Effect of the Temperature on Absorption and Photoluminescence Spectra of CdSe/ZnS Quantum Dots
Effect of the Temperature on Absorption and Photoluminescence Spectra of CdSe/ZnS Quantum Dots
复制标题
DOI：
--
复制
发表时间：
2008
影响因子：
--
通讯作者：
Zhang Qing-hao
中科院分区：
文献类型：
--
作者：
Zhang Qing-hao
测量了分散在己烷和甲苯溶液中的CdSe/ZnS量子点在不同温度下的吸收光谱和光致发光光谱。通过比较两种类型的硫化镉/硫化锌量子点的光谱特性，讨论了温度对吸收光谱和光致发光光谱的影响。测量结果表明，在25℃~100℃范围内，随着温度的升高，吸收峰波长略有红移(~4 nm)，光致发光峰波长略有红移，但不超过6 nm。根据测量的CdSe/ZnS量子点的光致发光光谱，首次确定了Varshni定律中关于带隙的两个经验系数。测得的吸收能力随温度变化不大，光致发光强度与温度的升高成正比。
The absorption and photoluminescence spectra of the CdSe/ZnS quantum dots dispersed in hexane and toluene solution are measured in different temperatures. Effect of the temperature on the absorption and photoluminescence spectra is discussed by comparing the spectral characteristics of two types of the CdSe/ZnS quantum dots. The measured results indicate that the absorption-peak wavelengths have a slight red shift (~4 nm) as the temperature increases, the photoluminescence-peak wavelengths having a little red shift, but no more than 6 nm as the temperature increases since 25 ℃ to 100 ℃. Two experiential coefficients in Varshni law regarding to bandgaps are determined at the first time according to the measured PL spectra of the CdSe/ZnS quantum dots. The measured abilities of the absorption show a little change with different temperatures, and photoluminescence intensities are proportional to the increase of the temperature.