Ce: YAG as a luminescent phosphor excited by a blue LED and LD chip, was broadly applied in the LED and LD lighting and display, on account of its high luminous efficiency, high lumens, and high thermal conductivity. Recently, the Mg²⁺-Si⁴⁺ co-doped in Ce: YAG (Ce: YMASG) ceramic phosphors have been broadly investigated. As a result, the emission wavelength of Ce³⁺ can be easily tunned from 530 nm to 610 nm with the increase of Mg²⁺-Si⁴⁺ content.

Lately, a research team from Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, optimizes the Ce: YMASG ceramic phosphors through the regulation of concentration of Ce³⁺ and the impurity phase Y₄MgSi₃O₁₃. In addition, the result was published in the Journal of the America Ceramic Society.

In the process of the research, they fabricated the xCe: YMASG (x= 1%, 2%, 3%, and 6% mol) and yAl₂O₃-Ce: YMASG (y= 3wt%, 5wt%, 10wt%) ceramic phosphors through the vaccum sintering technology with the sintering temperature at about 1500 ℃ for 5 h.

They found in the xCe: YMASG, the high luminous efficiency with 38.8 lm/W was obtained, when x= 3% mol. In the yAl₂O₃-Ce: YMASG, the impurity phase disappeared, when y=10 wt%. Compared to the Ce: YMASG, the thermal stability of luminescence has been improved of 10 wt% Al₂O₃-Ce: YMASG ceramic phosphors and its luminous efficiency increased to 58.6 lm/W.

This work was supported by the Innovation Program of Science and Technology Commission of Shanghai Municipality and the International Partnership Program of Chinese Academy of Sciences.

Fig. 1(a) XRD patterns and magnified XRD patterns for the (420) plane of xCe: YMASG with x = 1, 2, 3, and 6 % mol. (b) XRD patterns of yAl2O3-0.01Ce:Y2.99Mg1.8Al1.4Si1.8O12 ceramic phosphors with y = 0, 3, 5, and 10 wt%. (c) Photos of the samples. (Image by SIOM)

Article website:
https://doi.org/10.1111/jace.17388

Contact:
Mr. Wu Xiufeng
General Administrative Office
Shanghai Institute of Optics and Fine Mechanics, CAS
Email: xfwu@siom.ac.cn