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Highly Efficient Polymer Light-Emitting Devices Using a New Phosphorescent Material |
WANG Jian-Hua;DUAN Lian;WANG Li-Duo;QIU Yong |
Organic Optoelectronics Laboratory, Department of Chemistry, Tsinghua University, Beijing 100084 |
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Cite this article: |
WANG Jian-Hua, DUAN Lian, WANG Li-Duo et al 2003 Chin. Phys. Lett. 20 1141-1143 |
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Abstract A new phosphorescent material bis(2-phenyl-benzoimiazole) acetylacetonato iridium ((PBI)2IrAcac) is designed and synthesized. The absorption, photoluminescence and electroluminescence are measured. The polymer-based light-emitting devices which use polyvinylcarbazole (PVK) as host and (PBI)2IrAcac as emitter were fabricated. These light-emitting devices show a bright green emission at 548 nm. The device ITO/(PBI)2IrAcac:PVK/BCP/ Alq3/Mg:Ag shows a very high efficiency. A peak external quantum efficiency of 21.5 cd/A (5.8%) was obtained at 0.1 mA/cm2. The maximum brightness is 3840 cd/m2.
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Keywords:
78.60.Fi
78.55.-m
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Published: 01 July 2003
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PACS: |
78.60.Fi
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(Electroluminescence)
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78.55.-m
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(Photoluminescence, properties and materials)
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