Structure and emission properties of glass‐ceramics containing (Eu,Yb) 2 TiO 5 nanocrystals

Potential of oxide glass‐ceramics containing defect‐fluorite nanocrystals as host matrix for rare‐earth ions for efficient spectral conversion is investigated. The oxide glass‐ceramics embedded with defect fluorite pyrochlore (Eu,Yb) 2 TiO 5 nanocrystals are prepared through melt‐quenching and subsequent heat‐treatment. It turns out that part of Eu 3+ and Yb 3+ ions are incorporated into the oxide nanocrystals, and Eu 3+ ions remained in the glassy phase are reduced into Eu 2+ ions. Blue emission from Eu 2+ ions, red emission from Eu 3+ ions, and near‐infrared emission from Yb 3+ ions are generated and modulated by excitation wavelength. These features make oxide glass‐ceramics containing defect‐fluorite (Eu,Yb) 2 TiO 5 nanocrystals promising as host for rare‐earth ions for efficient spectral conversion.