Abstract:

White LED (light-emitting diode) is known as the fourth-generation solid-state lighting source due to its excellent luminous performance. By taking quantum efficiency as the core parameter and warm white light as the ultimate goal, this paper reviews and summarizes the research on rare earth doped tricolor (red, green and blue) inorganic phosphors and single matrix single doped, co-doped and multi-doped warm white phosphors. The results show that Eu²⁺ and Ce³⁺ are the main active ions of high quantum efficiency near UV excited blue phosphor, Tb³⁺ and Eu²⁺ are the main active ions of green phosphor, and Eu³⁺ and Eu²⁺ are the main active ions of red phosphor. The existing single substrate warm white phosphors still have many technical bottlenecks, such as insufficient red light, low color rendering index, low quantum efficiency and so on. Based on the literatures, it is proposed to prepare a single matrix white phosphor from the existing high-efficiency red powder, so as to eliminate the lack of red component in the spectrum, and appropriately introduce transition metal elements other than Mn. At the same time, strengthen the research on the kinetic theory of the matrix and the kinetic theory of the electronic coupling between the matrix and the rare earth. It is hoped that the design calculation and controllable preparation of rare earth doped inorganic phosphors can be realized.

Key words: near ultraviolet excitation, single matrix phosphors, radiation, kinetic theory, synthesis

摘要：

白光LED （light-emitting diode）因其优异的发光性能被誉为是第四代固体照明光源。本文以量子效率作为核心参数，以暖白光为最终目标，分别对蓝、绿、红三基色稀土掺杂无机荧光粉和单一基质单掺、共掺、多掺的暖白光荧光粉的研究现状进行调研。结果表明，高量子效率的近紫外激发蓝色荧光粉其激活离子主要为Eu²⁺、Ce³⁺，绿色荧光粉为Tb³⁺和Eu²⁺，红色荧光粉为Eu³⁺和Eu²⁺。现有的单一基质暖白光荧光粉仍然存在诸多技术瓶颈，如：红光不足、显色指数偏低、量子效率偏低等。基于此，建议从已有的高效红粉出发制备单一基质白光荧光粉，以消除光谱中缺乏红色成分这一难题，并适当引入除Mn之外的过渡金属元素，同时加强对基质动力学理论，以及基质和稀土之间的电子耦合作用动力学理论的研究，期望能实现稀土掺杂无机荧光粉的设计计算与可控制备。

关键词: 近紫外激发, 单一基质荧光粉, 辐射, 动力学理论, 合成