Figure 5: Photographs of the LEDs.

(a) An illuminating 3 mm reference ultraviolet LED (turned-on emission has a blue tinge). (b) The same LED coated with a thin layer of sample of 3.5 wt% [Ir(ppy)₂(bpy)]⁺@1 (not turned on). (c) The coated LED was turned on and illuminates bright white light.