  We investigate exciton dynamics in 2H-WSe2 bilayers in time-resolved
photoluminescence (PL) spectroscopy. Fast PL emission times are recorded for
both the direct exciton with $\tau_{D}$ ~ 3 ps and the indirect optical
transition with $\tau_{i}$ ~ 25 ps. For temperatures between 4 to 150 K
$\tau_{i}$ remains constant. Following polarized laser excitation, we observe
for the direct exciton transition at the K point of the Brillouin zone
efficient optical orientation and alignment during the short emission time
$\tau_{D}$. The evolution of the direct exciton polarization and intensity as a
function of excitation laser energy is monitored in PL excitation (PLE)
experiments.
