White‐ and blue‐light‐emitting dysprosium(III) and terbium(III)‐doped gadolinium titanate phosphors

Abstract

Here we report the synthesis and structural, morphological, and photoluminescence analysis of white- and blue-light-emitting Dy - and Tm -doped Gd Ti O nanophosphors. Single-phase cubic Gd Ti O nanopowders consist of compact, dense aggregates of nanoparticles with an average size of ~25 nm for Dy -doped and ~50 nm for Tm -doped samples. The photoluminescence results indicated that ultraviolet (UV) light excitation of the Dy -doped sample resulted in direct generation of white light, while a dominant yellow emission was obtained under blue-light excitation. Intense blue light was obtained for Tm -doped Gd Ti O under UV excitation suggesting that this material could be used as a blue phosphor.