Using various ultraviolet laser excitation lines between 199.8 rim (50 034 cm(-1)) and 266 nm (37 583 cm(-1)), emission transitions have been observed and assigned for the first time from the P-3(2) term of Tm3+, located near 37 500 cm(-1). The most intense transitions are to the terminal H-3(6), and F-3(4) 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 P-3(2) --> H-3(4) emission transition in Cs2NaTmCl6 reveals electron-phonon coupling phenomena analogous to that in the H-3(6) ground state, and which provides the explanation for the enormous deviation between the experimental and calculated energy of the H-3(4) F-4 level. We also report the quantum cutting of blue to infrared radiation in Cs2LiTmCl6, and the upconversion from D-1(2) to P-3(2) in Cs2NaTmCl6.