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Fig. 2 | Nanoscale Research Letters

Fig. 2

From: Stable and Reversible Photoluminescence from GaN Nanowires in Solution Tuning by Ionic Concentration

Fig. 2

Schematic illustration of the effect of ion concentration on photoluminescence intensity. E is energy. Ec, Ev, and εF are conduction band edge, valance band edge, and Fermi level respectively. a Surface depletion region caused by the trapped electrons in the surface states. b Depletion region neutralized by the attachment of positives ions H+ or K+. c Electron transfer to the redox level of H+

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