Michael Greben
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View article: Concentration-dependent photophysics of InP/ZnS quantum dots: surface still matters despite thick shells
Concentration-dependent photophysics of InP/ZnS quantum dots: surface still matters despite thick shells Open
Core-shell InP/ZnS quantum dots exhibit the dilution-induced suppression of luminescence efficiency and lifetime. The results show that even in type-I heterostructures with thick shells excitonic wavefunctions remain susceptible to surface…
View article: Modulating lifetime distribution through variable excitation pulse length and power: a case study on colloidal PbS quantum dots
Modulating lifetime distribution through variable excitation pulse length and power: a case study on colloidal PbS quantum dots Open
We investigated the laser power-dependent photoluminescence (PL) decay profiles of oleic-acid capped PbS quantum dots (QDs) in toluene, with a mean size of approximately 2.6 nm, under both long duration (LD) and short duration (SD) excitat…
View article: Radiometric characterization of daytime luminescent materials directly under the solar illumination
Radiometric characterization of daytime luminescent materials directly under the solar illumination Open
The materials efficiently emitting photoluminescence (PL) under solar irradiation could find broad applications in passive radiative cooling of buildings, urban heat mitigation, and solar energy harvesting. In this work, we discuss the lim…
View article: Barrier-Dependent Photoluminescence of Silicon Nanocrystals in Quadlayer Samples: Inter-Layer Si Diffusion or Excitonic Energy Transfer?
Barrier-Dependent Photoluminescence of Silicon Nanocrystals in Quadlayer Samples: Inter-Layer Si Diffusion or Excitonic Energy Transfer? Open
View article: Inverse heavy-atom effect in near infrared photoluminescent gold nanoclusters
Inverse heavy-atom effect in near infrared photoluminescent gold nanoclusters Open
Gold nanoclusters functionalized with heavy atoms show enhanced excited triplet lifetime due to suppression of non-radiative deactivation in favour of radiative decay.
View article: Correction: Inverse heavy-atom effect in near infrared photoluminescent gold nanoclusters
Correction: Inverse heavy-atom effect in near infrared photoluminescent gold nanoclusters Open
Correction for ‘Inverse heavy-atom effect in near infrared photoluminescent gold nanoclusters’ by Goutam Pramanik et al. , Nanoscale , 2021, DOI: 10.1039/d1nr02440j.
View article: Nearly perfect near-infrared luminescence efficiency of Si nanocrystals: A comprehensive quantum yield study employing the Purcell effect
Nearly perfect near-infrared luminescence efficiency of Si nanocrystals: A comprehensive quantum yield study employing the Purcell effect Open
Thin layers of silicon nanocrystals (SiNC) in oxide matrix with optimized parameters are fabricated by the plasma-enhanced chemical vapor deposition. These materials with SiNC sizes of about 4.5 nm and the SiO 2 barrier thickness of 3 nm r…
View article: Absolute up- and down-conversion luminescence efficiency in hexagonal Na(Lu/Y/Gd)F4: Yb, Er/Tm/Ho with optimized chemical composition
Absolute up- and down-conversion luminescence efficiency in hexagonal Na(Lu/Y/Gd)F4: Yb, Er/Tm/Ho with optimized chemical composition Open
Up- and down-conversion luminescence efficiency of hexagonal NaYF4, NaLuF4 and NaGdF4, prepared by a novel hydrothermal method using succinic acid and codoped with Yb and Er/Tm/Ho, was investigated over a broad spectral range 350 – 1640 nm…
View article: Changes of the absorption cross section of Si nanocrystals with temperature and distance
Changes of the absorption cross section of Si nanocrystals with temperature and distance Open
The absorption cross section (ACS) of silicon nanocrystals (Si NCs) in single-layer and multilayer structures with variable thickness of oxide barriers is determined via a photoluminescence (PL) modulation technique that is based on the an…
View article: Radiometric calibration of optical microscopy and microspectroscopy apparata over a broad spectral range using a special thin-film luminescence standard
Radiometric calibration of optical microscopy and microspectroscopy apparata over a broad spectral range using a special thin-film luminescence standard Open
Application capabilities of optical microscopes and microspectroscopes can be considerably enhanced by a proper calibration of their spectral sensitivity. We propose and demonstrate a method of relative and absolute calibration of a micros…