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Optical Transparency Enabled by Anomalous Stokes Shift in Visible Light-Emitting CuAlS2-Based Quantum Dots

Bhattacharyya, Biswajit and Pandit, Triloki and Rajasekar, Guru Pratheep and Pandey, Anshu (2018) Optical Transparency Enabled by Anomalous Stokes Shift in Visible Light-Emitting CuAlS2-Based Quantum Dots. In: JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 9 (15). pp. 4451-4456.

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Official URL: http://dx.doi.org/10.1021/acs.jpclett.8b01787

Abstract

We observe and study the anomalous Stokes shift of CuAlS2/CdS quantum dots. While all known I-III-VI2 semiconductor core/shell quantum dots show Stokes shifts in excess of 100 meV, the shift associated with CuAlS2/CdS quantum dots is uniquely large, even exceeding 1.4 eV in some cases. CuAlS2/CdS quantum dots are thus associated with cross sections less than 10(-17) cm(2) under the emission maximum. We investigate this anomaly using spectroscopic techniques and ascribe it to the existence of a strong type-II offset between CuAlS2 and CdS layers. Besides their strong Stokes shift, CuAlS2/CdS quantum dots also exhibit high quantum yields (63%) as well as long emission lifetimes (similar to 1500 ns). Because of the combined existence of these properties, CuAlS2/CdS quantum dots can act as tunable, transparent emitters over the entire visible spectrum. As a demonstration of their potential, we describe the construction of a wide area transparent lighting device with waveguided optical excitation and a clear aperture of 7.5 cm(2).

Item Type: Journal Article
Additional Information: Copy right for this article belong to AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Depositing User: Id for Latest eprints
Date Deposited: 29 Aug 2018 16:02
Last Modified: 29 Aug 2018 16:02
URI: http://eprints.iisc.ac.in/id/eprint/60524

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