No abstract

The simplest and the most efficient deep-red to near-infrared-emitting emitters afford a new record external quantum efficiency for iridium(iii) complex based deep-red to near-infrared organic light-emitting diodes.

Tw o-dimensional (2D) nanomaterials are attracting mucha ttention due to their excellent electronic and optical properties.H ere,w er eport the first experimental preparation of two free-standing mercurated graphyne nanosheets via the interface-assisted bottom-up method, which integrates both the advantages of metal center and graphyne.T he continuous large-area nanosheets derived from the chemical growth show the layered molecular structural arrangement, controllable thickness and enhanced p-conjugation, whichr esult in their stable and outstanding broadband nonlinear saturable absorption (SA) properties (at both 532 and 1064 nm). The passively Q-switched (PQS) performances of these two nanosheets as the saturable absorbers are comparable to or higher than those of the state-of-the-art 2D nanomaterials (suchasgraphene,black phosphorus,MoS 2 , g-graphyne,etc.). Our results illustrate that the two metallated graphynes could act not only as anew class of 2D carbon-richmaterials,but also as inexpensive and easily available optoelectronic materials for device fabrication.