Time-resolved luminescence spectroscopy of the nearly one-dimensional crystal [(CH3)3NH]MnCl3.2H2O

Absorption and luminescence were investigated in a nearly one-dimensional antiferromagnetic crystal [(CH 3 ) 3 NH]MnCl 3 .2H 2 O. The luminescence decay process was studied by time-resolved spectroscopy using a streak camera. An intrinsic emission band with a peak at 661 nm was observed by the excitation in the Mn 2+ absorption band at 15 K. This emission shifts towards a higher energy as the temperature is increased. Transfer of electronic excitation energy was found to occur in the high-temperature range above 90 K where short-range order becomes ineffective. An emission from Mn 2+ traps, which is caused by the energy transfer from the bulk Mn 2+ ions, was observed spectrally separately from the Mn 2+ intrinsic emission.