Volume 127, Number 1, July 2019
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||12 August 2019|
Unconventional energy transfer from narrow to broad luminescent wide band gap materials
1 Materials Research Centre, Indian Institute of Science - Bangalore 560-012, India
2 International Center for Materials Nanoarchitectonics, National Institute for Materials Science Tsukuba, Ibaraki 305-0044, Japan
Received: 29 January 2019
Accepted: 5 July 2019
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.
PACS: 78.60.Lc – Optically stimulated luminescence / 78.67.Hc – Quantum dots / 78.67.-n – Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures
© EPLA, 2019
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