Express Synthesis of YAG:Ce Ceramics in the High-Energy Electrons Flow Field

Лисицын, В. М.; Тулегенова, А. Т.; Канева, Е. В.; Mussakhanov, Dosimkhan; Гриценко, Б. П.

doi:10.3390/ma16031057

Cited by 8 publications

(5 citation statements)

References 25 publications

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“…This conclusion is consistent for both nanopowder-based synthesis and the synthesis from larger grain sizes. It is likely that in the region with the highest absorbed energy density [14][15][16][17][18][19][20][21], the rate of new YAG phase formation is so rapid that charged particles do not have the opportunity to leave the reactor zone before the decomposition of the initial particles occurs.…”

Section: Discussionmentioning

confidence: 99%

“…Recent studies have shown that YAG:Ce ceramics can be synthesized from refractory metal oxides using a powerful electron beam without the need for additional substances to facilitate the synthesis [15,16]. These studies have demonstrated the possibility of synthesizing ceramics in times shorter than 1 s, making it a highly attractive method for synthesizing YAG:Ce phosphors.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Precursor Prehistory on the Efficiency of Radiation-Assisted Synthesis and Luminescence of YAG:Ce Ceramics

et al. 2023

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The quality of synthesized materials is affected by various factors such as the prehistory of substances used and the synthesis technology. Most methods for synthesizing luminescent ceramics based on metal oxides rely on high-temperature heating to facilitate the necessary exchange of elements between precursor particles. However, a promising alternative method involves the direct application of a powerful high-energy radiation flux, which stimulates different processes. The formation of ceramics through this method occurs in a highly ionized medium, which may produce different results from those achieved through thermal exposure. This paper reports the findings of a study that explores the relationship between the morphology and luminescent properties of YAG:Ce ceramics and the characteristics of Y2O3 and Al2O3 oxides used in the synthesis, such as dispersity and activator concentration. The results indicate that the morphology of the synthesized ceramic samples is significantly affected by the dispersity of the powder mixture used.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Precursor Prehistory on the Efficiency of Radiation-Assisted Synthesis and Luminescence of YAG:Ce Ceramics

et al. 2023

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“…In 1995, Shuji Nakamura of Nichia Chemical Industries invented the phosphorconverted white LED system, which first introduced yellow emitting yttrium aluminum garnet (YAG: Ce 3+ ) phosphor coated on a blue LED to the market [6][7][8]. However, the white light obtained using this method lacks red components, limiting its application in high-end indoor lighting [9,10].…”

Section: Introductionmentioning

confidence: 99%

Spinel-Based ZnAl2O4: 0.5%Cr3+ Red Phosphor Ceramics for WLED

Ji,

Xu,

Qiang

et al. 2024

Materials

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To address the issue of the lack of red light in traditional Ce3+: YAG-encapsulated blue LED white light systems, we utilized spark plasma sintering (SPS) to prepare spinel-based Cr3+-doped red phosphor ceramics. Through phase and spectral analysis, the SPS-sintered ZnAl2O4: 0.5%Cr3+ phosphor ceramic exhibits good density, and Cr3+ is incorporated into [AlO6] octahedra as a red emitting center. We analyzed the reasons behind the narrow-band emission and millisecond-level lifetime of ZAO: 0.5%Cr3+, attributing it to the four-quadrupole interaction mechanism as determined through concentration quenching modeling. Additionally, we evaluated the thermal conductivity and thermal quenching performance of the ceramic. The weak electron-phonon coupling (EPC) effects and emission from antisite defects at 699 nm provide positive assistance in thermal quenching. At a high temperature of 150 °C, the thermal conductivity reaches up to 14 W·m−1·K−1, and the 687 nm PL intensity is maintained at around 70% of room temperature. Furthermore, the internal quantum efficiency (IQE) of ZAO: 0.5%Cr3+ phosphor ceramic can reach 78%. When encapsulated with Ce3+: YAG for a 450 nm blue LED, it compensates for the lack of red light, adjusts the color temperature, and improves the color rendering index (R9). This provides valuable insights for the study of white light emitting diodes (WLEDs).

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“…For the first time, we proposed and implemented the synthesis method of YAG ceramics with activators from a mixture of Y 2 O 3 and Al 2 O 3 powders in the field of a powerful flux of high-energy electrons [18,19]. The method seems promising: the synthesis is realized in 1s, without the use of any substances facilitating the synthesis, with high productivity without the use of additional energy sources.…”

Section: Introductionmentioning

confidence: 99%

The Optimization of Radiation Synthesis Modes for YAG:Ce Ceramics

et al. 2023

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Synthesis in the radiation field is a promising direction for the development of materials transformation processes, especially those differing in melting temperature. It has been established that the synthesis of yttrium–aluminum ceramics from yttrium oxides and aluminum metals in the region of a powerful high-energy electron flux is realized in 1 s, without any manifestations that facilitate synthesis, with high productivity. It is assumed that the high rate and efficiency of synthesis are due to processes that are realized with the formation of radicals, short-lived defects formed during the decay of electronic excitations. This article presents descriptions of the energy-transferring processes of an electron stream with energies of 1.4, 2.0, and 2.5 MeV to the initial radiation (mixture) for the production of YAG:Ce ceramics. YAG:Ce (Y3Al5O12:Ce) ceramics samples in the field of electron flux of different energies and power densities were synthesized. The results of a study of the dependence of the morphology, crystal structure, and luminescence properties of the resulting ceramics on the synthesis modes, electron energy, and electron flux power are presented.

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Express Synthesis of YAG:Ce Ceramics in the High-Energy Electrons Flow Field

Cited by 8 publications

References 25 publications

Effect of Precursor Prehistory on the Efficiency of Radiation-Assisted Synthesis and Luminescence of YAG:Ce Ceramics

Effect of Precursor Prehistory on the Efficiency of Radiation-Assisted Synthesis and Luminescence of YAG:Ce Ceramics

Spinel-Based ZnAl2O4: 0.5%Cr3+ Red Phosphor Ceramics for WLED

The Optimization of Radiation Synthesis Modes for YAG:Ce Ceramics

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