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. © 2014 Optical Society of America.
Titolo: | Enhanced and shortened Mn2+ emissions by Cu+ co-doping in borosilicate glasses for W-LEDs |
Autori: | |
Data di pubblicazione: | 2015 |
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Handle: | http://hdl.handle.net/20.500.12079/2683 |
Appare nelle tipologie: | 1.1 Articolo in rivista |