Bishnoi, Swati and Khichar, Naveen and Das, Rupali and Kumar, Vineet and Kotnala, R. K. and Chawla, Santa
(2014)
Triple excitation with dual emission in paramagnetic ZnO:Er3+ nanocrystals.
RSC Advances, 4 (62).
pp. 32726-32729.
ISSN 2046-2069
Abstract
ZnO nanocrystals have been made excitable under UV as well as near and far infrared (IR) wavelengths (980 nm, 1550 nm) through doping of rare earth ion Er3+ thus making it a triple excitation nanophosphor. Whereas the visible emission under UV is broad due to intrinsic donor acceptor pair recombination, the sharp green and red emission peaks under IR are characteristic of f-f transitions of the Er3+ ion. Thus both down and upconversion fluorescence in ZnO could be realised through doping of rare earth ion Er3+ that also makes ZnO: Er3+ nanocrystals paramagnetic. To the best of our knowledge we are reporting upconversion at 1550 nm in ZnO: Er3+ for the first time.
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