Abstract
The structural and optical properties of the AuBr nanocrystals embedded in the KBr single crystals grown by the Czochralski method were studied using several techniques. The X-ray diffraction reveals their formation and incorporation. The crystallite average radii calculated from XRD using the Scherrer's formula was found to vary between 19 and 39 nm. The photoluminescence spectra obtained on these same samples present an emission band located at 1.91 eV (650 nm), which can be attributed to the orange luminescence of AuBr nanocrystals. However, the photoluminescence excitation measurements of these nanocrystals exhibit an excitation band located at 3.44 eV (360 nm), slightly shifted towards higher energies in comparison with the massive crystal.
Highlights
Nanocrystals are the materials placed, according to their size between massive materials and molecular clusters
X-ray diffraction The structural characterization of KBr single crystals doped with AuBr nanocrystals, was used to study the chemical nature, crystalline quality, size and orientation of nanocrystals dispersed in the crystalline matrix
The last peak was attributed to the plane (224) of the simple tetragonal structure of AuBr characterized by the space group P4 2 /ncm, in accordance with the Joint Committeed on Powder Diffraction Standards (JCPDS) card 01-083-2165
Summary
Nanocrystals are the materials placed, according to their size between massive materials and molecular clusters. The interest in nanomaterials can be explained by their applications in technology such as nanoelectronics. Dramatic changes of their properties as a function of size, very motivating for fundamental research, make them very promising for industrial applications. Increasing the energy band gap, as a result of quantum confinement effect, is attributed to a reduction in the nanocrystals size [1,2,3,4]. Much work has been devoted to nanocrystals incorporated in some dielectric matrices with a broad band gap like glass and alkali halides, which present stabilizing dots well adapted to the manufacturing devices [1,2,3,5,6]
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