Effect of Ag doping on the properties of ZnO thin films for UV stimulated emission

被引：7
|
作者：
Razeen, Ahmed S. [1 ]
Gadallah, A. -S. [1 ]
El-Nahass, M. M. [2 ]
机构：
[1] Cairo Univ, Natl Inst Laser Enhanced Sci Laser Sci & Interact, Giza, Egypt
[2] Ain Shams Univ, Phys Dept, Fac Educ, Cairo, Egypt
来源：
PHYSICA B-CONDENSED MATTER | 2018年 / 538卷
关键词：
Ag doping; Stimulated emission; ZnO thin films; Sol-gel spin coating; MOLECULAR-BEAM EPITAXY; OPTICAL-PROPERTIES; RAMAN-SCATTERING; LUMINESCENCE; SILICON; TEMPERATURE; SUBSTRATE; GAN;
D O I：
10.1016/j.physb.2018.03.015
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Ag doped ZnO thin films have been prepared using sol-gel spin coating method, with different doping concentrations. Structural and morphological properties of the films have been investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. Thin films have been optically pumped and stimulated emission has been observed with strong peaks in the UV region. The UV stimulated emission is found to be due to exciton-exciton scattering, and Ag doping promoted this process by increasing the excitons concentrations in the ZnO lattice. Output-input intensity relation and peak emission, FWHM, and quantum efficiency relations with pump intensity have been reported. The threshold for which stimulated emission started has been evaluated to be about 18 MW/cm(2) with quantum efficiency of about 58.7%. Mechanisms explaining the role of Ag in enhancement of stimulated emission from ZnO thin films have been proposed.
引用
收藏
页码：131 / 137
页数：7
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