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A pulsed, red excitation of U 3+ -doped LaCl 3 crystal at 16 240 cm −1 ( 4 I 9/2 → 2 K 13/2 ) produces a green emission at 18 180 cm −1 ( 2 K 15/2 → 4 I 9/2 ). A similar effect of up-conversion has been found under an IR YAG:Nd excitation ( 4 I 9/2 → 2 H 9/2 ). The induced...
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