Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 113, Issue 33, Pages 14702-14707Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp904516s
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Excitation of Ho3+ and Yb3+ co-doped lanthanum silicate and lanthanum zirconate nanoparticles with 980 nm diode laser light nave a red and green glow, respectively, observable by naked eye. Spectroscopic investigations on these materials revealed green (540 nm), red (660 nm), and near-infrared (750 11111) upconversion emissions with the green to red ratio varying with the matrix type and the dopant ion (Yb3+) concentration. The emission was predominantly red for Ho3+:Yb3+ (1:3) in lanthanum silicate nanoparticles, while it was predominantly green for Ho3+ :Yb3+ (1:7) in lanthanum zirconate nanoparticles, A mechanism involving cross-relaxations and energy back transfer has been proposed to explain the observed behavior The predominance of red emission has been attributed to a strong quenching of Ho3+ green emitting level mainly by energy back transfer from Ho3+ to Yb3+ on the basis of the near-infrared (NIR) emission spectral analysis.
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