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Title: Room temperature molecular up conversion in solution
Authors: Nonat, A
Chan, CF
Liu, T
Platas-Iglesias, C
Liu, Z
Wong, WT 
Wong, WK
Wong, KL
Charbonnière, LJ
Issue Date: 2016
Source: Nature communications, 15 2016, v. 7, no. , p. 1-8
Abstract: Up conversion is an Anti-Stokes luminescent process by which photons of low energy are piled up to generate light at a higher energy. Here we show that the addition of fluoride anions to a D 2 O solution of a macrocyclic erbium complex leads to the formation of a supramolecular [(ErL) 2 F] + assembly in which fluoride is sandwiched between two complexes, held together by the synergistic interactions of the Er-F-Er bridging bond, four intercomplex hydrogen bonds and two aromatic stacking interactions. Room temperature excitation into the Er absorption bands at 980 nm of a solution of the complex in D 2 O results in the observation of up converted emission at 525, 550 and 650 nm attributed to Er centred transitions via a two-step excitation. The up conversion signal is dramatically increased upon formation of the [(ErL) 2 F] + dimer in the presence of 0.5 equivalents of fluoride anions.
Publisher: Nature Publishing Group
Journal: Nature communications 
EISSN: 2041-1723
DOI: 10.1038/ncomms11978
Rights: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
The following publication Nonat, A. et al. Room temperature molecular up conversion in solution. Nat. Commun. 7:11978 (2016) is available at https://dx.doi.org/10.1038/ncomms11978
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