Issue 32, 2013

Lanthanide based resonance energy transfer (LRET) between Ce-doped LaPO4nanorods and coumarin 440 dye

Abstract

Here, we demonstrate an efficient lanthanide based resonance energy transfer (LRET) between Ce-doped LaPO4 nanorods and coumarin 440 dye using steady state and time resolved spectroscopy. Water dispersible stable colloidal Ce-doped LaPO4 nanorods are synthesized via a facile aqueous route using a capping reagent 6-amino hexanoic acid (AHA). XRD and TEM analysis confirm the formation of uniform and discrete Ce-doped LaPO4 nanorods, having a tetragonal phase. FTIR analysis confirms that the surfaces of Ce-doped LaPO4 nanorods are functionalized with AHA. From zeta potential analysis, it is confirmed that the positively charged nanorods are attached to the negatively charged dye molecules electrostatically. Analysis suggests that both dynamic (1.04 × 104 M−1) and static quenching (3.3 × 102 M−1) processes occur in this assembled system. The prepared nanorods show an emission quantum yield of 10.2% and a long fluorescence lifetime (24.9 ns). The spectral overlap of the Ce3+ emission with the absorption of coumarin 440 dye molecules enables an efficient energy transfer from Ce-doped LaPO4 nanorods to coumarin 440 dye. The values of the overlap integral and Förster radius are found to be 2.028 × 1014 M−1 cm−1 nm4 and 27.02 Å, respectively. The PL quenching and the shortening of the decay time of the donor (Ce-doped LaPO4 nanorods) confirm the energy transfer (24%) from the nanorods to the dye. Such energy transfer between LaPO4:Ce nanorods and C-440 dye could pave the way for designing new optical materials for potential applications.

Graphical abstract: Lanthanide based resonance energy transfer (LRET) between Ce-doped LaPO4 nanorods and coumarin 440 dye

Article information

Article type
Paper
Submitted
11 Feb 2013
Accepted
09 May 2013
First published
09 May 2013

RSC Adv., 2013,3, 13372-13380

Lanthanide based resonance energy transfer (LRET) between Ce-doped LaPO4 nanorods and coumarin 440 dye

A. Kar, A. Kundu, S. Bhattacharyya, S. Mandal and A. Patra, RSC Adv., 2013, 3, 13372 DOI: 10.1039/C3RA40728D

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