Influence of Europium Concentration on Optical and Structural Properties of Nanocrystalline GaN :Eu~(3+) Powder

摘要

In this work, GaN nanocrystals doped by europium (III) ions at different concentrations have been synthesized by modified nitridation method at 1050°C temperature. From X-ray diffraction spectra, it has been found that the size of nanocrystals strongly depends on the dopant concentration in a nonlinear way and varying from __20 up to 35 nm when the europium concentration varies from 0.5 up to 2 mol %. Moreover, it has been found that obtained nanocrystals are characterized by two main emission bands, one related to GaN core (___364 nm) and the second to surface/defect states (__600 nm). It has been shown that the relative intensity of these bands varies with changing of the europium concentration due to changes of GaN nanocrystals surface-tovolume ratio.