Color-Stable Organic Light Emitting Diode Stack

摘要

The present invention relates to OLED devices and stacks for OLED devices that include a symmetric emissive-layer architecture. In one embodiment, the present invention relates to an emissive stack having three layers, wherein the top and bottom layers emit light in the same or similar color region while the middle layer emits light in a different color region than the other two layers. In such an embodiment, the three layers are in contact with each other with no other layers in between. The symmetric emissive-layer architecture of the present invention can be used to improve the color stability of OLED devices.

主权项

1. An organic light emitting device, comprising:
a first electrode; a first emissive stack disposed over the first electrode; and a second electrode disposed over the first emissive stack; wherein the first emissive stack consists of N emissive layers in contact and in sequence from the first electrode side; wherein N is an integer of at least 3; wherein the first emissive layer in the first emissive stack nearest the first electrode and the Nth emissive layer in the first emissive stack nearest the second electrode emit light in the same color region, and wherein at least one emissive layer in the first emissive stack other than the first and the Nth emissive layers emits light in a different color region than the first and the Nth emissive layers.