Photoluminescence study of rare earth doped Yttrium aluminum garnet—YAG:RE (RE: Eu3+, Pr3+ and Tb3+)

AbstractThe spectra of luminescence and magnetic circular polarization of luminescence of praseodymium–yttrium aluminum garnet Pr^3+ : Y_3Al_5O_12 (PrYAG) are studied in the visible spectral region at temperature T = 300 K. An analysis of spectral dependences of magnetooptical and optical spectra makes it possible to identify optical 4 f –4 f -transitions between Stark sublevels of multiplets ^3 P _0, ^3 P _1, ^3 Н _5, and ^3 Н _6 in PrYAG. It was shown that an important role in the spectrum of the degree of magnetic circular polarization of luminescence of this paramagnetic garnet is played by the effect of quantum-mechanical J – J mixing of states of Stark singlets ^3 Н _5 and ^3 Н _6 of non-Kramer rare-earth ion Pr^3+ in the “green” luminescence band related to forbidden 4 f → 4 f transition ^3 P _0 → ^3 Н _5 in the visible spectral region. To interpret the spectra of magnetic circular polarization of luminescence, the energy of experimentally determined Stark sublevels of multiplets under study, their irreducible representations and wave functions determined by numerical simulation of the energy spectrum of the rare-earth ion Pr^3+ in the garnet structure are used.

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Facet-Related Site Selectivity for Rare-Earth Ions in Yttrium Aluminum Garnet

Physical Review Letters ◽

10.1103/physrevlett.26.1570 ◽

1971 ◽

Vol 26 (25) ◽

pp. 1570-1573 ◽

Cited By ~ 27

Author(s):

R. Wolfe ◽

M. D. Sturge ◽

F. R. Merritt ◽

L. G. Van Uitert

Keyword(s):

Rare Earth ◽

Yttrium Aluminum Garnet ◽

Rare Earth Ions ◽

Site Selectivity ◽

Yttrium Aluminum

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Interface modification for increased fracture toughness in reaction-formed yttrium aluminum garnet/alumina eutectic composites

Journal of Materials Research ◽

10.1557/jmr.1999.0529 ◽

1999 ◽

Vol 14 (10) ◽

pp. 3907-3912 ◽

Cited By ~ 7

Author(s):

Luke N. Brewer ◽

Derrick P. Endler ◽

Shani Austin ◽

Vinayak P. Dravid ◽

Joseph M. Collins

Keyword(s):

Rare Earth ◽

Yttrium Aluminum Garnet ◽

Rare Earth Ions ◽

Alumina Powder ◽

Interface Modification ◽

Interfacial Toughness ◽

Third Phase ◽

Transmission Electron ◽

Yttrium Aluminum ◽

Scanning Transmission

The validity of controlling interfacial toughness in reaction-formed composites was explored using solid-state reaction processing and microanalysis techniques. A variety of rare-earth oxides was added to a yttrium aluminum garnet (YAG)/alumina powder mixture and then melted in air. Some melts retained the crystallography and microstructure of the pure, binary YAG–alumina eutectic. Using scanning transmission electron microscopy in conjunction with energy dispersive X-ray spectroscopy, rare-earth ions were observed both to segregate to the YAG/alumina interface and to form a third phase. Some evidence of increased crack deflection at these interfaces was observed via indentation fracture.

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Electronic Raman Spectroscopy of Rare Earth Doped Yttrium Aluminum Garnet Layers Grown by Liquid Phase Epitaxy

Applied Spectroscopy ◽

10.1366/0003702804731041 ◽

1980 ◽

Vol 34 (6) ◽

pp. 622-624 ◽

Cited By ~ 4

Author(s):

H. van den Boom ◽

R. E. Breemer ◽

J. M. Robertson

Keyword(s):

Liquid Phase ◽

Liquid Phase Epitaxy ◽

Ground State ◽

Yttrium Aluminum Garnet ◽

Yttrium Aluminium Garnet ◽

Raman Transitions ◽

Yttrium Aluminium ◽

Yttrium Aluminum ◽

Crystalline Films ◽

Rare Earth Doped

Thin films of garnet grown by liquid phase epitaxy have been studied by means of the electronic Raman effect. It is shown that films of moderate thickness (about 10 to 20 μm) can be measured directly, without using difficult lightguiding techniques. The method has been applied successfully to the study of electronic Raman transitions of the Tb3+ ion in yttrium aluminium garnet. In this way two transitions were measured in the ground state 7F6 and seven transitions between the ground state 7F6 and the first excited state 7F5. From these results, it is concluded that in crystalline films of yttrium aluminium garnet, terbium substitutes for yttrium in the same way as it does in single crystals.

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Glycothermal synthesis of rare earth iron garnets

Journal of Materials Research ◽

10.1557/jmr.1998.0114 ◽

1998 ◽

Vol 13 (4) ◽

pp. 856-860 ◽

Cited By ~ 15

Author(s):

Masashi Inoue ◽

Toshihiro Nishikawa ◽

Tomoyuki Inui

Keyword(s):

Rare Earth ◽

Yttrium Aluminum Garnet ◽

Hydrothermal Reaction ◽

The Other ◽

Spontaneous Nucleation ◽

Iron Garnets ◽

Yttrium Aluminum ◽

Ionic Size ◽

Two Phases ◽

Iron Garnet

The reactions of rare earth (RE) acetates with iron acetylacetonate in 1,4-butanediol at 300 °C (glycothermal reaction) yielded two novel phases depending on the ionic size of the RE element: one was obtained for Er-Lu and the other for Tb and Dy. The former phase was hexagonal REFeO3, while the latter phase has not been identified. The reaction of Y or Ho acetate yielded the mixture of these two phases. When the reactions were carried out in the presence of seed crystals of yttrium aluminum garnet (Y3Al5O12), these phases were not formed but RE iron garnet (RE3Fe5O12) grew on the seed, which suggests that spontaneous nucleation of RE iron garnet does not occur, but crystal growth proceeds easily under the glycothermal conditions. Hydrothermal reaction of the same starting materials yielded a mixture of Fe2O3 and an amorphous RE phase.

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