J Appl Phys. 2011 Sep 01;110(5):53102-531026. doi: 10.1063/1.3632069. Epub 2011 Sep 07.

Analysis of Ce luminescence quenching in solid solutions between Y(3)Al(5)O(12) and Y(3)Ga(5)O(12) by temperature dependence of photoconductivity measurement.

Journal of applied physics

Jumpei Ueda, Setsuhisa Tanabe, Takayuki Nakanishi

PMID: 21990945 PMCID: PMC3189254 DOI: 10.1063/1.3632069

Abstract

Photocurrent excitation spectra were measured to investigate the quenching in the garnet solid solutions. Intense photocurrent excitation bands attributed to the lowest 5d(1) and the second lowest 5d(2) levels were observed in the Ce-doped Y(3)Al(2)Ga(3)O(12) (Ce:YAGG) and Y(3)Ga(5)O(12) (Ce:YGG). Based on the results of temperature dependence of photoconductivity, the 5d(1) and 5d(2) levels in the Ce:YAGG are found to be located below and within the conduction band, respectively, while both levels in the Ce:YGG are found to be located within its conduction band located at lower energy levels. In addition, the threshold of photoionization from the 4f level of Ce(3+) to the conduction band in the Ce:YAGG and Ce:YGG were estimated to be 3.2, and 2.8 eV, respectively. We conclude that the main quenching process in the Ce:YAGG is caused by the thermally stimulated ionization process with activation energy of 90 meV from the 5d(1) to the conduction band, and that in the Ce:YGG is caused by the direct ionization process from the 5d levels to the conduction band.

References

1. J Phys Condens Matter. 2011 Jun 1;23(21):215502 - PubMed

Publication Types

• Journal Article