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FRET-assisted laser emission in colloidal suspensions of dye-doped latex nanoparticles


The use of commercial long-wavelength (>650 nm) laser dyes in many biophotonic applications has several important limitations, including low absorption at the standard pump wavelength (532 nm) and poor photostability. Here, we demonstrate that the use of Förster type (FRET) energy transfer can overcome these problems to enable efficient, stable near-infrared lasing in a colloidal suspension of latex nanoparticles containing a mixture of Rhodamine 6G and Nile Blue dyes. Experimental and theoretical analyses of the photophysics suggest that the dominant energy transfer mechanism is Förster type via dipole–dipole coupling, and also reveal an unexpected core/shell morphology in the dye-doped nanoparticles. FRET-assisted incoherent random lasing is also demonstrated in solid samples obtained by evaporation of colloidal suspensions.

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Figure 1: FRET-assisted laser emission measurements.
Figure 2: Photophysical study of colloidal suspensions.
Figure 3: FRET-assisted incoherent random lasing.

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This work was supported by the Spanish MICINN (projects TRACE2009-0144, MAT2010-20646-C04-01, MAT2010-20646-C04-04 and MAT2007-65711-C04-02). The authors thank Gobierno Vasco (IT339-10) and Universidad Complutense/Banco Santander (grant no. 921556) for financial support. L.C. thanks MICINN for a predoctoral scholarship (FPI, co-financed by Fondo Social Europeo). The authors also acknowledge technical assistance from the ICTS Microscopy National Center (UCM).

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Authors and Affiliations



L.C. conducted the theoretical FRET analysis and solid sample measurements. E.E. proposed the study of FRET phenomenology in nanoparticles, synthesized the particles and helped with the theoretical FRET analysis. V.M. contributed with sample preparation. J.B. and I.L.-A. conducted the photophysical studies. A.C. supervised and coordinated the project. I.G.-M. conducted the laser measurements and supervised and coordinated the project. L.C. and I.G.-M. coordinated the manuscript preparation. All authors contributed to writing the paper.

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Correspondence to Luis Cerdán.

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The authors declare no competing financial interests.

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Cerdán, L., Enciso, E., Martín, V. et al. FRET-assisted laser emission in colloidal suspensions of dye-doped latex nanoparticles. Nature Photon 6, 621–626 (2012).

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