白光LED因具有发光效率高、寿命长、能耗低、绿色环保等诸多优点，被广泛应用于照明和显示领域。目前，通过荧光粉转换实现白光LED的主要方式是蓝光芯片激发黄光荧光粉或紫外芯片激发红绿蓝三基色混合荧光粉，却各有不足之处。紫外光激发的单基质白光荧光粉不仅可以避免前者显色指数低、色温高等缺点，同时能解决后者辐射重吸收、发光效率低等问题。因此，开发紫外光激发的单基质白光荧光粉已成为研究热点。本项目以具有自激活发光中心的d0过渡金属(TM)化合物作为基质，Tb3+和Sm3+作为激活离子，构建Tb3+-O2--TMn+价间电荷迁移(IVCT)带和Tb3+/Sm3+在相应基质中的能级结构，利用IVCT带→Tb3+→Sm3+或基质→Tb3+→Sm3+能量传递在单基质中实现白光发射，研发适用于白光LED的单基质白光荧光粉。本项目将为开发设计高性能的单基质白光荧光粉提供重要的理论依据和技术指导。

White light-emitting diodes (WLEDs) have extensive applications in lighting and display fields owing to their excellent performances, such as high luminescence efficiency, long lifetime, energy saving and environmental friendliness. Currently, most of phosphor-converted WLEDs are fabricated by the combination of blue InGaN LED chip with yellow phosphor Y3Al5O12:Ce3+ or by the coupling of a ultraviolet LED chip with tri-color (red, green and blue) phosphors. However, both methods have their own disadvantages, such as low color-rendering index and high color temperature associated with the former approach, and color reabsorption and low luminous efficiency for the later way, respectively. Single-phase white emitting phosphors excited by ultraviolet light have the promising potential to overcome the issues mentioned above and have attracted significant attention due to their good luminescence efficiency, color reproducibility as well as low manufacturing costs. Thus, it is urgent to develop high efficient single-phase white emitting phosphors. Herein, this project intends to be carried out by use of d0 transition metal (TM) compounds with self-activating luminescent center as host materials and Tb3+/Sm3+ as active ions, estimate the locations of Tb3+-O2--TMn+ intervalence charge transfer (IVCT) band and Tb3+/Sm3+ energy levels in the corresponding host, through IVCT band→Tb3+→Sm3+ or host→Tb3+→Sm3+ energy transfer to achieve the white emission in the single-phase phosphors, and finally explore their applications in WLEDs. The research results will provide important theoretical basis and technical guidance for the development and design of high efficient single-phase white emitting phosphors.