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.
Original language | English |
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Pages (from-to) | 20686-20691 |
Number of pages | 6 |
Journal | RSC Advances |
Volume | 8 |
Issue number | 37 |
Early online date | 6 Jun 2018 |
DOIs | |
Publication status | Published - 2018 |