Patent ID: 11201306

Abstract:
The present invention relates to a display device comprising—a plurality of OLED pixels comprising at least two OLED pixels, the OLED pixels comprising an anode, a cathode, and a stack of organic layers, wherein the stack of organic layers—is arranged between and in contact with the cathode and the anode, and—comprises a first electron transport layer, a first hole transport layer, and a first light emitting layer provided between the first hole transport layer and the first electron transport layer, and—a driving circuit configured to separately driving the pixels of the plurality of OLED pixels, wherein, for the plurality of OLED pixels, the first hole transport layer is provided in the stack of organic layers as a common hole transport layer shared by the plurality of OLED pixels, and the first hole transport layer comprises (i) at least one first hole transport matrix compound consisting of covalently bound atoms and (ii) at least one electrical p-dopant selected from metal salts and from electrically neutral metal complexes comprising a metal cation and at least one anion and/or at least one anionic ligand consisting of at least 4 covalently bound atoms, wherein the metal cation of the electrical p-dopant is selected from alkali metals; alkaline earth metals, Pb, Mn, Fe, Co, Ni, Zn, Cd; rare earth metals in oxidation state (II) or (III); Al, Ga, In; and from Sn, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and W in oxidation state (IV) or less, a method for preparing the display device and a chemical compound for use therein.