Greatly Enhanced Broadband Near-infrared Emission Due To Energy Transfer From Cr~(3+) To Ni~(2+) In Transparent Magnesium Aluminosilicate Glass Ceramics

摘要

Cr~(3+)/Ni~(2+) co-doped optically transparent magnesium aluminosilicate glass-ceramics containing MgAl_2O_4 nanocrystals have been prepared by heat-treatment. Greatly enhanced broadband near-infrared emission centered at 1216 nm in Cr~(3+)/Ni~(2+) co-doped glass ceramics is observed when compared with the Ni~(2+) single-doped glass ceramics under 532 nm excitation. The observed enhancement of infrared emission is attributed to the energy transfer from Cr~(3+) to Ni~(2+) ions in the nanocrystalline phase, which leads to the emission due to ~3T_2(~3F) → ~3A_2(~3F) transition of octahedral Ni~(2+) ions.