A novel pair of transition metal ions Cu+, Mn2+is co-doped in borosilicate glasses. Both copper and manganese ions exist in lower valence states (Cusu, Mn2+) in the as-prepared glasses. Around 5-time enhanced Mn2+emission under the UV excitation is observed, which, as demonstrated by excitation spectra and emission decay curves, is due to an energy transfer from Cu+ions resulting in greatly increased absorption of Mn2+ions in the UV region, and relaxation on doubly-forbidden transition of Mn2+leading to the much shortened Mn2+emission lifetime from millisecond to microsecond level. Besides, a composite white emission is generated by combining the blue-green part from Cu+ions with the green-red part from Mn2+ions and it can be effectively tuned from cold to warm by adjusting host glass composition and altering excitation wavelength. Relevant mechanisms are discussed.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials