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• W3178618384 endingPage "1761" @default.
• W3178618384 startingPage "1761" @default.
• W3178618384 abstract "The temperature dependence of the excitonic photoluminescence (PL) and nonlinear absorption characteristics of CdTe nanocrystals (NCs)/polyvinyl alcohol (PVA) film are investigated using steady-state/time-resolved PL spectroscopy and Z-scan methods. The excitonic PL peaks of CdTe NCs can be observed at the wavelengths from 560 to 670 nm, with size changes from 2.1 to 3.9 nm. From the temperature-dependent PL spectra, the smaller photon energy of the PL emission peak, the rapidly decreasing PL intensity, and the wider linewidth are observed with increasing temperature from 80 to 300 K. It is revealed that the excitonic PL is composed of both trapped state and band-edge excitonic state, which presents biexponential fitting dynamics. The short-lived species is due to the surface-trapped state recombination in NCs, which has a photogenerated trapped channel and a time-resolved peak shift. The species with a long-lived lifetime is ascribed to the intrinsic excitonic recombination. Through the femtosecond Z-scan method, the nonlinear absorption coefficient becomes smaller with the increase in the size of the NCs. The optical properties of the CdTe NC/PVA film show the potential of II-VI traditional NCs as display and luminescent materials that can utilize the combination of excitonic PL and nonlinear absorption for expanded functionality." @default.
• W3178618384 created "2021-07-19" @default.
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• W3178618384 date "2021-07-06" @default.
• W3178618384 modified "2023-09-27" @default.
• W3178618384 title "Temperature-Dependent Excitonic Photoluminescence and Nonlinear Absorption of CdTe Nanocrystal/Polyvinyl Alcohol Films" @default.
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• W3178618384 doi "https://doi.org/10.3390/nano11071761" @default.
• W3178618384 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/8308138" @default.
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• W3178618384 hasPublicationYear "2021" @default.
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