Ghosh, Pushpal and Kar, Arik and Patra, Amitava (2010) Energy transfer study between Ce3+ and Tb3+ ions in doped and core-shell sodium yttrium fluoride nanocrystals. nanoscale .
Full text is not hosted in this archive but may be available via the Official URL, or by requesting a copy from the corresponding author.
Official URL: http://www.rsc.org/delivery/_ArticleLinking/Displa...
Here, we report the preparation of Ce3+ and Tb3+ co-doped sodium yttrium fluoride nanorods and NaYF4:Ce3+/Tb3+ core-shell nanoparticles by the emulsion method. The core-shell nanoparticles are confirmed by X-ray diffraction study and transmission electron microscopy (TEM) analysis. The hexagonal crystal phase of Ce3+-doped sodium yttrium fluoride nanocrystals is converted to the cubic polymorph after surface coating by TbF3. Cell volume, cell parameters and lattice strain have been modified due to core-shell structure. The decay times are found to be 8.4 ms and 5.4 ms for doped nanorods and core-shell nanoparticles, respectively, which reveals that non-radiative decay is higher in the case of core-shell nanoparticles than doped nanorods. Energy transfer efficiencies from Ce3+ to Tb3+are 65% and 45% for doped Na(Y1.5Na 0.5)F6:Ce:Tb material and NaYF4:Ce/Tb core-shell materials, respectively. Quantum yields are found to be 75% and 42% for doped and core-shell samples, respectively.
|Subjects:||Material Science > Nanochemistry|
|Deposited On:||02 Jun 2010 18:16|
|Last Modified:||02 Jun 2010 18:16|
Repository Staff Only: item control page