AlF3: 0.2Tm3+, 10Yb3+ particles were prepared by pulsed laser ablation (PLA). Under a 978 nm laser diode excitation, intense ultraviolet and weak blue up-conversion emissions were observed in the AlF3: 0.2Tm3+, 10Yb3+ particles. Intensity dependence of the up-conversion emissions on the pump power was measured. The results show that the population of the states I-1(6), D-1(2) and (1)G(4) may come from a five-photon, four-photon and three-photon energy transfer up-conversion process. (C) 2003 Elsevier Science Ltd. All rights reserved. References: 11
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