Figure 4From: Tuning photoluminescence of organic rubrene nanoparticles through a hydrothermal process PL spectra. The filtered-up and filtered-down (a) pristine rubrene NPs and (b) HT-110, (c) HT-130, (d) HT-150, (e) HT-160, and (f) HT-180 rubrene NPs. Insets: Photographs of light emission for the corresponding rubrene NPs.Back to article page