[China Aluminum Industry] transparent crystalline yttrium aluminum garnet (YAG; Y3Al5O12) has received extensive attention due to its importance as a solid-state laser phosphor host material. Commercial YAG materials are typically single crystals that grow by directional solidification from the melt and exhibit excellent optical properties. However, such single crystals are limited in size and shape, large chemical doping levels and crystal growth rates, which means high production costs. Recently, transparent YAG ceramics have proven their important applications in fields including optics, electronics and scintillators.

[Introduction]

Recently, Li Jianqiang of the Institute of Process Engineering of the Chinese Academy of Sciences and Mathieu Allix (Common Communication) of the University of Orleans of France have simply produced transparent YAG-based ceramics through pressureless nanocrystallization of Y2O3-Al2O3 bulk glass. The resulting ceramic exhibits a nanostructure composed of YAG nanocrystals (77 wt%) separated by a small Al2O3 crystalline domain (23 wt%). The hardness of these YAG-Al2O3 nanoceramics is 10% higher than that of YAG single crystals. When doped with Ce3+, the YAG-Al2O3 ceramic has a quantum efficiency of 87.5%. The combination of these mechanical and optical properties, as well as its simple, economical and innovative methods of preparation, can advance the development of technology-related materials and have potential applications in a wide range of optical fields such as lenses, gems, phosphor converters and laser diodes, etc. . Related results were published on Nat. Commun. entitled "Pressureless glass crystallization of transparent yttrium aluminum garnet-based nanoceramics".

Figure 1 Transparent YAG-Al2O3 Composite Nanoceramic

a) Brightfield TEM micrographs

b) X-ray diffraction of YAG-Al2O3 ceramics crystallized from 26 Y2O3-74Al2O3 glass

c) HRTEM micrographs of YAG-Al2O3 ceramics

d) Transmission spectra of UV-VIS-NIR and MIR regions of YAG-Al2O3 ceramics

Fig. 2 TEM study of YAG-Al2O3 ceramic nanostructures

a) STEM-HAADF images of YAG-Al2O3 ceramics

b) HRTEM micrographs of the same YAG-Al2O3 ceramics

c, d) STEM-EDX cation (c) compositional profile and (d) elemental map

Fig. 3 Mechanical and optical properties of YAG-Al2O3 nanoceramics

a) Typical load-displacement curves for AY26 ceramics

b) Photoluminescence excitation and emission spectra

c) Color coordinates of YAG-Al2O3 ceramics

d) WLEDs based on YAG-Al2O3 ceramics

summary

This work synthesizes a fully dense YAG-Al2O3 composite nanoceramics with 74mol% Al2O3-26 mol% Y2O3 glass through pressureless and complete crystallization. The combination of these mechanical and optical properties, as well as its simple, economical and innovative methods of preparation, can advance the development of technology-related materials and have a wide range of applications in the field of optics.

Links: Pressureless glass crystallization of transparent yttrium aluminum garnet-based nanoceramics

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