Observation of dark exciton luminescence from ZnO nanocrystals in the quantum confinement regime

被引：10

作者：

Yamamoto, Sekika ^{[1
]}

Mishina, Tomobumi ^{[1
]}

机构：

[1] Hokkaido Univ, Dept Phys, Grad Sch Sci, Sapporo, Hokkaido 0600810, Japan

来源：

PHYSICAL REVIEW B | 2011年 / 83卷 / 16期

关键词：

NANOPARTICLES; DOTS; PHOTOLUMINESCENCE; TRANSITION; PARTICLES; LIFETIME; DECAY;

D O I：

10.1103/PhysRevB.83.165435

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Time-resolved luminescence measurements are performed on high-quality ZnO nanocrystals in a quantum confinement regime prepared by fast cooling and succeeding surface passivation. A very long luminescence lifetime of similar to 0.1 mu s, which is indicative of the existence of a dark exciton state, is observed. The temperature dependence of the lifetime and the luminescence peak energy is successfully accounted for by a thermal equilibrium model of excitonic dark and bright states.

引用

页数：7

共 27 条

[1] Conventional Optics from Unconventional Electronics in ZnO Quantum Dots [J].

Baskoutas, Sotirios ;

Bester, Gabriel .

JOURNAL OF PHYSICAL CHEMISTRY C, 2010, 114 (20) :9301-9307

[2]

BOER KW, 1990, SURVEY SEMICONDUCTOR, P517

[3] Solid-state dye-sensitized solar cells based on ZnO nanocrystals [J].

Boucharef, M. ;

Di Bin, C. ;

Boumaza, M. S. ;

Colas, M. ;

Snaith, H. J. ;

Ratier, B. ;

Boucle, J. .

NANOTECHNOLOGY, 2010, 21 (20)

[4] Multiple temperature regimes of radiative decay in CdSe nanocrystal quantum dots: Intrinsic limits to the dark-exciton lifetime [J].

Crooker, SA ;

Barrick, T ;

Hollingsworth, JA ;

Klimov, VI .

APPLIED PHYSICS LETTERS, 2003, 82 (17) :2793-2795

[5] Size- and temperature-dependence of exciton lifetimes in CdSe quantum dots [J].

Donega, C. de Mello ;

Bode, M. ;

Meijerink, A. .

PHYSICAL REVIEW B, 2006, 74 (08)

[6] Band-edge exciton in quantum dots of semiconductors with a degenerate valence band: Dark and bright exciton states [J].

Efros, AL ;

Rosen, M ;

Kuno, M ;

Nirmal, M ;

Norris, DJ ;

Bawendi, M .

PHYSICAL REVIEW B, 1996, 54 (07) :4843-4856

[7] Radiative lifetime of excitons in ZnO nanocrystals: The dead-layer effect [J].

Fonoberov, VA ;

Balandin, AA .

PHYSICAL REVIEW B, 2004, 70 (19) :1-5

[8] Highly monodisperse polymer-capped ZnO nanoparticles: Preparation and optical properties [J].

Guo, L ;

Yang, SH ;

Yang, CL ;

Yu, P ;

Wang, JN ;

Ge, WK ;

Wong, GKL .

APPLIED PHYSICS LETTERS, 2000, 76 (20) :2901-2903

[9] Solution-processed ultraviolet photodetedtors based on colloidal ZnO nanoparticles [J].

Jin, Yizheng ;

Wang, Jianpu ;

Sun, Baoquan ;

Blakesley, James C. ;

Greenham, Neil C. .

NANO LETTERS, 2008, 8 (06) :1649-1653

[10] A 5% efficient photo electrochemical solar cell based on nanostructured ZnO electrodes [J].

Keis, K ;

Magnusson, E ;

Lindström, H ;

Lindquist, SE ;

Hagfeldt, A .

SOLAR ENERGY MATERIALS AND SOLAR CELLS, 2002, 73 (01) :51-58

← 1 2 3 →