Morphology and optical properties of Mg and Sr doped CaF2 nanocrystals

OPTICS COMMUNICATIONS

卷:285

Article

Pandurangappa, C.¹  Lakshminarasappa, B. N.² 

[1] RNS Inst Technol, Dept Phys, Bangalore 560061, Karnataka, India

[2] Bangalore Univ, Dept Phys, Bangalore 560056, Karnataka, India

关键词: Chemical synthesis;    Defects;    X-ray diffraction;    Optical properties;    Electron microscopy;    Luminescence;   

DOI  :  10.1016/j.optcom.2012.01.054

来源: Elsevier

【 摘 要 】

Magnesium (Mg) and Strontium (Sr) doped Calcium fluoride nanocrystals were synthesized by co-precipitation method. The cubic structure of the samples was confirmed by Powder X-ray diffraction. The average crystallite size of Mg doped samples was found to be similar to 25 nm whereas in Sr doped one it was similar to 35 nm. The morphological features revealed that the nanocrystals were agglomerated, crispy and porous. The as-prepared samples showed the presence of hydroxyl groups. The optical absorption spectrum of as-prepared Mg doped samples showed a strong absorption band peaked at similar to 233 nm whereas the Sr doped one showed a prominent absorption peak at 248 nm. A strong PL emission was observed at similar to 300 nm in Mg doped samples. However, the Sr doped samples showed two prominent emissions at similar to 345 and 615 nm. (C) 2012 Elsevier B.V. All rights reserved.

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