triozine.blogg.se

Trap states core shell
Trap states core shell











Based on sizing data from transmission electron microscopy (TEM), it is observed that at the same particle diameter, average radiative lifetimes can differ as much as 20-fold across different shell compositions due to the relative positions of valence and conduction bands.

trap states core shell

Photoluminescence emission colors have been successfully tuned throughout the visible and into the near infrared (NIR) wavelength ranges for type-I and type-II heterostructures, respectively. The empirical results are compared to bandgap energy predictions made with effective mass modeling. The shell thickness and composition dependence of the bandgap for type-I and type-II heterostructures was observed by coating the InP core with ZnS, ZnSe, CdS, or CdSe through one to ten iterations of a successive ion layer adsorption and reaction (SILAR)-based shell deposition. In this paper, the dependence of the bandgap, photoluminescence emission, and exciton radiative lifetime of core/shell quantum dot heterostructures has been investigated using colloidal InP core nanocrystals with multiple diameters (1.5, 2.5, and 3.7 nm). The large bulk bandgap (1.35 eV) and Bohr radius (~10 nm) of InP semiconductor nanocrystals provides bandgap tunability over a wide spectral range, providing superior color tuning compared to that of CdSe quantum dots. 4Los Alamos National Laboratory, Materials Physics and Applications Division, Center for Integrated Nanotechnologies, Los Alamos, NM, United States.3Department of Biomedical Engineering, Boston University, Boston, MA, United States.

trap states core shell

  • 2Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM, United States.
  • 1Division of Materials Science and Engineering, Boston University, Boston, MA, United States.
  • Reyhaneh Toufanian 1, Andrei Piryatinski 2, Andrew H.













    Trap states core shell