Please use this identifier to cite or link to this item:
|Title:||Comprehensive study on the size effects of the optical properties of NaYF4:Yb,Er nanocrystals||Authors:||Yuan, D.
|Issue Date:||27-Jun-2013||Citation:||Yuan, D., Tan, M.C., Riman, R.E., Chow, G.M. (2013-06-27). Comprehensive study on the size effects of the optical properties of NaYF4:Yb,Er nanocrystals. Journal of Physical Chemistry C 117 (25) : 13297-13304. ScholarBank@NUS Repository. https://doi.org/10.1021/jp403061h||Abstract:||Monodisperse β-NaYF4:Yb,Er nanocrystals with mean sizes of 11, 40, and 110 nm were synthesized by a thermal decomposition solvothermal process to better understand the relationship between particle size and optical properties. A systematic study of luminescence intensity versus size revealed that both visible upconversion and infrared downconversion emission intensities decrease with decreasing nanocrystal size. The intrinsic quantum efficiency of the infrared 4I13/2 → 4I15/2 downconversion transition was studied in great detail since this specific transition allows us to quantify the contribution of nonradiative losses more easily than the observed upconversion transitions. The intrinsic quantum efficiency of the 4I13/2→4I15/2 transition decreased from 50% (110 nm) to 15% (11 nm). Multiphonon relaxation and -OH quenching was studied in these materials by measuring the vibrational characteristics of β-NaYF4:Yb,Er nanospheres. While multiphonon relaxation exhibited increased contribution to nonradiative decay, -OH quenching rates were calculated to be ∼4 orders of magnitude higher than that of the multiphonon relaxation. Therefore, surface -OH quenching effects were concluded to be primarily responsible for the observed dependence of emission intensity versus particle size. © 2013 American Chemical Society.||Source Title:||Journal of Physical Chemistry C||URI:||http://scholarbank.nus.edu.sg/handle/10635/86228||ISSN:||19327447||DOI:||10.1021/jp403061h|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Aug 5, 2020
WEB OF SCIENCETM
checked on Aug 5, 2020
checked on Aug 2, 2020
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.