Phosphine Oxide Based Electron Transporting and Hole Blocking Materials for Blue Electrophosphorescent Organic Light Emitting Devices

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• 作者：Amber L. Von Ruden ; Lelia Cosimbescu ; Evgueni Polikarpov ; Phillip K. Koech ; James S. Swensen ; Liang Wang ; Jens T. Darsell ; Asanga B. Padmaperuma
• 刊名：Chemistry of Materials
• 出版年：2010
• 出版时间：October 26, 2010
• 年：2010
• 卷：22
• 期：20
• 页码：5678-5686
• 全文大小：990K
• 年卷期：v.22,no.20(October 26, 2010)
• ISSN：1520-5002

文摘

We report the design, synthesis, thermal, and photophysical properties of two phosphine oxide based electron transport/hole blocking materials, 2,6-bis(4-(diphenylphosphoryl)phenyl)pyridine (BM-A11) and 2,4-bis(4-(diphenyl-phosphoryl)phenyl)pyridine (BM-A10), for blue electrophosphorescent organic light emitting devices (OLEDs). The use of these materials in blue OLEDs with iridium(III) bis[(4,6-difluorophenyl)-pyridinato-N,C²′]picolinate (Firpic) as the phosphor was demonstrated. Using the dual host device architecture with BM-A10 as the electron transport material (ETM) yields a maximum external quantum efficiency (EQE) of 8.9% with a power efficiency of 21.5 lm/W (4.0 V and 35 cd/m²). When BM-A11 is used as the ETM, the maximum EQE and power efficiency improves to 14.9% and 48.4 lm/W, respectively (3.0 V and 40 cd/m²).