Optical characterization of ZnO nanobelts
Optical characterization of ZnO nanobelts
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DOI：
10.1007/s10854-006-6943-z
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发表时间：
2006-04-01
影响因子：
2.8
通讯作者：
Kumar, S
中科院分区：
文献类型：
--
作者：
Bhatti, HS;Gupta, A;Kumar, S
以乙酸锌为原料，采用化学沉淀法合成了氧化锌纳米带。扫描电子显微镜观察表明，纳米带的长度从几百微米到几毫米不等。x射线衍射图证实了纤锌矿结构。本文采用氮激光作为激发源（337.1 nm, 10 ns）进行磷光研究。本文根据时间分辨激光诱导光致发光的衰减曲线，计算并报道了ZnO纳米带的爱因斯坦自发和受激系数、振子强度、积分截面和偶极矩等光学参数。从衰变曲线得到的爱因斯坦的自发和受激系数值表明了从各种陷阱跃迁的概率。能级的选择性激发可以使ZnO成为最适合的激光介质。
Zinc oxide nanobelts have been synthesized by chemical precipitation technique using zinc acetate as starting material. Scanning electron microscopy observations indicate that the lengths of nanobelts are ranging from a few hundreds of micrometers to a few millimeters. X-Ray Diffraction pattern confirms the wurtzite structure. Nitrogen laser is employed here as an excitation source (337.1 nm, 10 ns) for phosphorescence Studies. From the decay curves of time resolved laser induced photoluminescence, various optical parameters such as Einstein's spontaneous and stimulated coefficients, oscillator strength, integrated cross-section and dipole-moment of ZnO nanobelts have been calculated and reported in this paper. Einstein's spontaneous and Stimulated coefficient values obtained from the decay curves indicate the probability of transitions from various traps. Selective excitation of the levels can make ZnO as a best Suited laser medium.