Patent ID: 8883320
Filing Date: 2014-11-11
Classification: C09K,H01L,H05B,Y10S

Abstract:
1. A light emitting device comprising: an anode; a cathode; a light emissive layer located between the anode and the cathode, said light emissive layer comprising a charged metal complex for emitting light and a counterion or counterions with sufficient charge to balance the charge on the charged metal complex; wherein the counterion or counterions are substantially immobile so that light output from the device is immediate, provided that the combined charged metal complex and counterion do not have General Formula I or II: where C—N is a cyclometallated ligand, the charged metal complex containing a metal M and coordinated ligands L, the metal M is selected from the group consisting of ruthenium, copper, chromium, molybdenum, rhodium, palladium, rhenium, osmium, iridium, platinum, gold, aluminum, beryllium, zinc, mercury, cadmium, and gallium, and the counterion is bound to a monodentate, bidentate, or tridentate ligand in the metal complex, wherein the bidentate ligand has one of the following formulae: