Spectroscopy and dynamics of Mn(2+) in ZnS nanoparticles.

Both spectra of transient absorption (lambda(max) = 390 nm) and luminescence (lambda(max) = 590 nm) for the (4)T(1) state of Mn(2+) in ZnS nanoparticles shift to long wavelengths by 40 nm and broaden by 1.7 times as the state becomes banded. The (4)T(1) band of capping Mn(2+) in ZnS nanoparticles decays on the time scale of 0.35 mus, which is much shorter than either the decay time of the (4)T(1) state (2000 micros) for lattice-bound isolated Mn(2+) or that (180 micros) for surface-bound isolated Mn(2+) in ZnS nanoparticles.