Hu J, Yang W, Manna L, Alivisatos A P
Department of Chemistry, University of California at Berkeley, Berkeley, CA 94720, USA.
Science. 2001 Jun 15;292(5524):2060-3. doi: 10.1126/science.1060810. Epub 2001 May 3.
Colloidal quantum rods of cadmium selenide (CdSe) exhibit linearly polarized emission. Empirical pseudopotential calculations predict that slightly elongated CdSe nanocrystals have polarized emission along the long axis, unlike spherical dots, which emit plane-polarized light. Single-molecule luminescence spectroscopy measurements on CdSe quantum rods with an aspect ratio between 1 and 30 confirm a sharp transition from nonpolarized to purely linearly polarized emission at an aspect ratio of 2. Linearly polarized luminescent chromophores are highly desirable in a variety of applications.
硒化镉（CdSe）胶体量子棒呈现出线性偏振发射。经验赝势计算预测，与发射平面偏振光的球形量子点不同，略微拉长的CdSe纳米晶体沿长轴具有偏振发射。对长径比在1到30之间的CdSe量子棒进行的单分子发光光谱测量证实，在长径比为2时，会从非偏振发射急剧转变为纯线性偏振发射。线性偏振发光发色团在各种应用中非常有用。
