A new spiro[fluorene-9,9¡ä-xanthene]-based host material possessing no conventional hole- and electron-transporting units for efficient and low voltage blue PHOLED via simple two-step synthesis

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• 作者：Yan Qian ; Guohua Xie ; Shufen Chen ; Zhengdong Liu ; Yeren Ni ; Xinhui Zhou ; Linghai Xie ; Jing Liang ; Yuezhi Zhao ; Minghong Yi ; Yi Zhao ; Wei Wei ; Wei Huang
• 关键词：Organic light-emitting diodes ; Host material ; Spiro[fluorene-9 ; 9&prime ; -xanthene]
• 刊名：Organic Electronics
• 出版年：2012
• 出版时间：November, 2012
• 年：2012
• 卷：13
• 期：11
• 页码：2741-2746
• 全文大小：624 K

文摘

A new spiro[fluorene-9,9¡ä-xanthene]-based host material SFX-PF without possessing conventional hole- and electron-transporting units has been developed, via very simple two-step synthesis, for efficient and low voltage blue phosphorescent organic light-emitting device (PHOLED). The blue device exhibited a low turn-on voltage of 2.8 V, and high maximum current efficiency, power efficiency, and external quantum efficiency up to 29.3 cd/A, 28.9 lm/W, and 14.7 % , respectively. At the luminance level of 1000 cd/m², the driving voltages are still lower than 4.0 V with 12.9 % roll-off of the external quantum efficiency. Based on our previous studies, these investigations provide the clues that SFX could be a new building block for designing blue phosphorescent host materials.