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Issue 37, 2018, Issue in Progress
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Introducing carbon dots to moderate the blue emission from zinc vanadium oxide hydroxide hydrate nanoplates

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Abstract

The relative intensity of the blue component of the total emission from light-emitting diodes (LEDs) can be an important factor when assessing their biological safety. Carbon quantum dots (CQDs) are compatible with many materials and present a high density of multiple surface states; the incorporation of such CQDs thus offers a route to modifying the emission from a given LED matrix. Here we report the fabrication of stable CQD/zinc pyrovanadate (Zn3(OH)2V2O7·2H2O) nanoplate composites via a facile hydrothermal route. Structural and morphological analyses confirm that the nanoplates are hexagonal phase and grew normal to the [0001] direction. X-ray photoemission spectroscopy, Raman and infrared spectroscopy demonstrate that the CQDs combine with nanoplates via surface carbon–oxygen bonds. Wavelength resolved photoluminescence measurements show that the relative intensity of the blue (2.93 eV) component of the emission associated with the nanoplates is significantly reduced by incorporating CQDs. We suggest that this reduction arises as a result of preferential trapping of the higher energy photoelectrons by surface defects on the CQDs.

Graphical abstract: Introducing carbon dots to moderate the blue emission from zinc vanadium oxide hydroxide hydrate nanoplates

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Publication details

The article was received on 19 Apr 2018, accepted on 31 May 2018 and first published on 06 Jun 2018


Article type: Paper
DOI: 10.1039/C8RA03359E
Citation: RSC Adv., 2018,8, 20686-20691
  • Open access: Creative Commons BY-NC license
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    Introducing carbon dots to moderate the blue emission from zinc vanadium oxide hydroxide hydrate nanoplates

    P. Huang, G. Yuan, T. Wei, J. Li and Michael N. R. Ashfold, RSC Adv., 2018, 8, 20686
    DOI: 10.1039/C8RA03359E

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