Fig. 3From: Stable and Reversible Photoluminescence from GaN Nanowires in Solution Tuning by Ionic ConcentrationComparison of PL intensity from different sizes and dimensions of GaN. a The PL intensity distribution in various pH values of acidic solutions on bigger GaN nanowires with diameters of ~ 200 nm. b A comparison of PL intensity for GaN nanowires, GaN films and bigger GaN nanowires in HNO3 and HClBack to article page