Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 9, Issue 15, Pages 4451-4456Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.8b01787
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Funding
- Indian Institute of Science
- DST Nano Mission [SR/NM/NS-1117/2012]
- ISRO-IISc-STC [ISTC/CSS/AP/0403]
- IRHPA [IR/S2/PU-0005/2012]
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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).
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