Luminescence properties of Mn-doped GeO₂-based glasses

Abstract

Germanate glasses doped with Mn ions were prepared by a melt-quenching method, and the site and luminescence properties of Mn²⁺ ion were investigated. In the germinate glasses containing of Li₂O and ZnO, the octahedrally coordinated Mn²⁺ ions were easily formed, and the red luminescence band due to the ⁴T₁→⁶A₁ transition appeared at the central wavelength of 610 nm. In particular, 75GeO₂-10M₂O-15ZnO glasses (M: Li, Na, and K) showed the strong red luminescence.