Impurity and morphological dependence on photoluminescence and enhanced impurity-induced two-photon absorption in ZnO

被引：4

作者：

Clark, Daniel J. ^{[1
]}

Yuan, Lu ^{[2
]}

Otieno, Calford O. ^{[1
]}

Zhou, Guangwen ^{[2
]}

Jang, Joon I. ^{[1
]}

机构：

[1] SUNY Binghamton, Dept Phys Appl Phys & Astron, Binghamton, NY 13902 USA

[2] SUNY Binghamton, Dept Mech Engn, Binghamton, NY 13902 USA

来源：

SOLID STATE COMMUNICATIONS | 2014年 / 181卷

基金：

美国国家科学基金会;

关键词：

ZnO; Exciton; Photoluminescence; Nonlinear optics; THIN-FILMS; STIMULATED-EMISSION; NANOWIRES; TETRAPODS; OXIDATION; CELLS;

D O I：

10.1016/j.ssc.2013.11.020

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

In this study, we characterize the relative crystal quality of zinc oxide (ZnO) synthesized at various temperatures via photoluminescence (PL) measurements. By varying the oxidation temperature during the growth process, different sample morphologies arise. These structural differences cause changes in the PL spectra which allow us to gain insight into the crystal purity. We employ three independent spectroscopic methods to examine ZnO prepared with various morphologies; time-integrated PL, random lasing, and time-resolved PL. As a result of the impurity band being resonant with the two-photon absorption (2PA) range, multifold enhanced 2PA is observed and the 2PA coefficient is measured to be 2500 cm/GW for tetrapod ZnO at 613 nm. (C) 2013 Elsevier Ltd. All rights reserved,

引用

页码：9 / 14

页数：6

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