Abstracts 1997

Abstract of Publication No. 291

Toni Riedener, Philipp Egger, Jürg Hulliger and Hans U. Güdel
Upconversion mechanisms in Er3+-doped Ba2YCl7
Phys. Rev. B 56, 1800-1808 (1997)      Full Text (PDF)      DOI-Link     

Abstract: Efficient near infrared to visible upconversion luminescence is reported in the low phonon-energy host material Ba2YCl7:x% Er3+ (x=1, 10, 100). The upconversion mechanisms upon 4I9/2 excitation ( 800 nm) are investigated by means of excitation and time-resolved luminescence spectroscopy. 2H9/2 is found to be populated by energy transfer upconversion and excited-state absorption, depending on the excitation energy. Characteristic excited-state absorption peaks in the excitation spectra are used as a fingerprint to determine the population mechanisms for the other states with high luminescence intensities: 4S3/2/2H11/2, 4F9/2, and 4G11/2. The assignment is confirmed by temperature, concentration, power, and time-dependent measurements. The relative intensities are accounted for by a Judd-Ofelt analysis.

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