Inorganically Functionalized PbS–CdS Colloidal Nanocrystals: Integration into Amorphous Chalcogenide Glass and Luminescent Properties

Exposure enhanced photoluminescence of CdS0.9Se0.1quantum dots embedded in spin-coated Ge25S75thin films

“…Our Ge 25 S 75 doped thin lms were exposed to 365 nm UV light only for 60 min, but increase in PL intensity is much more signicant. Considering our results as well as results published in, 35,36 we can assume that observed UV induced increase in PL intensity is probably connected with some structural changes on the boundary between CdS 0.9 Se 0.1 QDs and Ge 25 S 75 glass matrix.…”

“…[32][33][34] Previous results proved that spin-coated ChG thin lms can be also used as host matrix for QDs. 35,36 The usage of ChG host matrix can be advantageous because ChGs possess higher refractive index and wider VIS-NIR-MIR transparent region in comparison with organic polymers. [37][38][39] In this work, we report on (a) "one pot" preparation and characterization of highly PL CdS 0.9 Se 0.1 nanoparticles (b) and their usage for doping of Ge 25 S 75 ChG solution.…”

“…Present CdS 0.9 Se 0.1 QDs can be also bonded to glass matrix by sulfur bridging atoms, which can result in decrease of QDs PL due to the exciton energy transfer and possible disruption of QDs crystalline lattice. Kovalenko et al 35 have prepared inorganically functionalized core-shell PbS/CdS QDs with As-S capping agent, which had strong IR PL in As 2 S 3 glass matrix. Novak et al 36 have also successfully doped Ge 23 Sb 7 S 70 glass matrix with PbS quantum dots and core-shell CdSe/ZnS QDs, but they have obtained well-developed and separated PL peaks only by using the core-shell CdSe/ZnS QDs.…”

Inorganic Surface Ligands for Colloidal Nanomaterials

“…In order to address these issues, we replaced the organic ligands from the surface of the near-IR emitting PbS/CdS NCs with inorganic As 2 S 3 3− ligands. The NCs were then incorporated into an amorphous As 2 S 3 matrix to increase the inter-NC distance [43]. Since amorphous As 2 S 3 is transparent in the near-to mid-IR region, this NC/host composite provides a bright and stable IR luminescence in the telecommunication wavelength region.…”

Electrospray Deposition of Uniform Thickness Ge₂₃Sb₇S₇₀ and As₄₀S₆₀ Chalcogenide Glass Films

“…Generally, solutionderived films tend to result in higher loss of the light signal due to the presence of residual solvent in the film matrix 3 , but a unique advantage of solution-derived techniques over vapor deposition is the simple incorporation of nanoparticles (e.g., quantum dots or QDs) prior to spin-coating [8][9][10] . However, aggregation of nanoparticles has been observed in spin-coated films 10 .…”