Structural and photo luminescent properties of uncapped nanocrystalline Cd1−xZnxS solid solutions

✍ Scribed by Sonia Arora; S. Sundar Manoharan

• Book ID: 103876532
• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 578 KB
• Volume: 31
• Category: Article
• ISSN: 0925-3467
• DOI: 10.1016/j.optmat.2008.02.011

✦ Synopsis

Uncapped nanocrystalline Cd 1Àx Zn x S (0.0 6 x P 0.5) solid solution prepared by microwave assisted combustion route shows hexagonal to cubic phase transformation for even low doping of zinc up to 5 at.% as evident from the X-ray diffraction patterns and the selected area electron diffraction patterns. The solid solutions show a considerable shift in the optical absorption edge from $2.43 eV (CdS) to $2.73 eV for the equi-atomic composition (Cd 0.5 Zn 0.5 S). The blue emission in CdS shows effect of quantum confinement. The photo luminescence spectra of Zn lean compositions (up to 5 at.%) show emergence of a peak at k $ 530 nm along with the blue emission features of CdS. However, solid solutions with higher zinc content (up to 50 at.%), show a systematic increase in the intensity of peak at 530 nm with a blue shift up to 30 at.% of zinc doping. Beyond 30%, a broad blue-green emission with full width at half maxima of $100 nm for Cd 0.5 Zn 0.5 S is observed.