Patent ID: 9136477
Filing Date: 2015-09-15
Classification: C09K,H01L,H05B

Abstract:
1. An organic light emissive device for providing white light, which comprises: an anode; a cathode; and an organic light emissive region between the anode and the cathode, which region comprises an electroluminescent material comprising a polymer which emits blue light, and an electroluminescent material which emits red light, and a colour shifting unit, wherein the blue or red light emitted is colour shifted by the colour shifting unit comprising a color shifting unit component material forming a copolymer with at least one of the polymer which emits blue light or the electroluminescent material which emits red light, the copolymer having a monomer repeat ratio of the color-shifting unit component material to the polymer or the electroluminescent material ranging from 1 to 20%, and in which the red light emitting electroluminescent material has a shallow LUMO level of less than 2.5 eV, and wherein the colour shifting unit comprises a stilbene unit.