conversion reaction system inhibited the formation of CaTi 2 O 4 (OH) 2 byproducts, as well as the additional deposition of small precipitates in the liquid phase.