Fig. 1
From: Stable and Reversible Photoluminescence from GaN Nanowires in Solution Tuning by Ionic Concentration
The PL intensity distribution in different pH values of acidic solutions and salt solutions at different concentrations. He–Ca laser is used here and below as the excitation light source for continuous-wave output at a wavelength of 325 nm. a The PL response from GaN nanowires with diameters ranging between 60 and 80 nm in acidic solutions. b The PL response from GaN films with ~ 300 μm in thickness in acidic solutions. c The PL response from GaN nanowires in salt solutions with different concentrations. d The PL response from GaN films in salt solutions with different concentrations