Effect of Alkali Compound on Morphology and Luminescence Intensity of Europium-doped Yttria

Abstract

Luminescent particles of europium-doped yttria (Y₂O₃:Eu) have been synthesized by heating nitrous precursors in a solution of polyethylene glycol (PEG) matrix containing alkali compound (LiOH, NaCl, KCl, and CaCl2). High luminescence intensity at around 612 nm contributed by electron transitions in Eu³⁺(⁵D₀ → 7F0, ⁵D₀  → ⁷F₁,⁵D₀ → ⁷F₂, and ⁵D₀ → ⁷F₃) were observed. The highest intensity was observed in samples prepared using Li compound, but he smallest particle size was observed in samples prepared using Ca compound. This approach is promising for production of submicrometer down to nanometer-sized Y2O3:Eu particles that have both small in particle sizes and high luminescence intensity which is potential for use in development of luminescence ink that can be adapted to the current ink jet printing technology.