Thick-ETL OLEDs with sub-ITO grids with improved outcoupling

US10038167B2 · kind B2 · utility

Assignee

• THE REGENTS OF THE UNIVERSITY OF MICHIGAN · US

Inventors

• Stephen R. Forrest · Ann Arbor, US
• Yue Qu · Zhuhai, CN
• Michael Slootsky · Tenafly, US

Key dates

• Filing date: Jan 8, 2016
• Grant date: Jul 31, 2018
• Expiry date: Mar 20, 2036

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10K2102/103

Abstract

An organic light emitting device is described. In certain embodiments, the device has a transparent substrate, a transparent grid layer disposed over the substrate, and an OLED disposed over the grid layer. The OLED can include an anode, a cathode, and at least one organic layer between the anode and cathode. A refractive index of the transparent grid layer is less than or equal to a refractive index of the transparent substrate. In certain embodiments, the at least one organic layer includes an electron transport layer having a thickness of at least 50 nm. In certain embodiments, the refractive index of the transparent grid layer is less than n=1.20, or in certain embodiments, less than n=1.05. Methods of manufacturing an organic light emitting device are also described.