基于宽禁带半导体量子点的高效蓝紫光发光二极管的研制和性能研究

项目名称： 基于宽禁带半导体量子点的高效蓝紫光发光二极管的研制和性能研究

项目编号： No.11274063

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 范吉阳

作者单位： 东南大学

项目金额： 80万元

中文摘要： 半导体量子点发光二极管是当前国际上的研究热点。基于量子点的发光二极管稳定、高效、单色性好、颜色可调、寿命长、节能、体积小，已引起全球科研人员和工业界的高度关注。目前研究较多的是II-VI族化合物半导体量子点发光二极管，但重金属离子的毒性限制了其应用前景。相比之下，IV族半导体量子点生物相容性好且元素储量大。本申请中我们拟研究基于IV族宽禁带半导体碳化硅量子点的发光二极管。碳化硅具有热稳定性和化学稳定性好、抗辐射等许多优点，并且由于量子限制效应很容易实现蓝紫光发射，因而是极具潜力的蓝紫光发光二极管材料。我们利用电化学方法制备碳化硅量子点，并对其进行表面处理，结合能传导载流子的导电聚合物实现多层结构的具有蓝紫光发射的发光二极管，同时结合具有红黄光发射的硅量子点可实现混合量子点准白光发光二极管。重点研究各结构中的能量转移机制、载流子传导机制以及电致发光机制等，探索优化量子点发光二极管性能的方法。

中文关键词： 量子点；电致发光；载流子输运；发光机制；再吸收

英文摘要： The semiconductor quantum dot-based light-emitting diodes (LEDs) have now become the focus of intensive research. These LEDs possess the merits of high stability, high exernal quantum efficiency, pure light color, tunable emission wavelength, long lifetime, energy-saving, and small volume. Hence they have attracted great interest from both the scientific and the industrial communities. The LEDs based on the group II-VI semiconductor quantum dots are the most highly investigated currently; however, the cytotoxicity of the heavy metal ions contained in them greatly hampers their wide applications. In comparison, the group IV semiconductor quantum dots are much more biocompatible and abundant in the earth. Therefore, in this proposed project, we plan to study the LEDs majorly based on the SiC quantum dots. SiC is a wide bandgap semiconductor possessing a variety of excellent properties such as high thermal and chemical stabilities and radiation-resistance. Moreover, blue-violet emissions can readily be implemented by using the SiC quantum dots due to their wide bandgap according to quantum confinement effect. Hence the SiC quantum dots are perfect candidates of basic componnets for blue-violet emitting LEDs. We shall fabricate the SiC quantum dots by using the electrochemical method and then link them with surface

英文关键词： Quantum dot；Electroluminescence；Carrier transport；Luminescence mechanism；Reabsorption