Abstract
Using various ultraviolet laser excitation lines between 199.8 nm (50 034 cm-1) and 266 nm (37 583 cm-1), emission transitions have been observed and assigned for the first time from the 3P2 term of Tm3+, located near 37 500 cm-1. The most intense transitions are to the terminal 3H6 and 3F4 states, and are almost entirely vibronic in character for Tm3+ in elpasolite cubic lattices. In other systems, these transitions may find application in ultraviolet lasers. The interpretation of the 3P2 → 3H4 emission transition in Cs2NaTmCl6 reveals electron−phonon coupling phenomena analogous to that in the 3H6 ground state, and which provides the explanation for the enormous deviation between the experimental and calculated energy of the 3H4 Γ4 level. We also report the quantum cutting of blue to infrared radiation in Cs2LiTmCl6 and the upconversion from 1D2 to 3P2 in Cs2NaTmCl6.
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