Zhang Jun, Li Qian, Di Xiaowei, Liu Zhiliang, Xu Gang
College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, Inner Mongolia 010021, People's Republic of China. State Key Laboratory of Transducer Technology, Chinese Academy of Science, Shanghai 200050, People's Republic of China.
Nanotechnology. 2008 Oct 29;19(43):435606. doi: 10.1088/0957-4484/19/43/435606. Epub 2008 Sep 22.
Multicolored semiconductor quantum dots have shown great promise for construction of miniaturized light-emitting diodes with compact size, low weight and cost, and high luminescent efficiency. The unique size-dependent luminescent property of quantum dots offers the feasibility of constructing single-color or full-color output light-emitting diodes with one type of material. In this paper, we have demonstrated the facile fabrication of blue-, green-, red- and full-color-emitting semiconductor quantum dot optical films via a layer-by-layer assembly technique. The optical films were constructed by alternative deposition of different colored quantum dots with a series of oppositely charged species, in particular, the new use of cationic starch on glass substrates. Semiconductor ZnSe quantum dots exhibiting blue emission were deposited for fabrication of blue-emitting optical films, while semiconductor CdTe quantum dots with green and red emission were utilized for construction of green- and red-emitting optical films. The assembly of integrated blue, green and red semiconductor quantum dots resulted in full-color-emitting optical films. The luminescent optical films showed very bright emitting colors under UV irradiation, and displayed dense, smooth and efficient luminous features, showing brighter luminescence in comparison with their corresponding quantum dot aqueous colloid solutions. The assembled optical films provide the prospect of miniaturized light-emitting-diode applications.
多色半导体量子点在构建尺寸紧凑、重量轻、成本低且发光效率高的小型化发光二极管方面展现出了巨大的潜力。量子点独特的尺寸依赖性发光特性为用一种材料构建单色或全色输出发光二极管提供了可行性。在本文中，我们通过逐层组装技术展示了蓝色、绿色、红色和全色发光半导体量子点光学薄膜的简便制备方法。这些光学薄膜是通过将不同颜色的量子点与一系列带相反电荷的物质交替沉积而成的，特别是阳离子淀粉在玻璃基板上的新应用。展示蓝色发射的半导体ZnSe量子点被沉积用于制备蓝色发光光学薄膜，而具有绿色和红色发射的半导体CdTe量子点则用于构建绿色和红色发光光学薄膜。集成的蓝色、绿色和红色半导体量子点的组装产生了全色发光光学薄膜。这些发光光学薄膜在紫外线照射下呈现出非常明亮的发光颜色，并显示出密集、光滑和高效的发光特性，与它们相应的量子点水胶体溶液相比发光更亮。组装好的光学薄膜为小型化发光二极管的应用提供了前景。
