Design of Phosphor Materials for White Light Source by Control of 4f Electronic Transition Probability of Rare Earth in Solids

随着蓝色发光二极管（LED）的发展、增强和成本的降低，利用蓝色LED的白色LED的研发越来越活跃，促进了对替代荧光灯管的高效白色光源的期望。我们开始研究开发可由蓝光LED和蓝紫激光二极管（LD）激发的新型磷光体材料以及波长设计，材料制造和精确评估其光学性能。作为目标的材料如下：（I）Ce^<3+>离子在单晶和固溶体石榴石晶体中的宽可见荧光，它们的波长变化、量子产率、与蓝光LED结合的发射光谱的色坐标，（II）显示高激发效率和高透明度的YAG玻璃陶瓷材料，（III）本论文主要研究了Sm^<3+>掺杂的405 nm强激发荧光粉， ...更多信息 采用蓝紫半导体激光器和研制的玻璃荧光粉制作了一个量子点器件，研究了组成与配位场参数、光谱、跃迁几率、量子效率和用积分球测量的量子产率之间的关系。这是可能的应用Judd-Ofelt分析透明玻璃样品和计算Judd-Ofelt参数估计量子效率结合寿命数据。我们成功地将半理论值和直接从总通量测量获得的实验值进行了系统的比较。对于YAG基玻璃陶瓷，我们确认了与商业白色LED相当的发光效率，并提出了专利。综上所述，我们进行了系统的研究，稀土掺杂磷光体材料，包括开发新材料和评估基于4f电子的光学性质和作为固态照明器件的器件性能，无论是实验上还是理论上。少

With the development, empowering and cost reduction of blue light-emitting diodes (LED), R＆D of white LED utilizing blue LED have become more and more active, promoting an expectation of highly efficient white light sources that would replace the fluorescent tubes.In this project, based on the above background, we started the research on development of novel phosphor materials that can be excited by blue LEDs and blue-violet laser diode (LD) and on the wavelength design, material fabrication and precise evaluation of their optical properties. Materials as targets are as follows; (I) broad visible fluorescence of Ce^<3+> ions in single crystalline and solid solution garnet crystals, their wavelength variation, quantum yields, color coordinates of emission spectra combined with blue LED, (II) YAG glass ceramic materials which show high excitation efficiency and high transparency, (III) We originally focus on Sm^<3+> doped phosphors with strong excitation band at 405nm, for power-illumina … More tion device with blue-violet LD and developed glass phosphors, investigated the relationship between composition and ligand-field parameters, spectra, transition probability, quantum efficiency and the quantum yields measured with an integrating sphere. It is possible to apply the Judd-Ofelt analyses for transparent glass samples and to calculate the Judd-Ofelt parameters for estimating the quantum efficiency combined with the lifetime data. We have successfully compared the systematic data of semi-theoretical value and experimental values obtained directly from the total flux measurement.For the YAG-based glass ceramics, we confirmed the luminous efficacy comparable to that of commercial white LEDs and proposed a patent.In summary, we conducted systematic studies on rare-earth doped phosphor materials including development of novel materials and evaluation of optical properties based on 4f electrons and of device performances as a solid-state lighting device, both experimentally and theoretically. Less