An Ionic Molecular Glass as Electron Injection Layer for Efficient Polymer Light-Emitting Diode

✍ Scribed by Gang Liu; Ai-Yuan Li; Ding An; Hong-Bin Wu; Xu-Hui Zhu; Yuan Li; Xin-Rui Miao; Wen-Li Deng; Wei Yang; Yong Cao; Jean Roncali

• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 402 KB
• Volume: 30
• Category: Article
• ISSN: 1022-1336
• DOI: 10.1002/marc.200900253

✦ Synopsis

Abstract

An ionic molecular glass based on a dendronized monoammonium salt has been facilely synthesized and utilized as an interfacial electron‐injection layer in a light‐emitting diode (LED). The characterization of a yellow‐green LED that involves an Al cathode and a thin layer of the new compound spin cast from a methanol solution has shown device performances comparable to those obtained with a Ba/Al cathode. Photovoltaic measurements under white light irradiation reveal that a thin layer of the new compound can significantly increase the built‐in potential and thus facilitate electron injection from an Al cathode. Furthermore, it is interesting to observe that the new ionic salt could undergo reorganization on the emissive conjugated polymer layer, which leads to the formation of nearly uniform nanoaggregates.

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