This article content is the continuation of our earlier Scientific News Blog (SNB).  Prof. Hashem Shahroosvand and his research team, from the University of Zanjan, Iran, Group for Molecular Engineering of Advanced Functional Materials (GMA) have surveyed about on Polypyridyl ligands that can be used for solid-state light-emitting devices ( SS-LEDs). Among all of the emitters reported to-date, cyclometalate complexes have attracted significant and considerable interest in the novel photophysical properties which are well suited for a broad range of applications [ 1 , 2 ]. Hundreds of organometallic compounds have been reported, since the first discovery of highly efficient organic light-emitting diodes (OLEDs) prepared from cyclometalate Ir(III) complexes [ 3 ]. Cyclometalate complexes have the general formula [M(X) 3-n (Y) n ] x+  which are comprised of a metal cation (M x+ ), a bidentate chelating ligand involved in at-least one organometallic carbon-to-metal bond, as well a...