Electrically Tunable Enhanced Photoluminescence of Semiconductor Quantum Dots on Graphene

Praveena, M and Sai, Phanindra T and Dutta, Riya and Ghosh, A and Basu, JK (2017) Electrically Tunable Enhanced Photoluminescence of Semiconductor Quantum Dots on Graphene. In: ACS PHOTONICS, 4 (8). pp. 1967-1973.

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Abstract

Despite the many fascinating discoveries of fundamental significance and device applications involving graphene, one area that has been lacking is graphene-based displays and emissive devices. Since graphene by itself has weak and wavelength-independent absorption and no emission in the visible range, such devices must rely on synergistic combination with other highly sensitive optical materials such as quantum dots. However, the well-known strong nonradiative energy transfer between emitters and quantum dots and graphene makes it impossible to create such devices due to strong emission quenching. Here we report the first demonstration of enhanced photoluminescence of quantum dots in close proximity to graphene field effect transistor devices, which are electrically and spectrally tunable. The enhanced emission originates from super-radiance between closely packed quantum dots placed close to single-layer graphene, which overcomes the strong nonradiative quenching observed earlier. Finite difference time domain simulations shed light on the regime in which such effects are likely to dominate. Our work opens up new avenues for research on novel displays, lasers, and emissive devices involving graphenequantum dot hybrids as well as to study fundamental aspects of electrically tunable lightmatter interactions at the nanoscale.

Item Type:	Journal Article
Publication:	ACS PHOTONICS
Additional Information:	Copy right for this article belongs to the AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	16 Sep 2017 05:54
Last Modified:	25 Feb 2019 10:35
URI:	http://eprints.iisc.ac.in/id/eprint/57831

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