Optical spectra of undoped and rare-earth-(=Pr, Nd, Eu, and Er) doped transparent ceramic Y sub 3 Al sub 5 O sub 12

Journal Article · Fri Mar 15 04:00:00 EST 1991 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.348959· OSTI ID:5637531

Sekita, M; Haneda, H; Shirasaki, S ^[1]; Yanagitani, T ^[2]

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1. National Institute for Research in Inorganic Materials, Namiki, Tsukuba-shi, Ibaraki 305, Japan (JP)
2. Takuma Works, Konoshima Chemical Co. Ltd., Kouda, Takuma-chou, Mitoyo-gun, Kagawa (Japan)

Undoped and rare-earth- (Pr, Nd, Eu, and Er) doped transparent Y{sub 3}Al{sub 5}O{sub 12} ceramics have been prepared, and their optical spectra have been measured. It is found that absorption coefficient of the undoped ceramic Y{sub 3}Al{sub 5}O{sub 12} is almost independent of wavelength with 0.258 cm{sup {minus}1}, which gives transmittance of the undoped ceramic Y{sub 3}Al{sub 5}O{sub 12} to be, for example, 95% for a 2-mm height. Peaks in the absorption and emission spectra of Pr:Y{sub 3}Al{sub 5}O{sub 12} are assigned to the transitions in 4{ital f}{sup 2} configuration. The transitions from the multiplets with total angular momentum {ital J}=0 to multiplets with even {ital J} momentum are strong as predicted by Judd--Ofelt theory. The overall and detail structure of the absorption and emission spectra of Nd:Y{sub 3}Al{sub 5}O{sub 12} is the same as those in a previous publication. However, the absorption coefficient at nonabsorbing wavelengths by Nd{sup 3+} is reduced from more than 1.7 to 0.25 cm{sup {minus}1}. A simple estimation of the population inversion threshold of the Nd:Y{sub 3}Al{sub 5}O{sub 12} ceramic reveals that the threshold is still about 25 times larger than that of single-crystal Nd:Y{sub 3}Al{sub 5}O{sub 12}. Peaks in the absorption and emission spectra of Er:Y{sub 3}Al{sub 5}O{sub 12} ceramic are assigned to the transitions in 4{ital f}{sup 11} configuration. The transition energies agree well with those reported for single-crystal Er:Y{sub 3}Al{sub 5}O{sub 12} and the other hosts within 30 cm{sup {minus}1}. A Stark splitting scheme for some multiplets has been constructed. Peaks in the emission, absorption, and excitation spectra of Eu:Y{sub 3}Al{sub 5}O{sub 12} ceramic are assigned to the transitions in 4{ital f}{sup 6} configuration.

• OSTI ID: 5637531
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 69:6; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ABSORPTION SPECTRA
ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CERAMICS
CHALCOGENIDES
DOPED MATERIALS
EMISSION SPECTRA
ENERGY-LEVEL TRANSITIONS
MATERIALS
OXIDES
OXYGEN COMPOUNDS
RARE EARTH ADDITIONS
RARE EARTH ALLOYS
SPECTRA
STARK EFFECT
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES