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Photoluminescence And Ultraviolet Photoresponse In ZnO Nanophorsphors Prepared By Thermal Decomposition Of Zinc Acetate

Sheo K. Mishra, Smriti Srivastava, Rajneesh K. Srivastava, A.C. Panday, S.G. Prakash

Volume 2, Issue 4, Page 298-302, Year 2011 | DOI: 10.5185/amlett.indias.210

Keywords:

Photoconductivity, XRD, ZnO, nanophosphors

Abstract: 

In the present work, simple, low-cost, and direct route is used for the UV- photodetection and photoluminescent zinc-oxide nanoparticles (NPs) by decomposing zinc acetate in air at 400 0C for 12 hrs. The X-ray diffraction (XRD) result indicates that the synthesized ZnO NPs is pure and single crystalline structure with wurtzite type.  The crystallite size of the ZnO nanoparticles is in the range of 20–50 nm and average crystallite size of synthesized nanoparticles is found to be ~33 nm. The synthesized ZnO NPs exhibits several photoluminescence peaks centered at 396 nm, 418 nm, 441 nm, 481 nm and 522 nm. The time-resolved rise and decay of photocurrent spectrum shows initial significant increase in photocurrent and, subsequently falls gradually under UV-illumination. The photocurrent abruptly falls when illumination is turned off. The variation of photo and dark-current with applied field is found to follow power law i.e I α V. At low voltage the behavior is sub-linear which becomes super-linear at high voltages. The ZnO NPs is found to have double traps of 0.59 eV and 0.67 eV. Copyright © 2011 VBRI press.

 

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