Luminescent Properties of Eu³⁺-Doped Yttrium Oxide Chloride Embedded in Nanoporous Glass

The photoluminescence of Eu³⁺-doped yttrium oxide chloride embedded in nanoporous glass was observed. The emission lines of Eu³⁺ ions become much broader and blue shift were observed in the lines due to ⁵D₀ → ⁷F₂ transitions and Eu-O charge transfer excitation band in comparison with those in the powder phosphor. The ratio intensities of the ⁵D₀ → ⁷F₁ transitions to the ⁵D₀ → ⁷F₂ transitions of Eu³⁺ ion becomes higher and change at different excitation wavelengths such as 393 nm and 254 nm. The two excitation wavelengths belong to the 4f → 4f transition of Eu³⁺ ion and the Eu-O charge transfer, respectively. This material may be developed into a new luminescent glass.