摘要
根据带隙与吸收光谱的第一吸收峰峰位之间存在的关系,测量了粒子尺寸分别为4.0 nm和2.5 nm的CdSe纳米晶在不同温度下的吸收光谱,找出了吸收光谱第一吸收峰峰位随温度的变化关系,总结出了CdSe纳米晶的带隙随温度的变化关系.结果表明:CdSe纳米晶材料的发光器件的发光颜色取决于它的带隙.
Absorption spectra of 4.0 nm and 2.5 nm CdSe nanocrystals at different temperatures are measured. The position of the band gap absorption peak changes linearly with temperature. The relationship between band gap absorption peak position and band gap energy is obtained experimently, which could show the relationship between band gap energy and temperature. Finally, the temperature dependence of the band gap of CdSe nanocrystals is fitted with a function. The experiment results indicate that the color of the CdSe nanocrystal light-emitting instrument is determined by their band gap.
出处
《物理实验》
北大核心
2009年第6期11-14,共4页
Physics Experimentation
基金
吉林省科技发展计划项目(No.20050541)
关键词
CDSE纳米晶
带隙
温度
CdSe nanocrystals
band gap
temperature