PHOTOACOUSTIC AND LUMINESCENCE SPECTRA OF CDS FINE PARTICLES
PHOTOACOUSTIC AND LUMINESCENCE SPECTRA OF CDS FINE PARTICLES
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DOI：
10.1143/jjap.26.396
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发表时间：
1987-03-01
期刊：
影响因子：
--
通讯作者：
OGAWA, T
中科院分区：
文献类型：
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作者：
ARAI, T;YOSHIDA, T;OGAWA, T
用光声光谱和荧光光谱研究了CdS微粒中光激发电子弛豫机制的尺寸效应。随着粒径的减小，绿色发光强度（约2.47 eV）降低，并且其峰位置向低能侧移动。出现在较长波长区域的杂质发光，红色发射（1.7 eV），在将颗粒尺寸减小到直径1.40 nm时没有变化那么多。由光声效应确定的小尺寸颗粒在本征能量区的吸收光谱形成了一个长拖尾，向低能侧移动。非辐射复合速率，热弛豫速率，随着颗粒尺寸的减小而增加。这些现象被解释为起源于小尺寸颗粒的表面积与体积比的增加。
Some size effects of the relaxation mechanism of optically excited electrons in CdS fine particles were investigated by means of photoacoustic and luminescence spectroscopies. The intensity of green luminescence (∼ 2.47 eV) decreased and its peak position shifted to the lower-energy side upon decreasing the particle size. The impurity luminescence which appears in the longer-wavelength region, red emission (∼ 1.7 eV), did not vary as much upon decreasing the particle size to∼ 40 nm in diameter. The absorption spectrum in the intrinsic energy region for a small-size particle, which was determined from the photoacoustic effect, formed a long tailing towards the lower-energy side. The non-radiative recombinalion rate, thermal relaxation rate, increases with decreasing particle size. These phenomena were interpreted to originate from the increment of the ratio of the surface to volume in small-size particles.