Yanzhi Zhang,Xiaoxu Deng,Ruirui Cui,Xiang Guo,Jun Zhang,Chaoyong Deng
In order to obtain efficient single-phase co-doped phosphors with excellent luminescence properties under near-ultraviolet excitation, Ca 3 Gd 2 Si 3 O 12 : x Dy 3+ (CGSO: x Dy 3+ ) and Ca 3 Gd 2 Si 3 O 12 :0.08Dy 3+ , y Sm 3+ (CGSO:0.08Dy 3+ , y Sm 3+ ) phosphors were effectively manufactured using the classical high-temperature solid-phase method. The phase structure, morphology and XPS test results of the phosphor all show that the Ca 3 Gd 2 Si 3 O 12 (CGSO) material has been successfully synthesized, and Dy 3+ and Sm 3+ ions have been successfully doped into the matrix lattice. Under 362 nm illumination, the PL spectra of CGSO:0.08Dy 3+ , y Sm 3+ phosphor revealed that the typical peak intensity of Dy 3+ ions declined as the amount of Sm 3+ ions increased, whereas the distinctive peak intensity of Sm 3+ ions achieved its maximum at y = 0.07. As Sm 3+ doping grows larger, the fluorescence lifetime shortens, signifying the occurrence of transferring energy among Dy 3+ and Sm 3+ ions, with a maximum efficiency of 81 % being attained. The Ca 3 Gd 2 Si 3 O 12 :0.08Dy 3+ , y Sm 3+ phosphor demonstrates a commendable thermal stability of 90.17 %, with adjustments to the Sm 3+ concentration revealing the potential to yield warm white light, as evidenced by both CIE chromaticity coordinates and CCT measurements. In addition, compared with the phosphor containing only Dy 3+ , the LED assembled with CGSO:0.08Dy 3+ , y Sm 3+ phosphor containing Sm 3+ ions and 365 nm LED chip emits warmer white light with lower color temperature, which confirms the application value of CGSO:0.08Dy 3+ , y Sm 3+ phosphor in the domain of solid-state lighting.
The demand for efficient plant lighting has driven the search for high-performance blue-emitting phosphors, as blue light (400–500 nm) is crucial for photosynthesis, protein synthesis, and biomass accumulation. However, existing phosphors often lack optimal spectral coverage and thermal stability. This study presents a novel garnet-type blue phosphor, Ca 3 Gd 2 Si 3 O 12 :Ce 3+ , synthesized via solid-state reaction. Under 356 nm excitation, it emits intense blue light (peak at 411 nm) with a broad FWHM of 80.91 nm, outperforming commercial phosphors like BaMgAl 10 O 17 :Eu 2+ . Its emission closely matches chlorophyll absorption, achieving overlap efficiencies of 84.14 % (chlorophyll a ) and 94.81 % (chlorophyll b ). The phosphor also exhibits excellent thermal stability (activation energy: 0.296 eV; T 50 = 387 K). Additionally, when integrated into WLEDs with red/green phosphors, Ca 3 Gd 2 Si 3 O 12 :Ce 3+ delivers warm white light (CCT = 4512 K, CRI = 92.3), demonstrating versatility in both plant growth and high-quality lighting applications. LEDs with this study's blue phosphor have higher CRI than ordinary lighting LEDs (reducing blue light harm) and a broad spectrum, better suiting plant growth compared to traditional blue plant LEDs.
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