(Lu 1-xYb x) 3Al 5O 12 (Yb:LuAG), (Y 1-xYb x)AlO 3 (Yb:YAP), (Y 0.9Yb 0.1)VO 4 (Yb:YVO) and Ca 8(La 1.98Yb 0.02)(PO 4) 6O 2 (Yb:CLPA) single crystals were grown from the melt. Typical double peak spectrum of the Yb 3+ Charge Transfer (CT) luminescence was observed in Yb-doped LuAG and YAP. Strong dependence of decay time and intensity on temperature was observed. Concentration quenching effect in Yb-rich Yb:YAP samples results in pronounced 1/e decay time shortening below 230 K, while above this temperature the decay curves are shaped mostly by the thermal quenching process. Double peak emission spectrum was not observed in Yb:YVO and Yb:CLPA. In the case of CLPA, under excitation in the Yb 3+ CT absorption band round 270 nm both the fast (6 ns decay time) and slow components (about 150 μs+600 μs decay times) are observed at room temperature. CLPA emission intensity was not decreasing with temperature between 80 and 300 K. Mixing of the Yb 3+ CT and CLPA excitonic states is proposed to explain this interesting phenomenon.
|Number of pages||5|
|Journal||Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment|
|Issue number||1-2 SPEC. ISS.|
|Publication status||Published - 2005 Jan 21|
- Charge transfer
- Single crystal growth from melt