Transferable membranes were separated from the GaN epitaxial sheet with lift-off (LLO) technology. After the LLO process, the GaN membrane was removed onto various substrates, and then we can create different interfacial conditions, such as GaN attached with Si and GaN attached to Au. The substrate dependent photoluminescence (PL) properties of GaN membranes are studied by PL and time-resolution photoluminescence (TRPL) measurements in situ. Lasing oscillations are observed in the GaN membranes. The lasing features - which include the lasing spectra, Q factor, laser threshold, mode number, car...
