Morphology and Microstructure of Crystalline Yag-Al2o3 Composites Grown by the Horizontal Directional Crystallization

Vovk, O.M.; Siryk, Yuriy; Nizhankovskyi, S.V.; Fedorov, A.A.; Mateichenko, Pavel

doi:10.2139/ssrn.4176035

Cited by 1 publication

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“…The tablets were annealed at 1200 °C for several hours and the annealed tablets served as a “green body” for crystallization. Crystallization was performed by the HDC method on standard installations for Mo crucibles with a size of 240 × 75 × 35 mm 3 , according to the modes for the YAG crystals’ growing method [ 22 ]. During crystallization, different parts of the crystal were grown with different crystallization rates ( Figure 1 and Table 1 ).…”

Section: Sample Preparation and Experimental Techniquesmentioning

confidence: 99%

“…In this work, we have investigated the properties of highly doped Ce 3+ doped Al 2 O 3 -YAG eutectic samples, which were crystalized by the horizontal directional crystallization (HDC) method [ 22 ] with different crystallization rates. Namely, the current work presents the new systematic results of studying the morphology, structural, and luminescent properties of these materials.…”

Section: Introductionmentioning

confidence: 99%

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Ce3+ Doped Al2O3-YAG Eutectic as an Efficient Light Converter for White LEDs

et al. 2023

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Ce3+ doped Al2O3-YAG eutectics were successfully grown by the horizontal directional crystallization method. The crystallization rate of eutectic growth was changed in the 1–7.5 mm/h range at a growth temperature of 1835 ℃. The microstructure of eutectic samples was investigated using scanning electron microscopy and X-ray microtomography. The intrinsic morphology of eutectic represents the stripe-like channel structure with a random distribution of the garnet Y3Al5O12 (YAG) and Al2O3 (sapphire) phases. The content of these phases in the stripes changes in the 52.9–55.3% and 46.1–47.1% ratios, respectively, depending on the growth rate of the crystallization of the eutectic samples. The luminescent properties of the eutectic demonstrated the dominant Ce3+ luminescence in the garnet phase. The luminescence of the Ce3+ ions in Al2O3 has also been observed and the effective energy transfer processes between Ce3+ ions in the Al2O3 and YAG garnet phases were revealed under high-energy excitation and excitation in the UV Ce3+ absorption bands of sapphire. The phosphor conversion properties and the color characteristics (Al2O3-YAG):Ce eutectic with different thicknesses were investigated under excitation by a blue LED. We have also tested the prototypes of white LEDs, prepared using a blue 450 nm LED chip and (Al2O3-YAG):Ce eutectic photoconverters with 0.15 to 1 mm thicknesses. The results of the tests are promising and can be used for the creation of photoconverters for high-power white LEDs.

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Section: Sample Preparation and Experimental Techniquesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%