Efficient upconversion of photoluminescence via two-photon absorption in bulk and nanorod ZnO

被引：24

作者：

Chen, S. L. ^{[1
]}

Stehr, J. ^{[1
]}

Reddy, N. Koteeswara ^{[2
]}

Tu, C. W. ^{[2
,3
]}

Chen, W. M. ^{[1
]}

Buyanova, I. A. ^{[1
]}

机构：

[1] Linkoping Univ, Dept Phys Chem & Biol, S-58183 Linkoping, Sweden

[2] Gwangju Inst Sci & Technol, Dept Nanobio Mat & Elect, Kwangju 500712, South Korea

[3] Univ Calif San Diego, Dept Elect & Comp Engn, La Jolla, CA 92093 USA

来源：

APPLIED PHYSICS B-LASERS AND OPTICS | 2012年 / 108卷 / 04期

基金：

瑞典研究理事会;

关键词：

2ND-HARMONIC GENERATION; EXCITON; LUMINESCENCE;

D O I：

10.1007/s00340-012-5138-y

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Efficient upconversion of photoluminescence from donor-bound excitons is revealed in bulk and nanorod ZnO. Based on excitation power-dependent PL measurements performed with different energies of excitation photons, two-photon absorption (TPA) and two-step TPA (TS-TPA) processes are concluded to be responsible for the upconversion. The TS-TPA process is found to occur via a defect/impurity (or defects/impurities) with an energy level (or levels) lying within 1.14-1.56 eV from one of the band edges, without involving photon recycling. One of the possible defect candidates could be V-Zn. A sharp energy threshold, different from that for the corresponding one-photon absorption, is observed for the TPA process and is explained in terms of selection rules for the involved optical transitions.

引用

页码：919 / 924

页数：6

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