Fig. 4

OSMWLEs constructed by organic salts. a TPO-Br only, c TPO-I/TPO-Cl and e TPO-I/TPO-P with different counterions molar ratios. Commission Internationale de L’Eclairage (CIE) 1931 coordinates of prompt emission of films: b TPO-Br only, d TPO-I/TPO-Cl and f TPO-I/TPO-P with different molar ratios. Insets show luminescent photographs of these thin films taken under 365 nm UV irradiation