Ce: YAG- AlO composite ceramics are regarded as highly promising materials for laser illumination application due to their high luminous efficacy and thermal stability. Nevertheless, the Ce: YAG ceramics exhibit limited color rendering index (CRI) for indoor lighting due to their low red emission component. In this study, we synthesized high-performance Ce, Mn-doped (Y, Tb)AlO–AlO composite ceramic phosphors via a vacuum solid-state sintering method. It was observed that the introduction of Mn ions created a second luminescence center with an emission peak centered at 580 nm. As the Mn concentration increased, the emission peak redshifted from 580 nm to 591 nm, leading to a significant enhancement in the color rendering index of the ceramics. The cross-energy transfer between Tb and Mn, Ce ions augmented the absorption and conversion of blue light by the ceramics, thereby reducing the correlated color temperature greatly. Based on these findings, ceramics with a Ce concentration of 3 at% and a Mn concentration of 4 at% exhibited the highest CRI values (81.3 and 75.6) under both laser excitation and LED excitation, establishing them as strong candidates for achieving high color rendering in white LED/LD illumination applications.

中文翻译：

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用于高显色性白光 LED/LD 照明的 Al2O3–Ce:(Y, Tb)3 (Al, Mn)5O12 复合陶瓷荧光粉的制备

Ce:YAG-Al2O复合陶瓷由于其高发光效率和热稳定性而被认为是非常有前途的激光照明材料。然而，由于其红色发射成分较低，Ce:YAG 陶瓷在室内照明中的显色指数 (CRI) 有限。本研究采用真空固相烧结法合成了高性能Ce、Mn掺杂(Y,Tb)Al2O3-Al2O3复合陶瓷荧光粉。据观察，Mn 离子的引入产生了第二个发光中心，其发射峰集中在 580 nm。随着Mn浓度的增加，发射峰从580 nm红移到591 nm，导致陶瓷的显色指数显着提高。 Tb与Mn、Ce离子之间的交叉能量转移增强了陶瓷对蓝光的吸收和转换，从而大大降低了相关色温。基于这些发现，Ce 浓度为 3 at% 和 Mn 浓度为 4 at% 的陶瓷在激光激发和 LED 激发下均表现出最高的 CRI 值（81.3 和 75.6），使它们成为实现高显色性的有力候选者。在白光 LED/LD 照明应用中。