Luminescence properties of mechanically milled ZnSe

Abstract

ZnSe powder has been ball milled in different conditions to investigate the formation of a nanocrystalline structure. The effect of mechanical milling on the luminescent and structural properties of ZnSe has been studied by means of cathodoluminescence (CL) in the scanning electron microscope SEM, high resolution electron microscopy (HRTEM) and X‐ray diffraction (XRD). For the CL measurements the samples were pressed to form disk shaped pellets. Changes observed in the relative intensities of the characteristic emission bands are discussed in terms of defects generated during milling. The crystallinity of milled powders has been studied by HRTEM. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Fabrication of low dimensional structures of ZnSe and ZnO by thermal and mechanical methods

“…1b). The luminescent properties of the material are similar to those reported for ball milled material [16], though the defect contribution is lower in the VS grown material. In the case of ZnO, many works report on a great variety of elongated structures [20][21][22][23] In the present work, and far from the gas inlet, prismatic crystals are mostly obtained.…”

“…As reported in many other materials ( [7,9,16], and references therein) the milling process in this work produces particles of a wide range of sizes, from several hundreds of nanometres down to several tens of nanometres. These particles are composed of crystallites of a few nanometres in size as previously observed by transmission electron microscopy [16].…”

“…These particles are composed of crystallites of a few nanometres in size as previously observed by transmission electron microscopy [16]. The behaviour under milling differs slightly from one to another material, and some common important features can be extracted.…”

“…On the other hand, it is known that the smallest grain size attainable by deformation is about 10 nm [17,18] so a compromise must be reached to avoid the presence of large amorphous regions without a substantial decrease of crystallite size. In a previous work these process has been monitored by HRTEM and CL measurements [16]. According to the results presented in those works relaxation effects should also be taken into account [11].…”