The SHGJ Institute Micro-nano Optoelectronics Functional Materials Laboratory has cooperated with Fudan University to make new progress in the study of the Ce3 + ion luminescence red-shift mechanism and fluorescence properties of Cerium-doped Yttrium Aluminum Garnet.
With the continuous development of high-power lighting and display industries, Ce: YAG fluorescent ceramics have become the focus and hotspot of international research due to their high light efficiency and excellent thermodynamic properties. However, because the emission band of Ce3 + excited by blue light in the YAG lattice is near 535nm, the mixed white light has a higher color temperature, and the color rendering performance is difficult to meet the requirements of high-quality lighting. Cerium-doped Yttrium Aluminum Garnet. Ce: YAG fluorescent ceramics have more red light components than pure Ce: YAG fluorescent ceramics, so they can be combined with blue LEDs to mix lower color temperature and higher color rendering index. High quality warm white light. Since the radius of Mg2 + is between Y3 + and Al3 +, it can be replaced at two positions, and the effect of different doping positions on the luminescence performance and red-shift mechanism of Ce: YAG has not been reported so far.
In this study, the researchers designed two sets of experiments for the Y3 + substitution of the dodecahedral center position of Mg2 + in the YAG lattice and the Al3 + substitution of the octahedral center position of the Mg2 + to explore its impact on performance. Through Rietveld refinement and Raman spectroscopy tests, it was found that changes in lattice constants and Raman peaks can be attributed to the difference in bond length and bond strength of Mg-O bonds. However, the different degree of luminescence redshift caused by the doping of Mg2 + in different lattice positions can be explained by the configuration coordinates, and the main reason for its redshift can be attributed to Stokes shift.