ORGANIC LIGHT EMITTING DEVICE HAVING MULTIPLE SEPARATE EMISSIVE LAYERS

摘要

An organic light emitting device having multiple separate emissive layers (420, 430, 440) is provided. Each emissive layer may define an exciton formation region, allowing exciton formation to occur across the entire emissive region. By aligning the energy levels of each emissive layer with the adjacent emissive layers, exciton formation in each layer may be improved. Devices incorporating multiple emissive layers with multiple exciton formation regions may exhibit improved performance, including internal quantum efficiencies of up to 100%.