Long-Term Stability of Optical Properties of Colloidal CdSe Nanocrystals in Polymer Matrices

Azhniuk, Yu. M.; Lopushansky, V. V.; Gomonnai, A. V.; Lopushanska, B. V.; Raevskaya, A. E.; Dzhagan, Volodymyr; Stroyuk, Oleksandr

doi:10.1142/s0219581x19400520

Cited by 1 publication

(1 citation statement)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A vital aspect of the luminescent properties of NCs is the predictable behavior of the PL emission with time [ 19 ]. Most applications demand stability of the PL intensity, peak position, and spectral line shape.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%