Photoluminescence and thermoluminescence of ZnO nano-needle arrays and films

被引：25

作者：

Secu, C. E. ^{[1
]}

Sima, Mariana ^{[1
]}

机构：

[1] Natl Inst Mat Phys, Bucharest 77125, Romania

来源：

OPTICAL MATERIALS | 2009年 / 31卷 / 06期

关键词：

ZnO nano-needles; Photoluminescence; Thermoluminescence; Surface states; NANONEEDLE ARRAYS; FABRICATION; NANOPARTICLES; LUMINESCENCE;

D O I：

10.1016/j.optmat.2008.10.025

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

ZnO nano-needle arrays and films have been prepared by anodic etching of ZnO foil at constant current in potassium zincate solution and sodium hydroxide alcoholic solution, respectively. Photoluminescence (PL) spectra recorded on ZnO nano-needles have shown a broad band at 585 nm due to the native oxygen defects incorporated during the synthesis processes; in a ZnO film-type sample this band is replaced by another one at 432 nm. Thermoluminescence (TL) glow curves recorded on ZnO nano-needle arrays have shown a broad peak at about 360 degrees C similar to that observed in ZnO polycrystalline powder. A very strong TL peak at about 325 degrees C superimposed on a broad one has been observed in a ZnO film-type sample. TL recorded on ZnO nano-needles has tentatively been attributed to the recombination of charge carriers released from the surface states associated with oxygen defects, mainly interstitial oxygen ion centres; the TL mechanism is supported by a recovery effect of the PL and TL after storage in air. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：876 / 880

页数：5

共 16 条

[1] Spatial confinement of laser light in active random media [J].