Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, Vol.252, 79-86, 1994
Luminescence Properties of Indirect Bandgap Semiconductors - Nanocrystals of Silver Bromide
Using a modified reverse micelle protocol with acetyl bromide as the bromide source, AgBr nanocrystals can be grown over a size range from 30 Angstrom radius to bulk. These clusters exhibit quantum confinement indicated by an increasing blue shift of the free exciton emission peak as a function of size. As the cluster size decreases, a concomitant decrease occurs in the apparent radiative lifetime. This is predicted as the ($) under bar k selection rules break down at small crystal diameters. However, the effects are quite modest, indicating that even at these smallest sizes, the indirect character of the transition is largely retained.
Keywords:COLLOIDAL-CADMIUM-SULFIDE;REDOX POTENTIALS;AQUEOUS-SOLUTION;QUANTUM DOTS;CRYSTALLITES;CONFINEMENT;MOLECULES;ELECTRON;SURFACE;STATE