High-performance inverted top-emitting green electrophosphorescent organic light-emitting diodes with a modified top Ag anode

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• 作者：Ehsan Najafabadi ; Keith A. Knauer ; Wojciech Haske ; Bernard Kippelen ; ^{kippelen@ece.gatech.edu}
• 关键词：Organic light-emitting diodes (OLEDs) ; Inverted ; Top-emitting ; Green phosphorescent emitter ; HAT-CN ; Hole-injection layer
• 刊名：Organic Electronics
• 出版年：2013
• 出版时间：May, 2013
• 年：2013
• 卷：14
• 期：5
• 页码：1271-1275
• 全文大小：241 K

文摘

Green electrophosphorescent inverted top-emitting organic light-emitting diodes with a Ag/1,4,5,8,9,11-hexaazatriphenylene hexacarbonitrile (HAT-CN) anode are demonstrated. A high current efficacy of 124.7 cd/A is achieved at a luminance of 100 cd/m² when an optical outcoupling layer of N,N¡ä-di-[(1-naphthyl)-N,N¡ä-diphenyl]-1,1¡ä-biphenyl-4,4¡ä-diamine (¦Á-NPD) is deposited on the anode. The devices have a low turn-on voltage of 3.0 V and exhibit low current efficacy roll-off through luminance values up to 10,000 cd/m². The angle dependent spectra show deviation from Lambertian emission and color change with viewing angle. Hole-dominated devices with Ag/HAT-CN electrodes show current densities up to three orders of magnitude higher than devices without HAT-CN.