Greetings everyone, hope you are all doing well. I just want a clear definition about how we can analyze the structural morphology of RE doped phosphors with powder XRD and what are all the significant changes that we can observe from the XRD data of the material as the concentration of RE varies, like structural phase transitions.
Stay healthy and Thank you
Dear Evangelin,
Good question! Powder XRD is first of all used to investigate whether as-prepared phosphor powder samples are of single phase. Impurity phases will reduce the photoluminescence quantum yield, which is an important performance figure of luminescent materials, and must be avoided! Moreover, you can investigate the effect of the doping of the activator into the host material on the lattice parameter, i.e. the cell constants. Finally, for nanoscale phosphors, you might use the Scherrer formula to derive the size of the sub-micrometre crystallites by the broadening of a peak in a diffraction pattern.
Hope that helps a bit,
Thomas
Hi
When we analyse the material you can get peak difference . The difference may be in hight and width. In your case the width may be thiner than previous. As DR.thomas said use Sherrer formula for calculating the crystallite size.
Note: Crystallite size is not particle size.
Best
Dr. Arun
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