The effect of rubidium chloride on properties of organic light-emitting diodes

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• 作者：Zhaoyue Lü ; Zhenbo Deng ; Hailiang Du ; Degang Li ; Ye Zou ; Denghui Xu ; Zheng Chen ; Yongsheng Wang
• 关键词：Organic light-emitting diodes ; Rubidium chloride ; Electron injection ; Efficiency enhancer
• 刊名：Solid-State Electronics
• 出版年：2009
• 出版时间：November 2009
• 年：2009
• 卷：53
• 期：11
• 页码：1154-1158
• 全文大小：521 K

文摘

A multilayer organic light-emitting diode (OLED) was fabricated with a thin rubidium chloride (RbCl) layer inserted inside an electron transport layer (ETL), tris (8-hydroxyquinoline) aluminum (Alq₃). Here, we set d is the distance of the RbCl layer away from the Alq₃/Al interface. The rubidium chloride layer was inserted inside 60 nm Alq₃ at d = 0.0, 2.5, 5.0, 7.5, 10, 20 and 30 nm positions. When the RbCl layer is positioned closer to the Al cathode, both the current density and EL efficiency are enhanced due to the enhanced electron injection. The devices show the electroluminescent (EL) efficiency improvement without an enhanced injection if the value of d is lager than 5.0 nm. The suggested mechanism of RbCl EL efficiency enhancer is carrier trap sites induced by the thin RbCl layer. The trapped charges alter the distribution of the field inside the OLED and, consequently, give better recombination in the device.