Photoluminescence and time-resolved photoluminescence of star-shaped ZnO nanostructures

被引：21
作者：
Li, C. P.
Guo, L. [1 ]
Wu, Z. Y.
Ren, L. R.
Ai, X. C.
Zhang, J. P.
Lv, Yz.
Xu, H. B.
Yu, D. P.
机构：
[1] Beijing Univ Aeronaut & Astronaut, Sch Mat Sci & Engn, Beijing 100083, Peoples R China
[2] Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China
[3] Chinese Acad Sci, Inst Chem, Beijing 100080, Peoples R China
[4] Peking Univ, Sch Phys, Electron Microscopy Lab, Beijing 100871, Peoples R China
[5] Peking Univ, Sch Phys, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China
来源：
SOLID STATE COMMUNICATIONS | 2006年 / 139卷 / 07期
基金：
中国国家自然科学基金;
关键词：
ZnO; stimulated emission; temperature-dependent photoluminescence; time-resolved photoluminescence;
D O I：
10.1016/j.ssc.2006.06.029
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Optical properties of star-shaped ZnO nanostructures were studied. The temperature-dependent photoluminescence (PL) was examined up to fourth-order longitudinal optical (LO) phonon assisted emissions of free excitons and confirmed that the nature of the room temperature PL in ZnO is 1-LO phonon assisted emission of free excitons. Low threshold ultraviolet stimulated emissions (SE) were obtained for our powder samples at room temperature. Picosecond time-resolved PL measurements detected a bi-exponential decay behavior which is strongly dependent on the excitation intensity: the slow decay term decreased faster than the fast decay term as the excitation intensity increased and the emission decays were dominated by the fast one. We also found that the emission decays decreased super-linearly before the appearance of the SE. This behavior may be used to deduce the threshold of SE or lasing. (c) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码：355 / 359
页数：5
相关论文
共 34 条
[1]   High temperature excitonic stimulated emission from ZnO epitaxial layers [J].
Bagnall, DM ;
Chen, YF ;
Zhu, Z ;
Yao, T ;
Shen, MY ;
Goto, T .
APPLIED PHYSICS LETTERS, 1998, 73 (08) :1038-1040
[2]   Ultrafast relaxation dynamics of charge carriers relaxation in ZnO nanocrystalline thin films [J].
Bauer, C ;
Boschloo, G ;
Mukhtar, E ;
Hagfeldt, A .
CHEMICAL PHYSICS LETTERS, 2004, 387 (1-3) :176-181
[3]   Nanowire-based dye-sensitized solar cells [J].
Baxter, JB ;
Aydil, ES .
APPLIED PHYSICS LETTERS, 2005, 86 (05) :1-3
[4]   Photoluminescence dynamics in ensembles of wide-band-gap nanocrystallites and powders [J].
Bergman, L ;
Chen, XB ;
Morrison, JL ;
Huso, J ;
Purdy, AP .
JOURNAL OF APPLIED PHYSICS, 2004, 96 (01) :675-682
[5]   Random laser action in semiconductor powder [J].
Cao, H ;
Zhao, YG ;
Ho, ST ;
Seelig, EW ;
Wang, QH ;
Chang, RPH .
PHYSICAL REVIEW LETTERS, 1999, 82 (11) :2278-2281
[6]   Excitation dynamics in anisotropic nanostructures of star-shaped CdS [J].
Chae, WS ;
Shin, HW ;
Lee, ES ;
Shin, EJ ;
Jung, JS ;
Kim, YR .
JOURNAL OF PHYSICAL CHEMISTRY B, 2005, 109 (13) :6204-6209
[7]   Time-resolved photoluminescence study of a ZnO thin film grown on a (100) silicon substrate [J].
Guo, B ;
Ye, ZZ ;
Wong, KS .
JOURNAL OF CRYSTAL GROWTH, 2003, 253 (1-4) :252-257
[8]   Synthesis and evolution of rod-like nano-scaled ZnC2O4•2H2O whiskers to ZnO nanoparticles [J].
Guo, L ;
Ji, YL ;
Xu, HB ;
Wu, ZY ;
Simon, P .
JOURNAL OF MATERIALS CHEMISTRY, 2003, 13 (04) :754-757
[9]   Regularly shaped, single-crystalline ZnO nanorods with wurtzite structure [J].
Guo, L ;
Ji, YL ;
Xu, HB ;
Simon, P ;
Wu, ZY .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2002, 124 (50) :14864-14865
[10]   Ultraviolet lasing and time-resolved photoluminescence of well-aligned ZnO nanorod arrays [J].
Han, XH ;
Wang, GZ ;
Wang, QT ;
Cao, L ;
Liu, RB ;
Zou, BS ;
Hou, JG .
APPLIED PHYSICS LETTERS, 2005, 86 (22) :1-3
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