Stacked inverted top-emitting green electrophosphorescent organic light-emitting diodes on glass and flexible glass substrates

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• 作者：Keith A. Knauer ; Ehsan Najafabadi ; Wojciech Haske ; Michael P. Gaj ; Kendall C. Davis ; Canek Fuentes-Hern ; ez ; Ulises Carrasco ; Bernard Kippelen
• 关键词：Stacked ; Inverted ; Organic light-emitting diode ; Flexible glass ; Green ; Electrophosphorescent
• 刊名：Organic Electronics
• 出版年：2013
• 出版时间：October, 2013
• 年：2013
• 卷：14
• 期：10
• 页码：2418-2423
• 全文大小：553 K

文摘

Stacked inverted top-emitting green electrophosphorescent organic light-emitting diodes (OLEDs) are demonstrated on glass and flexible glass substrates. A single-unit OLED is shown to have a current efficacy of 46.8 cd/A at a luminance of 1215 cd/m². When two of these OLEDs are stacked, the double-unit OLED exhibits a current efficacy more than twice that of the single-unit OLED, with a current efficacy of 97.8 cd/A at a luminance of 1119 cd/m². With the addition of 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) on top of the semitransparent gold anode, the double-unit stacked OLED achieves a maximum current efficacy of 205 cd/A at a luminance of 103 cd/m², maintaining a high current efficacy of 200 cd/A at a luminance of 1011 cd/m². These stacked inverted OLED combine the advantages of inverted OLEDs with the benefits of having a stacked architecture.