论文标题
PBS纳米晶薄膜中的光致发光：纳米晶体密度，膜形态和能量转移
Photoluminescence in PbS nanocrystal thin films: Nanocrystal density, film morphology and energy transfer
论文作者
论文摘要
我们表明，PBS纳米晶薄膜的光致发光特性与膜形态和纳米晶体密度直接相关。在密集的PBS纳米晶体膜中，低温供体到受体能量转移主要负责光致发光光谱狭窄并朝着更长的波长转移。在升高的温度下，提议返回能量转移负责异常的光致发光强度温度依赖性。在PBS纳米晶密度低的薄膜中，能量转移被抑制，并且效果大大降低。
We show that photoluminescence properties of PbS nanocrystal thin films are directly related to film morphology and nanocrystal density. In densely packed PbS nanocrystal films, low-temperature donor-to-acceptor energy transfer is mainly responsible for the photoluminescence spectra narrowing and shift toward longer wavelengths. At elevated temperatures, back energy transfer is proposed to be responsible for an unusual photoluminescence intensity temperature dependence. In thin films with a low PbS nanocrystal density, the energy transfer is suppressed, and the effect is dramatically reduced.
