Please use this identifier to cite or link to this item: https://doi.org/10.1021/la201910t
Title: Tuning of the structure and emission spectra of upconversion nanocrystals by alkali ion doping
Authors: Dou, Q.
Zhang, Y. 
Issue Date: 1-Nov-2011
Citation: Dou, Q., Zhang, Y. (2011-11-01). Tuning of the structure and emission spectra of upconversion nanocrystals by alkali ion doping. Langmuir 27 (21) : 13236-13241. ScholarBank@NUS Repository. https://doi.org/10.1021/la201910t
Abstract: Recently, lanthanide based nanocrystals with upconversion fluorescence emission have attracted a lot of interest and the nanocrystals have been used for bioimaging, biodetection, and therapeutic applications. Use of the nanocrystals for multiplexed detection has also been explored; however, nanocrystals with multicolor emission are required. Some efforts have been made to tune the emission spectra of the nanocrystals based on manipulation of upconverting lanthanide ions doped in the crystals or creation of core/shell structures. In this work, alkali ions with an ionic radius slightly larger or smaller than Na such as Li and K were doped into NaYF 4:Yb,Er nanocrystals and their effect on the crystal structure and subsequently the upconversion emission spectra were studied. It was found that the phase transition occurs in the nanocrystals when a different amount of Li and K was doped. Furthermore, the intensity ratios between the blue, green, and red emission peaks changed accordingly, and make it possible to tune the upconversion fluorescence of the nanocrystals by Li and K doping. © 2011 American Chemical Society.
Source Title: Langmuir
URI: http://scholarbank.nus.edu.sg/handle/10635/88196
ISSN: 07437463
DOI: 10.1021/la201910t
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