OVJP for printing graded/stepped organic layers

摘要

An emissive layer deposited in graded manner using a plurality of nozzles is disclosed. A mixtures ejected from the plurality of nozzles may contain varying concentrations of host-to-dopant material. The nozzles, as disclosed, may be arranged in a sequential manner such that the order of the sequence is based on varying concentration of the host-to-dopant material. The nozzles may be configured to translate relative to an area of a substrate to allow sequential deposition.

主权项

1. A device comprising:
a first nozzle configured to eject a first mixture over a first region of a substrate, the first mixture comprising a host and an organic dopant; and a second nozzle configured to eject a second mixture over the first region of the substrate, the second mixture comprising the host and the organic dopant; wherein the device is configured to create the first and second mixtures, with the first mixture comprising a different ratio of host to organic dopant than the second mixture, and wherein the first and second nozzles deposit graded organic layers from the first and second mixtures, where each layer is deposited by a different nozzle and each layer contains substantially the same amount of total host and dopant material, but the ratios and components of the organic material vary from one layer to another.