Highly Efficient Electrophosphorescent Devices with Saturated Red Emission from a Neutral Osmium Complex

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• 作者：Yu-Hua Niu ; Yung-Liang Tung ; Yun Chi ; Ching-Fong Shu ; Joo Hyun Kim ; Baoquan Chen ; Jingdong Luo ; Arthur J. Carty ; and Alex K.-Y. Jen
• 刊名：Chemistry of Materials
• 出版年：2005
• 出版时间：June 28, 2005
• 年：2005
• 卷：17
• 期：13
• 页码：3532 - 3536
• 全文大小：104K
• 年卷期：v.17,no.13(June 28, 2005)
• ISSN：1520-5002

文摘

Highly efficient electrophosphorescent polymer light-emitting diodes (LEDs) with saturated red emission(Commission Internationale de L'Eclairage chromaticity coordinates exactly at x = 0.67, y = 0.33) areachieved by blending a novel neutral Osmium complex into a single-component bipolar polymer hostthat possesses balanced hole- and electron-transporting ability. By using a tetraphenylenebiphenyldiamine(TPD)-based cross-linkable hole-transport layer as well as a layer of 1,3,5-tris(N-phenylbenzimidazol-2-yl)benzene (TPBI) as an electron-transport layer, a device structure with both effective hole/electroninjection and efficient carriers/excitons blocking or confinement at both electrode sides is constituted. Inthis way, external quantum efficiency 12.8% is reached the first time with an organometallic complexwith heavy metal core other than iridium.