Figure 3: MQW nanowire photoluminescence.
From: Multi-quantum-well nanowire heterostructures for wavelength-controlled lasers
a, Photoluminescence images (false colour) recorded from GaN/In0.05Ga0.95N (left) and GaN/In0.23Ga0.77N (right) MQW nanowire structures. Scale bars are 5 μm. b, Normalized spectra collected from three representative 26MQW nanowire structures with increasing In composition; excitation power density ∼150 kW cm−2. c, Photoluminescence spectra of a 26MQW nanowire recorded at excitation power densities of 250 and 1,300 kW cm−2, respectively. Spectra are offset for clarity. Inset: Log–log plot of output power versus pump power density. Red open circles are experimental data points and the dashed line is the fit calculated with the rate equations. d, Normalized photoluminescence spectra collected from four representative 26MQW nanowire structures with increasing In composition pumped at ∼250 kW cm−2 and ∼700 kW cm−2, respectively. Spectra are offset for clarity.
