Abstract The unique electron-transport and emissive properties of tris (8-quinolinolate) aluminum (III)(Alq 3) have resulted in extensive use of this material for small molecular organic light-emitting diode (OLED) fabrication. So far, efforts to prepare stable and easy-to- process red/green/blue (RGB)-emitting Alq 3 derivatives have met with only a limited success. In this paper, we describe how the electronic nature of various substituents, ...