Improved OLED Efficiency and Lifetime with Doped Electron Blocking Layer

Description

Compounds capable of absorbing and/or emitting light are ideal for optical and electroluminescent devices, such as organic light emitting diodes (OLEDs). Much research has been devoted to the discovery and optimization of organic and organometallic materials for use in optical and electroluminescent devices. However, despite significant advances, most materials still exhibit a number of disadvantages, such as limited processing ability, poor material stability, and inefficient emission or absorption. An electron block layer (EBL) is commonly used to improve OLED technology by confining electrons (charge carriers) to the emissive layer. This improves efficiency by increasing the probability of electron-hole recombination in that layer. However, EBL technology and methods are limited, and further improvements are still needed in order to improve the emission efficiency and lifetime of OLED devices.

Researchers at Arizona State University have developed a new OLED architecture that uses mixed electron blocking layers to improve the blue and white OLED device efficiency and operational lifetime. The EBL material is doped with an emissive material, such as TBPe, and controlled to ensure that it does not quench excitons in the emissive layer. The use of a small dopant level for the EBL can alleviate charge imbalance in the emissive material, thus improving the lifetime of devices while maintaining efficiency.

Potential Applications

  • Smart devices
  • Electronic devices
  • Flexible displays
  • Lighting

Benefits and Advantages

  • Extended Lifetime - Device lifetime can be extended up to 50%.
  • Maintains Emission Efficiency – Controlled levels of the dopant lead to optimal emission efficiency.
  • Increased Stability – Provides increased stability, particularly for blue and white OLED devices.

For more information about the inventor(s) and their research, please see

Dr. Jian Li's directory webpage

Case ID:
M16-093P
Published:
12-10-2016
Last Updated:
12-05-2018

Inventor(s):

Jian Li

Patent Information

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