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Issue 7, 2019
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Aggregation-induced heterogeneities in the emission of upconverting nanoparticles at the submicron scale unfolded by hyperspectral microscopy

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Abstract

Transparent upconverting hybrid nanocomposites are exciting materials for advanced applications such as 3D displays, nanosensors, solar energy converters, and fluorescence biomarkers. This work presents a simple strategy to disperse upconverting β-NaYF4:Yb3+/Er3+ or Tm3+ nanoparticles into low cost, widely used and easy-to-process polydimethylsiloxane (PDMS)-based organic–inorganic hybrids. The upconverting hybrids were shaped as monoliths, films or powders displaying in the whole volume Tm3+ or Er3+ emissions (in the violet/blue and green/red spectral regions, respectively). For the first time, hyperspectral microscopy allows the identification at the submicron scale of differences in the hybrids' emission colour, due to variations in the relative intensity of the distinct components of the upconversion spectrum. The effect is attributed to the size distribution of the agglomerates of nanoparticles, highlighting the importance of studying the emission at submicron scales, since this effect is not observable in measurements recorded in larger areas.

Graphical abstract: Aggregation-induced heterogeneities in the emission of upconverting nanoparticles at the submicron scale unfolded by hyperspectral microscopy

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Publication details

The article was received on 21 Dec 2018, accepted on 28 Apr 2019 and first published on 21 May 2019


Article type: Paper
DOI: 10.1039/C8NA00412A
Nanoscale Adv., 2019,1, 2537-2545
  • Open access: Creative Commons BY-NC license
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    Aggregation-induced heterogeneities in the emission of upconverting nanoparticles at the submicron scale unfolded by hyperspectral microscopy

    F. Gonell, A. M. P. Botas, C. D. S. Brites, P. Amorós, L. D. Carlos, B. Julián-López and R. A. S. Ferreira, Nanoscale Adv., 2019, 1, 2537
    DOI: 10.1039/C8NA00412A

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