Abstracts 2001

Abstract of Publication No. 410

C. Reinhard, P. Gerner, R. Valiente, O. S. Wenger and Hans U. Güdel
Upconversion phenomena in the Yb3+ doped transition metal compounds Rb2MnCl4 and CsMnBr3
J. Lumin. 94-95, 331-335 (2001)      Full Text (PDF)      DOI-Link     

Abstract: Crystals of Yb3+ doped Rb2MnCl4 and CsMnBr3 show orange-red Mn2+ 4T1g 6A1g upconverted luminescence under near-infrared Yb3+ excitation. By short 10 ns pulse excitations the upconversion (UC) process for both compounds has been determined to consist of a sequence of ground and excited-state absorption steps. This mechanism can gain nonzero probability by assuming an exchange mechanism between Yb3+ and Mn2+. The efficiency of the UC process is dependent on the structural nature of the Yb3+-Mn2+ connection. It is three orders of magnitude more efficient in Rb2MnCl4: Yb3+ with a corner-sharing Yb3+-Cl-Mn2+ arrangement than in the face-sharing Yb3+-Br3-Mn2+ arrangement of CsMnBr3:Yb3+.

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