Influence of ion bombardment on the photoluminescence response of embedded CdS nanoparticles

• Authors: Dambarudhar Mohanta , Fouran Singh , D. Avasthi , Amarjyoti Choudhury
• Languages of publication: EN

Abstracts

EN

Semiconductor nanoparticles (CdS) were fabricated by an inexpensive chemical route using polyvinyl alcohol (PVA) as the dielectric host matrix. Nano-CdS in PVA were subjected to ion irradiation (using oxygen, chlorine and gold) in the medium energy range (80–100 MeV) and under fluence variation of 1011–1013 ions/cm2. The nature of light emission was found to be drastically different in each of the three cases. Photoluminescence spectra of oxygen irradiated samples exhibit band edge emission (2.8 eV) as well as trap related emission (1.76 eV) whereas band edge emission is found to be bleached out for chlorine ion irradiated nano-CdS. The intense broad PL peaks, noticeable in the case of gold ion irradiated samples suggest superposition of the two peaks - namely, band edge emission and trap related emission. Furthermore, in the case of gold ion irradiated nano-CdS, energy shift in the PL spectra reveals variation in size distribution caused by the extra pressure effect of heavy gold ion beams. The mechanism of such a difference as a result of ion irradiation-type and ion-fluence is discussed in detail.

Keywords

EN

Nanoparticles; photoemission; irradiation; 78.67.Bf; 78.66.hf; 78.70-g; 81.05.Dz; 82.35.Np

• Publisher: De Gruyter Open
• Journal: Open Physics
• Year: 2006
• Volume: 4
• Issue: 2
• Pages: 187-195

Dates

published

1 - 6 - 2006

online

1 - 6 - 2006

Contributors

author

Dambarudhar Mohanta

• Department of Physics, Tezpur University, P.O. Napaam, Assam, 784 028, India

author

Fouran Singh

• Inter University Accelerator Centre, Aruna Asaf Ali Marg, P.Box. 10502, New Delhi, 110 067, India

author

D. Avasthi

• Inter University Accelerator Centre, Aruna Asaf Ali Marg, P.Box. 10502, New Delhi, 110 067, India

author

Amarjyoti Choudhury

• Department of Physics, Tezpur University, P.O. Napaam, Assam, 784 028, India

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Identifiers

DOI

10.2478/s11534-006-0006-1