Ghosh, Pushpal ; de la Rosa, Elder ; Oliva, Jorge ; Solis, David ; Kar, Arik ; Patra, Amitava (2009) Influence of surface coating on the upconversion emission properties of LaPO4:Yb/Tm core-shell nanorods Journal of Applied Physics, 105 (11). Article ID 113532. ISSN 0021-8979
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Official URL: http://aip.scitation.org/doi/10.1063/1.3143890
Related URL: http://dx.doi.org/10.1063/1.3143890
Abstract
A solution based hydrothermal method is used for the preparation of LaPO4:Yb–Tm doped and LaPO4:Yb/Tm core-shell upconverted nanorods. The morphologies, structure, formation mechanism, and upconversion emission properties of these nanocrystals are investigated in detail. Tensile strain is observed for LaPO4:Yb–Tm doped material but compressive strain is obtained for LaPO4:Yb/Tm core-shell material. Analysis suggests that the lattice strain plays an important role on the upconversion emission. Bright blue (475 nm) and red (650 nm) upconversion emissions associated to 1G4→3H6 and 3F2→3H6 transitions were observed and a significant higher in upconversion emission intensity is observed in core-shell nanorods. The effective decay time calculated are 230 and 110 μs for core-shell and doped nanorods, respectively, indicating the removal of surface defects due to surface coating. It reveals that the core-shell structure shows better upconversion emission efficiency.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to AIP Publishing. |
| ID Code: | 104780 |
| Deposited On: | 01 Dec 2017 11:03 |
| Last Modified: | 01 Dec 2017 11:03 |
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