Fig. 25. (a) PL spectra of P3HT (10 mg ml⁻¹), C-CQDs (1 mg ml⁻¹) and P3HT:C-CQDs (P3HT: 10 mg ml⁻¹, C-CQDs content: 0, 2.5, 5, and 10 wt% vs. P3HT) composite films at an excitation of 450 nm. (b) UV-Vis absorption spectra of P3HT and P3HT:C-CQDs (1 : 5%) in the solid state (this figure has been adapted/reproduced from ref. 151 with permission from Elsevier, Copyright 2018).