PROPERTIES OF THE EXCITONIC EMISSION AT ROOM-TEMPERATURE IN CD0.3ZN0.7S/ZNS STRAINED-LAYER SUPERLATTICES

被引:23
作者
TAGUCHI, T
ENDOH, Y
机构
[1] Department of Electrical Engineering, Osaka University, Suita Osaka
来源
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS | 1991年 / 30卷 / 6A期
关键词
EXCITON; CDZNS/ZNS STRAINED-LAYER SUPERLATTICE; HIGH-EXCITATION EFFECT; QUANTUM EFFECT; FORBIDDEN TRANSITION;
D O I
10.1143/JJAP.30.L952
中图分类号
O59 [应用物理学];
学科分类号
摘要
Cd0.3Zn0.7S/ZnS multiple-quantum-well strained-layer superlattices with a range of well widths can produce excitonic emissions around 3.4 eV at room temperature (RT), due to the quantum confinement of excitons in the CdZnS wells. The emission spectra of a 41 angstrom Cd0.3Zn0.7S well were extensively studied under high optical excitation. We found a non-linear dependence of the spontaneous RT exciton-emission intensity on the excitation intensity for high excitations. With increasing excitation density, the emission line moves to slightly the lower-photon energy and in addition its linewidth is broadened. A shoulder on higher-energy side of the excitonic spectrum appears above about 100 kW/cm2, which is related to an optical transition associated with a higher excited-level state of the electrons confined in the conduction-band potential well.
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页码:L952 / L955
页数:4
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