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Cooperative emission study in ytterbium doped NdVO4 |
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| Authors: | Y Lévesque M Bettinelli |
| Institution: | a Université de Sherbrooke, Département de Physique, 2500 Boulevard Université, Sherbrooke, Canada J1K 2R1 b Laboratory of Solid State Chemistry, DB, Università di Verona and INSTM, UdR Verona, Ca' Vignal, Strada Le Grazie 15, 37134 Verona, Italy |
| Abstract: | The infrared and visible cooperative emissions of ytterbium ions are studied in Yb-doped NdVO4 single crystals. The absorption of optical phonons allows the emissions at room temperature when a Nd:YAG laser is used. Low temperature emissions are observed due to the Nd3+→Yb3+ energy transfer following an argon ion laser excitation of the Nd3+ ions. Analysis of the cooperative emission at low doping concentration (1%) indicates that it is generated by distant pair forming Yb3+ ions while at high doping concentration (≥ 5%) close ions magnetically coupled and superexchange mechanisms prevail in the emitting process. |
| Keywords: | Cooperative emission Crystal field Superexchange ion pairs |
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