From these initial reports with quantum yields of <1%, the field has moved on, much higher quantum yields have been realised and the emissive properties have been employed in solvent sensing, luminescent gels and, of course, as emitters in organic light-emitting diodes. Figure Luminescent gold(III) complexes described by Yam et al. Typically Rʹ = H and R = 4-substituted phenyl ring.