Donor bound excitons involving a hole from the B valence band in ZnO: Time resolved and magneto-photoluminescence studies

Time-resolved and magneto-photoluminescence (PL) studies are performed for the so-called I 6 B and I 7 B excitonic transitions, previously attributed to neutral donor bound excitons involving a hole from the B valence band (VB), D 0 X B . It is shown that PL decays of these emissions at 2 K are faster than that of their I 6 and I 7 counterparts involving an A VB hole, which is interpreted as being due to energy relaxation of the hole assisted by acoustic phonons. From the magneto-PL measurements, values of effective Landé g factors for conduction electrons and B VB holes are determined as g e =1.91, g h / / = 1 . 79 , and g h ⊥ = 0 , respectively.