High Quantum Efficiency of Band-Edge Emission from ZnO Nanowires

被引：87

作者：

Gargas, Daniel J. ^{[1
]}

Gao, Hanwei ^{[1
]}

Wang, Hungta ^{[1
]}

Yang, Peidong ^{[1
,2
]}

机构：

[1] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA

[2] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA

来源：

NANO LETTERS | 2011年 / 11卷 / 09期

关键词：

Zinc oxide; nanowire; quantum efficiency; photoluminescence; extraction; power dependent;

D O I：

10.1021/nl201850k

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

External quantum efficiency (EQE) of photoluminescence as high as 20% from isolated ZnO nanowires were measured at room temperature. The EQE was found to be highly dependent on photoexcitation density, which underscores the importance of uniform optical excitation during the EQE measurement. An integrating sphere coupled to a microscopic imaging system was used in this work, which enabled the EQE measurement on isolated ZnO nanowires. The EQE values obtained here are significantly higher than those reported for ZnO materials in forms of bulk, thin films or powders. Additional insight on the radiative extraction factor of one-dimensional nanostructures was gained by measuring the internal quantum efficiency of individual nanowires. Such quantitative EQE measurements provide a sensitive, noninvasive method to characterize the optical properties of low-dimensional nanostructures and allow tuning of synthesis parameters for optimization of nanoscale materials.

引用

页码：3792 / 3796

页数：5

共 18 条

[1] High internal quantum efficiency ZnO nanorods prepared at low temperature [J].

Chen, Jie ;

Ae, L. ;

Aichele, Ch. ;

Lux-Steiner, M. Ch. .

APPLIED PHYSICS LETTERS, 2008, 92 (16)

[2] Effects of reabsorption and spatial trap distributions on the radiative quantum efficiencies of ZnO [J].

Foreman, J. V. ;

Everitt, H. O. ;

Yang, J. ;

McNicholas, T. ;

Liu, J. .

PHYSICAL REVIEW B, 2010, 81 (11)

[3] Influence of temperature and photoexcitation density on the quantum efficiency of defect emission in ZnO powders [J].

Foreman, J. V. ;

Everitt, H. O. ;

Yang, J. ;

Liu, J. .

APPLIED PHYSICS LETTERS, 2007, 91 (01)

[4] MEASUREMENT OF ABSOLUTE PHOTOLUMINESCENCE QUANTUM EFFICIENCIES IN CONJUGATED POLYMERS [J].

GREENHAM, NC ;

SAMUEL, IDW ;

HAYES, GR ;

PHILLIPS, RT ;

KESSENER, YARR ;

MORATTI, SC ;

HOLMES, AB ;

FRIEND, RH .

CHEMICAL PHYSICS LETTERS, 1995, 241 (1-2) :89-96

[5] Absolute external luminescence quantum efficiency of zinc oxide [J].

Hauser, Mario ;

Hepting, Alexander ;

Hauschild, Robert ;

Zhou, Huijuan ;

Fallert, Johannes ;

Kalt, Heinz ;

Klingshirn, Claus .

APPLIED PHYSICS LETTERS, 2008, 92 (21)

[6] Semiconductor Nanowires for Energy Conversion [J].

Hochbaum, Allon I. ;

Yang, Peidong .

CHEMICAL REVIEWS, 2010, 110 (01) :527-546

[7] Room-temperature ultraviolet nanowire nanolasers [J].

Huang, MH ;

Mao, S ;

Feick, H ;

Yan, HQ ;

Wu, YY ;

Kind, H ;

Weber, E ;

Russo, R ;

Yang, PD .

SCIENCE, 2001, 292 (5523) :1897-1899

[8] Complete composition tunability of InGaN nanowires using a combinatorial approach [J].

Kuykendall, Tevye ;

Ulrich, Philipp ;

Aloni, Shaul ;

Yang, Peidong .

NATURE MATERIALS, 2007, 6 (12) :951-956

[9] LUMINESCENCE STUDIES OF OPTICALLY PUMPED QUANTUM WELLS IN GAAS-ALXGA1-XAS MULTILAYER STRUCTURES [J].

MILLER, RC ;

KLEINMAN, DA ;

NORDLAND, WA ;

GOSSARD, AC .

PHYSICAL REVIEW B, 1980, 22 (02) :863-871

[10] Excitonic structure and absorption coefficient measurements of ZnO single crystal epitaxial films deposited by pulsed laser deposition [J].

Muth, JF ;

Kolbas, RM ;

Sharma, AK ;

Oktyabrsky, S ;

Narayan, J .

JOURNAL OF APPLIED PHYSICS, 1999, 85 (11) :7884-7887

← 1 2 →