Preparation And Spectral Detection Performance Of Cation-Modulated Apatite Structured Color-Tunable Luminescent Materials

Luminous materials are widely used in the fields of display,illumination and anti-counterfeiting,and people have put forward higher requirements for the performance of luminous materials.In recent years luminescent materials based on cationic modulation through spectral clipping research,to solve the problems of color reabsorption,color ratios difficult to regulate,to achieve multifunctional applications of luminescent materials under the same substrate conditions.In this paper,LiGd₉（SiO₄）₆O₂ is used as a substrate by high-temperature solid-phase method,and the crystal structure,microscopic morphology,luminescence mechanism,energy transfer,and color modulation are systematically investigated by cation modulation of crystal lattice,as follows:（1）LiGd₉（SiO₄）₆O₂ substrates were successfully prepared by high-temperature solid-phase method,and three luminescent materials,LiGd₉（SiO₄）₆O₂:0.1Dy³⁺,LiGd₉（SiO₄）₆O₂:0.8Eu³⁺and LiGd₉（SiO₄）₆O₂:0.8Sm³⁺,were prepared by rare-earth ion substitution.Systematically probing LiGd₉（SiO₄）₆O₂:x Dy³⁺luminescent materials,the Dy³⁺ion emission band peaks are located at 480 nm,577 nm and 662 nm,corresponding to the Dy³⁺ion ⁴F_9/2-⁶H_15/2,⁶H_13/2,⁶H_11/2 electron transitions,respectively.The color coordinate shifts from（0.442,0.418）to（0.429,0.433）.LiGd_9-x（SiO₄）₆O₂:0.15Dy³⁺luminescent material has the maximum emission intensity and has potential applications in the field of yellow light display.Systematically explored LiGd_9-y（SiO₄）₆O₂:y Bi³⁺luminescent material,the peak emission spectrum at 340 nm excitation is located at 462 nm,attributed to the ³P₁→¹S₀ electron leap of Bi³⁺.the CIE color coordinate shifts from（0.213,0.2518）to（0.385,0.4278）.the LiGd₉（SiO₄）₆O₂:0.04Bi³⁺luminescent material has the largest emission intensity and has potential application in the field of blue light display.（2）LiGd₉（SiO₄）₆O₂:0.04Bi³⁺x Dy³⁺（x=0.1,0.15,0.2,0.3）luminescent materials were synthesized by high-temperature solid-phase method with multiple excitation bands and two emission bands with peaks at 487 nm and 576 nm,respectively.The CIE coordinate at（0.3345,0.3658）reaches a white region with potential applications in UV excited white LEDs.（3）Two sets of luminescent materials,（Li/Na/K）Gd_8.81（SiO₄）₆O₂:0.04Bi³⁺0.15Dy³⁺and Li（Gd/La/Lu）_8.81（SiO₄）₆O₂:0.04Bi³⁺0.15Dy³⁺,were synthesized by high-temperature solid phase method.The effects on the substrate structure and luminescence properties through the modulation of monovalent alkali metal ions and trivalent rare earth ions were investigated.The CIE coordinates emitted different colors of light under excitation at two wavelengths of 254 nm and 365 nm.The synthesized luminescent materials have the characteristics of color tunable emission,（Li/Na/K）Gd_8.81（SiO₄）₆O₂:0.04Bi³⁺0.15Dy³⁺and Li（Gd/La/Lu）_8.81（SiO₄）₆O₂:0.04Bi³⁺0.15Dy³⁺two groups of luminescent materials have potential applications in the field of anti-counterfeiting.