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

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• 作者：Lian Duan ; Qian Liu ; Yang Li ; Yudi Gao ; Guohui Zhang ; Deqiang Zhang ; Liduo Wang ; Yong Qiu
• 刊名：Journal of Physical Chemistry C
• 出版年：2009
• 出版时间：July 30, 2009
• 年：2009
• 卷：113
• 期：30
• 页码：13386-13390
• 全文大小：149K
• 年卷期：v.113,no.30(July 30, 2009)
• ISSN：1932-7455

文摘

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.