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Photoluminescent properties of doped ZnO nanopowders

Bohdan K. Kotlyarchuk 1Bohdan K. Ostafiychuk 3Dmytro I. Popovych 1,2Andrew S. Serednytski 1

1. Institute of Applied Problems of Mechanics and Mathematics (IAPMM), 3B Naukova Str., Lviv 79060, Ukraine
2. National University "Lvivska Polytechnika", Bendera St. 12, Lviv UA-79013, Ukraine
3. Precarpathian National University named after Vasyl Stefanyk, 57 Shevchenko, Ivano-Frankivsk 76025, Ukraine

Abstract

Zinc oxide is one of the most important II-IV compound semiconductors with a wide bandgap of about 3.37 eV at room temperature which can be used in a number of optoelectronic devices (UV photodetectors, light emitting diodes, laser diodes, gas-sensors) [1].

This work is devoted to experimental research of the photoluminescence features of ZnO nanopowder (d~30÷40 nm) doped by impurities of  Mn, Ti, Cr, V (~2÷3 at. %). Doping was accomplished by the method of  thin film (h~5÷8 nm) laser deposition  of the doping material onto nanopowder followed by  laser implantation and activation of the doping impurity [2].

For initial ZnO at a room temperature intensive ultraviolet (λmax=387 nm) and yellow-orange luminescence (λmax=600 nm)  was observed and also a weak radiation in the green range  of the spectrum (λmax=510 nm). A decrease of the intensity of the yellow luminescence in comparison with undoped material and the occurrence of a new luminescence maximum (λmax=535 nm) in zinc oxide doped by Cr and Ti has been observed .  In  ZnO:Ti appears also a green luminescence with λmax=525 nm, which could be the result of a formation of TiO2 particles in the nanopowder . Doping of zinc oxide by Mn and V leads to a significant  increase of the intensity of the yellow luminescence which can be  used effectively for the increase of the sensitivity in  gas detection.

[1] Zinc Oxide Bulk, Thin Films and Nanostructures. Processing, Properties and Applications. Edited by: Chennupati Jagadish and Stephen Pearton (2006).

[2] В.K.Kotlyarchuk, D.I.Popovych, A.S.Serednytski, I.F.Myronyuk. Features of Photoluminescent Properties of Doped ZnO Nanopowders // COLA 2007, 9th International Conference on Laser Ablation, September 24-28, 2007, Tenerife, Spain, PTU-73.

 

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Presentation: Poster at E-MRS Fall Meeting 2008, Symposium F, by Dmytro I. Popovych
See On-line Journal of E-MRS Fall Meeting 2008

Submitted: 2008-05-19 11:58
Revised:   2009-06-07 00:48