☆ 4.6 Article

Thermally Decomposable Lithium Nitride as an Electron Injection Material for Highly Efficient and Stable OLEDs

JOURNAL OF PHYSICAL CHEMISTRY C (2009)

期刊

JOURNAL OF PHYSICAL CHEMISTRY C

卷 113, 期 30, 页码 13386-13390

出版社

AMER CHEMICAL SOC

DOI: 10.1021/jp901510j

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Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary

资金

National Basic Research and Development Program of China [2006CB806203, 2008AA03A327, 2009CB623604]

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Reagent

摘要

Improvement of electron injection is essential for highly efficient low-voltage organic light-emitting diodes (OLEDs). In this work, we report our study on thermally decomposable Li3N as the electron injection layer (EIL) for OLEDs. We use a quartz crystal microbalance method to investigate the decomposition process of Li3N during vacuum thermal evaporation in situ. Thermodynamics study also proves that Li3N decomposes in vacuum to form metallic lithium and nitrogen. OLEDs with Li3N as the EIL outperform those with conventional LiF in every respect of view. An optimized green OLED with a Li3N EIL shows 35% higher efficiency and more than doubled lifetime compared with the control device with a LiF EIL.

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