Stable efficiency roll-off in red phosphorescent organic light-emitting diodes using a spirofluorene–benzofluorene based carbazole type host material

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• 作者：Sang Eok Jang ; Soon Ok Jeon ; Yong Joo Cho ; Kyoung Soo Yook ; Jun Yeob Lee
• 关键词：Red phosphorescent organic light-emitting diode ; Efficiency roll-off ; Carbazole ; Triplet host
• 刊名：Journal of Luminescence
• 出版年：2010
• 出版时间：November 2010
• 年：2010
• 卷：130
• 期：11
• 页码：2184-2187
• 全文大小：373 K

文摘

Red phosphorescent organic light-emitting diodes (PHOLEDs) with stable efficiency roll-off were developed using a spirofluorene–benzofluorene based carbazole type host material. 9-(Spiro[benzo[c]fluorene-7,9′-fluorene]-2′-yl)-9H-carbazole with a spiro[benzofluorene-7,9′-fluorene] and a carbazole unit was synthesized and it was used as the host material for the red PHOLED. The quantum efficiency of the red PHOLED was optimized at a doping concentration of 1 % and the efficiency decrease at 10,000 cd/m² from the maximum efficiency was less than 10 % .