Application Study of High Thermal Stability Phosphors Based on Negative Thermal Expansion Material Sc 2 Mo 3 O 12 : Tm 3 + , Dy 3 + in White LEDs

The negative thermal expansion characteristic of Sc 2 Mo 3 O 12 resulting from the rotation of MoO 4 tetrahedra causes lattice contraction and structural stabilization at high temperatures, significantly enhancing thermal shock resistance and thermal cycling life. This phosphor with excellent thermal stability based on negative thermal expansion materials holds significant application potential in LED applications across precision instruments, microelectronic packaging, and aerospace sectors. This paper successfully synthesized a series of phosphors co‐doped with Tm 3 + /Dy 3 + ions using a Sc 2 Mo 3 O 12 matrix. White light emission with tunable color coordinates was achieved by adjusting the Dy/Tm ion concentration under excitation at 354 nm. Systematic investigations were conducted on the crystal structure, microstructure, and optical properties of the material. Under 354 nm excitation, the prepared phosphors exhibit excellent luminescence stability across a broad temperature range from 298 to 573 K. Specifically, at 573 K, their luminescence intensity retains 60% of the initial intensity measured at room temperature (298 K). This demonstrates the realization of phosphors with tunable color coordinates and superior thermal stability.