期刊
CHEMISTRY OF MATERIALS
卷 29, 期 18, 页码 7852-7858出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.7b02585
关键词
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资金
- U.S. Department of Energy, Office of Science [DE-SC0016872]
- NSF [DMR-1710063]
- U.S. Department of Energy (DOE) [DE-SC0016872] Funding Source: U.S. Department of Energy (DOE)
Ratiometric sensing strategy relies on the ratio of the two photoluminescence (PL) signals originating from the same nano-object for detecting the changes in the surrounding media. Recently, such dual-color emission has been demonstrated in semiconductor colloids, where the PL signal from a quantum-confined domain was complemented with the secondary emission from transition metal ions or a bulk-like structure. Here, we report on the development of E dual-color nanocrystal colloids featuring a combination of two quantum-confined emitters within the same nano-object. The reported morphology relies on double-well core/barrier/shell arrangement, where zero-dimensional excitons of the core component (PbS) can coexist with two-dimensional excitons of the shell domain (CdSe). As a result, the core and shell emission bands can be independently tuned across 880-1500 nm and 600-650 nm spectral windows, respectively. A CdS potential barrier at the PbS/CdSe interface was designed to suppress the energy and charge diffusion between the two domains allowing both emission bands to exhibit quantum yields over 10%. Fabricated colloids were demonstrated as dual-color probes for sensing the redox environment, where both the energetics and the timing of photoinduced charge transfer to an add-on analyte could be inferred from the ratiometric measurements.
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