• Journal of the Chinese Ceramic Society
  • Vol. 52, Issue 12, 3728 (2024)
MI Xiaoyun1,2, LIU Yujie2, WANG Deyan2, DONG Yaling2..., LIU Xiulin1,2 and WANG Yanping1,2|Show fewer author(s)
Author Affiliations
  • 1Research Institute of Changchun University of Science and Technology in Chongqing, Chongqing 401120, China
  • 2School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China
  • show less
    DOI: 10.14062/j.issn.0454-5648.20240318 Cite this Article
    MI Xiaoyun, LIU Yujie, WANG Deyan, DONG Yaling, LIU Xiulin, WANG Yanping. Luminescence Properties and Energy Transfer of Ce3+, Cr3+ Doped Wideband Near-Infrared Luminescent Material Y2CaAl4SiO12[J]. Journal of the Chinese Ceramic Society, 2024, 52(12): 3728 Copy Citation Text show less

    Abstract

    IntroductionNear-infrared (NIR) luminescence with emission wavelengths ranging from 700 nm to 1100 nm has attracted much attention in the fields of nondestructive testing, biometrics, and night vision. In this paper, high-temperature solid-phase method was used to synthesize Cr3+ single-doped and Ce3+, Cr3+ co-doped Y2CaAl4SiO12 luminescent materials. Under 438 nm light excitation, Cr3+ could produce a near-infrared broadband emission at 740 nm and R-line narrowband emission at 690 nm. The quantum efficiency of mono-doped Cr3+ was calculated to be 24%, and the crystal field intensity was calculated to be 2.429 by excitation spectral analysis. The thermal stability and the luminescence intensity of Y2CaAl4SiO12: Cr3+ were analyzed by variable-temperature spectroscopy. In addition, Y2CaAl4SiO12: Ce3+, Cr3+ luminescent materials were also prepared, and the luminescence intensity and the quantum luminescence efficiency of Y2CaAl4SiO12: 0.005Ce3+, 0.007Cr3+ were analyzed.MethodsIn accordance with the stoichiometric ratios, Y2-xCaAl4SiO12: xCe3+ (where x = 0.001-0.011 mol) and Y2CaAl4-ySiO12: 0.005 Ce3+, y Cr3+ (where y = 0.001-0.011 mol) were prepared via solid-state reactions with raw materials of CaCO3, Cr2O3, CeO2, Al2O3, SiO2, and Y2O3. The mixture with anhydrous ethanol was then ground in a mortar. Subsequently, the ground material was dried in an oven at 80 ℃ before being transferred to a square crucible for sintering in a reducing atmosphere at 1550 ℃ for 4 h. Afterwards, the sample was removed and allowed to cool to room temperature for the coming analysis.Results and discussionY2CaAl4SiO12: Cr3+ belongs to a cubic structure, the space group is Math input error, the number of molecules Z=8. The optimal doping concentration of Y2CaAl4-ySiO12: yCr3+(y = 0-0.01) is 0.007, and the quenching mechanism of concentration is dipole-dipole interaction. After co-doping of Cr3+ and Ce3+ (Cr3+ is 0.007), the luminescence intensity is about 3 times greater than that of single-doped Cr3+, and the quantum efficiency is 45%. This indicates that the co-blending improves the luminescence performance of the material. When co-doped with Y2CaAl4SiO12:Ce3+ and Cr3+, the luminescence properties of the sample can reach 77.6% of the room temperature at 423 K (150 ℃), and the thermal stability is good.ConclusionsNear-infrared luminescent materials of Y2-xCaAl4SiO12: Cr3+ and Y2CaAl4SiO12: Ce3+, Cr3+ were synthesized via soild-state reactions. The luminescence properties and thermal stability of the samples were thoroughly analyzed, and Ce3+ was incorporated as a sensitizer to investigate the energy transfer mechanism between Ce3+ and Cr3+ within the matrix. The results indicated that Y2CaAl4SiO12 exhibits a garnet structure, Cr3+ generated a broad near-infrared emission spectrum peaking at 740 nm alongside a sharp peak at 690 nm, achieving a quantum efficiency of 24% when doped alone. Y2CaAl4SiO12: Ce3+, Cr3+ prepared had an energy transfer from Ce3+ to Cr3+. The energy transfer mechanism of this system was elucidated through IS0 and c fitting analyses. The luminous intensity of Y1.995CaAl3.993SiO12: 0.005Ce3+ and 0.007Cr3+ was threefold greater than that of Y2CaAl3.993SiO12: 0.007Cr3+. At this juncture, the quantum efficiency for co-doping reached 45%. When y was 0.011, the energy transfer efficiency measured was 30.01%. The thermal stability of Y2CaAl4SiO12: 0.007Cr3+ revealed that its luminous intensity at 150 ℃ retained 77.6% of its value at room temperature, with a thermal activation energy calculated of 0.207 eV. This work could provide essential data for future applications of this material.
    MI Xiaoyun, LIU Yujie, WANG Deyan, DONG Yaling, LIU Xiulin, WANG Yanping. Luminescence Properties and Energy Transfer of Ce3+, Cr3+ Doped Wideband Near-Infrared Luminescent Material Y2CaAl4SiO12[J]. Journal of the Chinese Ceramic Society, 2024, 52(12): 3728
    Download Citation