Visible to near infrared conversion in Ce{sup 3+}-Yb{sup 3+} Co-doped YAG ceramics
- Graduate School of Human and Environmental Studies, Kyoto University, Yoshida-nihonmatsu-cho Sakyo-ku, Kyoto 606-8501 (Japan)
In Ce{sup 3+}-Yb{sup 3+} co-doped Y{sub 3}Al{sub 5}O{sub 12} (YAG) ceramics, possibility of quantum cutting mechanism converting one visible photon into two NIR photons with optimum quantum efficiency approaching 200% have been investigated. In this material, Yb{sup 3+} emissions due to the {sup 2}F{sub 5/2}-{sup 2}F{sub 7/2} in the range of 1 mum were observed upon the excitation of 5d level of Ce{sup 3+}. In addition, excitation spectra of Yb{sup 3+} emission corresponded to that of Ce{sup 3+} emission completely. Lifetime of the 5d level of Ce{sup 3+} decreased with increasing Yb{sup 3+} content. These results indicate the energy transfer (ET) from the 5d levels of Ce{sup 3+} to the {sup 5}F{sub 5/2} level of Yb{sup 3+}. In (Y{sub 0.945}Ce{sub 0.005}Yb{sub 0.05}) {sub 3}Al{sub 5}O{sub 12} sample, the directly measured quantum yield (QY) of Yb{sup 3+} emission upon the excitation of 5d level of Ce{sup 3+} was about 12% and lower than QY (96%) that estimated from the ET efficiency which was calculated with the measured lifetime of Ce{sup 3+}.
- OSTI ID:
- 21361771
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 4 Vol. 106; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALUMINATES
ALUMINIUM COMPOUNDS
BOSONS
CERAMICS
CERIUM IONS
CHARGED PARTICLES
DOPED MATERIALS
EFFICIENCY
ELEMENTARY PARTICLES
EMISSION
ENERGY TRANSFER
IONS
LASERS
LIFETIME
LUMINESCENCE
MASSLESS PARTICLES
MATERIALS
NEODYMIUM LASERS
OXYGEN COMPOUNDS
PHOTOLUMINESCENCE
PHOTON EMISSION
PHOTONS
QUANTUM EFFICIENCY
SOLID STATE LASERS
TRANSITION ELEMENT COMPOUNDS
YTTERBIUM IONS
YTTRIUM COMPOUNDS