Photoactivation of CdSe Quantum Nanoplatelet Luminescence

Smelov, V. N.; Маслов, В. Г.; Safin, Farrukh; Cherevkov, Sergei A.; Баранов, А. В.; Fëdorov, A. V.

doi:10.1134/s0030400x20080342

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“…Therefore, the investigation of the temporal behavior of the PL spectra of QDs, in particular in application-relevant environments, such as water solutions or polymer matrices, is vitally important. There are studies of the PL spectra of colloidal II-VI NCs under a prolonged illumination in solutions [ 23 , 24 , 25 , 26 , 27 , 28 ], dried on substrates [ 29 , 30 , 31 ], and embedded in polymers [ 23 , 24 , 32 , 33 , 34 , 35 ]. The studies revealed a puzzling variety of trends in intensity and spectral changes, indicating multifaceted physical and chemical processes underlying the apparent PL photoenhancement, which differ significantly between particular studies.…”

Section: Introductionmentioning

confidence: 99%

Photoinduced Enhancement of Photoluminescence of Colloidal II-VI Nanocrystals in Polymer Matrices

et al. 2020

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The environment strongly affects both the fundamental physical properties of semiconductor nanocrystals (NCs) and their functionality. Embedding NCs in polymer matrices is an efficient way to create a desirable NC environment needed for tailoring the NC properties and protecting NCs from adverse environmental factors. Luminescent NCs in optically transparent polymers have been investigated due to their perspective applications in photonics and bio-imaging. Here, we report on the manifestations of photo-induced enhancement of photoluminescence (PL) of aqueous colloidal NCs embedded in water-soluble polymers. Based on the comparison of results obtained on bare and core/shell NCs, NCs of different compounds (CdSe, CdTe, ZnO) as well as different embedding polymers, we conclude on the most probable mechanism of the photoenhancement for these sorts of systems. Contrary to photoenhancement observed earlier as a result of surface photocorrosion, we do not observe any change in peak position and width of the excitonic PL. Therefore, we suggest that the saturation of trap states by accumulated photo-excited charges plays a key role in the observed enhancement of the radiative recombination. This suggestion is supported by the unique temperature dependence of the trap PL band as well as by power-dependent PL measurement.

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