Luminescence studies and effect of etching on cerium-doped CaS nanoparticles

• Published in: Radiation effects and defects in solids Vol. 164; no. 12; pp. 763 - 770
• Main Authors: Sharma, Geeta, Chawla, Puja, Lochab, S. P., Singh, Nafa
• Format: Journal Article
• Language: English
• Published: Abingdon Taylor & Francis 01-12-2009; Taylor & Francis Ltd
• Subjects: Chemical synthesis; electron microscopy; Etching; Luminescence; luminescent properties; Nanoparticles; optical properties; Spectrum analysis; structural properties
• ISSN: 1042-0150; 1029-4953
• DOI: 10.1080/10420150903401648

Cerium-doped calcium sulphide nanoparticles were synthesized using the solid state diffusion method. The formed nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), UV-visible absorption spectroscopy and photoluminescence (PL) spectroscopy. The XRD pattern confirmed a cubic CaS phase with an average grain size of 53 nm of the formed samples. The TEM image showed non-agglomerated particles with an average size of 60 nm, which is in close agreement with the XRD result. The PL-emission spectrum showed peaks at 506 and 565 nm due to the transition from the excited state to the ground state of Ce
3+
. The effect of etching has been studied on the luminescent properties of CaS:Ce phosphors. With an increase in the etching time there is decrease in the size of the particles, as a result of which the PL spectrum showed a slight blue shift. The UV-visible absorption spectrum also showed a blue shift with an increase in etching time, which is in agreement with the nanosize effect.