Anomalous power dependence of upconversion emissions in Gd2O3: Er3+ nanocrystals under diode laser excitation of 970 nm

被引：40

作者：

Chen, G. Y. ^{[1
]}

Liang, H. J. ^{[1
]}

Liu, H. C. ^{[1
]}

Somesfalean, G. ^{[1
]}

Zhang, Z. G. ^{[1
]}

机构：

[1] Harbin Inst Technol, Dept Phys, Harbin 150001, Peoples R China

来源：

JOURNAL OF APPLIED PHYSICS | 2009年 / 105卷 / 11期

关键词：

ER3+-ZRO2 NANOCRYSTALS; Y2O3; NANOCRYSTALS; LI+ IONS; LUMINESCENCE; GREEN; BLUE; NANOPHOSPHORS; FLUORESCENCE; TRANSPARENT; ULTRAVIOLET;

D O I：

10.1063/1.3078814

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Visible green and red upconversion (UC) emissions with anomalous power dependence were observed in Gd2O3: Er3+ nanocrystals at room temperature under diode laser excitation of 970 nm. The green and red UC radiations both yield an "s"-shape power dependence, in marked contrast to the quadratic ones of the bulk counterparts. A closed positive looping UC mechanism that differs from conventional PA mechanism is proposed to explain the observed five- or six-photon processes in the "s"-shape power dependence. Power dependence analysis of the 1.55 mu m emissions from the I-4(13/2) state experimentally demonstrates our proposed model. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3078814]

引用

页数：5

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