白光LED用金、银纳米粒子敏化增强碳量子点发光玻璃的研究

项目名称： 白光LED用金、银纳米粒子敏化增强碳量子点发光玻璃的研究

项目编号： No.51472183

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 一般工业技术

项目作者： 向卫东

作者单位： 温州大学

项目金额： 86万元

中文摘要： 本项目采用热注入和热解等方法制备在紫光和蓝光激发下能发射白光且量子产率高的水溶性碳量子点，与分别含有Au和Ag的先驱体溶液混合，用溶胶-凝胶法制备含有金属敏化增强白光发射碳量子点钠硼硅玻璃，分别与蓝光芯片和紫光芯片复合制备出白光LED光源。采用吸收光谱、单光子荧光光谱技术、时间分辨荧光技术、变温荧光光谱等技术研究前驱体的种类、比例、反应温度、表面修饰剂等因素对碳量子点白光发光效率的影响；通过调节先驱体的种类、升温速率、保温时间调控干凝胶微孔结构尺寸分布，在孔壁中形成具有单分散、高浓度、均匀掺杂的碳量子点；采用XRD、SEM、HR-TEM等手段研究金属敏化碳量子点在玻璃中的形成机理；研究碳量子点组成、结构、尺寸以及表面态与金属的耦合关系对白光LED光源的光效、色温、显色指数、光衰等光学性质的影响，结合理论模型计算，建立碳量子点的发光机制；实现金属敏化增强碳量子点在玻璃中的可控生长。

中文关键词： 白光LED；碳量子点；Au/Ag纳米粒子；发光玻璃；溶胶凝胶法

英文摘要： The soluble carbon quantum dots with high quantum yield and emitting white light excited by the violet light and blue light will be synthesized by the method of hot injection and pyrolyzation etc. Metal sensitized carbon quantum dots doping sodium borosilicate glass for white LEDs will be prepared via sol-gel method by mixing the precursor solution containing noble metal Au, Ag with the soluble carbon QDs. Then, the as obtained glass is composited with the blue light chip and the violet light chip to prepare white LEDs source. The effect of species and ratio of precursor, surface modifying agent,reaction temperature on the luminescence efficiency of the carbon quantum dots are investigated by absorption spectroscopy, single-photon fluorescence spectroscopy, time-resolved fluorescence technique etc.The pore structure and size distribution of the dry sodium borosilicate gel can be controlled by sintering reaction temperature.The narrow distribution and high concentrations of carbon quantum dots uniformly dispersed in the pore wall can be obtained by varying the type of precursor, sintering reaction temperature,heating rate and holding time, The formation mechanism of metal sensitized carbon quantum dots in the glass is investigated by XRD, SEM, HRTEM. Meanwhile,the effect of the composition, structure, size and the surface states of carbon quantum dots coupling with metals on luminous efficiency, color temperature, color rendering index, decay of white LED light source are studied. Finally, the light emitting mechanism of carbon quantum dots is created combined with the theoretical model, and the noble metal Au, Ag sensitized carbon quantum dots doping sodium borosilicate glass for white LEDs could be grow controllably.

英文关键词： W-LED;Carbon quantum dot;Au/Ag nanoparticle;photoluminescence glass;sol-gel method