Unconventional energy transfer from narrow to broad luminescent wide band gap materials
Abstract
Here, we demonstrate an unconventional energy transfer with narrow band gap CdTe/PbS quantum dots as donors and broad luminescent wide-band-gap oxide materials as acceptors. As a result, the luminescence of wide band gap materials increases and the enhancement factor follows a linear process for photon conversion as in the case of Förster resonance energy transfer. In addition, the strong anti-reflection effect enabling efficient light harvesting, broad spectral overlapping and strong coupling between quantum dots and oxides are the key processes for the unconventional energy transfer. An enhancement of around ∼5500% is observed for GeO2/PbS quantum dots which is higher than that reported for the conventional energy transfer process. The findings demonstrate unconventional energy transfer which enables a greater understanding and rational engineering of light harvesting devices and quantum light sources.
- Publication:
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EPL (Europhysics Letters)
- Pub Date:
- July 2019
- DOI:
- 10.1209/0295-5075/127/17003
- Bibcode:
- 2019EL....12717003S
- Keywords:
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- 78.60.Lc;
- 78.67.Hc;
- 78.67.-n