Investigation of Z-shaped Photoluminescence of Exciton in ZnO Single-crystal Microtubes

Author

Liu, N. ; Li, Y.R. ; Deng, H. ; Sun, Y.S. ; Zhou, X. ; Wu, H.J.

Author_Institution

School of Microelectronics and Solid State Electronics, University of Electronic Science and Technology of China, People´´s Republic of China, E-mail: liunuo20022@yahoo.com.cn

fYear

2005

fDate

19-21 Dec. 2005

Firstpage

483

Lastpage

486

Abstract

The photoluminescence properties of ZnO single-crystal microtubes grown on Si substrate by hydrothermal method were investigated. An anomalous Z-shaped red-shift was found in the photoluminescence spectra, implying a new temperature switch characteristics. These results are considered to be from the competition among three kinds of excitons, which are localized excitons due to trapping in the intrinsic impurities and interface states at low temperatures; localized excitons and bound from thermally activated and transferred into bound states at intermediate temperatures; and, free excitons and unknown exciton complexes by thermal energy (kT) transfer part of the bound excitons into free excitons at high temperatures. As a result, free excitonsand interface states-excitons strongly overlaped.

Keywords

Diffraction; Electrons; Excitons; Optical modulation; Photoluminescence; Quantum dot lasers; Substrates; Sun; Temperature dependence; Zinc oxide;

fLanguage

English

Publisher

ieee

Conference_Titel

Electron Devices and Solid-State Circuits, 2005 IEEE Conference on

Print_ISBN

0-7803-9339-2

Type

conf

DOI

10.1109/EDSSC.2005.1635313

Filename

1635313