The red phosphor NaGdMgTeO₆∶xEu³⁺ （x = 0.1-1.0） was successfully prepared using the high-temperature solid-phase method. Comprehensive characterization of its structural， and photoluminescence properties was conducted using X-ray diffraction （XRD）， scanning electron microscopy （SEM）， diffuse reflectance spectroscopy （DR）， photoluminescence spectroscopy （PL）， and electroluminescence （EL） measurements. Under 397 nm UV excitation， NaGdMgTeO₆∶Eu³⁺ exhibits characteristic emission of Eu³⁺. The optimal doping concentration of Eu³⁺ was found to be x = 0.5， beyond which higher concentrations result in concentration quenching. Temperature-dependent PL spectra were analyzed to investigate the thermal stability and potential application of NaGdMgTeO₆∶0.5Eu³⁺ as a temperature sensor. Key parameters related to its temperature sensing performance were calculated. Additionally， the photoelectrical properties of LED devices fabricated with this phosphor were evaluated， demonstrating its promising application in solid-state lighting. Furthermore， the material showed potential for latent fingerprint detection， indicating its multifunctional nature. In summary， NaGdMgTeO₆∶Eu³⁺ emerges as a versatile material with potential applications across various fields.

NaGdMgTeO₆;luminescence;LED;temperature sensing;latent fingerprint