Thermally Stable Hole-Transporting Material for Organic Light-Emitting Diode: an Isoindole Derivative

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• 作者：Bao-Xiu Mi ; Peng-Fei Wang ; Man-Wah Liu ; Hoi-Lun Kwong ; Ning-Bew Wong ; Chun-Sing Lee ; and Shuit-Tong Lee
• 刊名：Chemistry of Materials
• 出版年：2003
• 出版时间：August 12, 2003
• 年：2003
• 卷：15
• 期：16
• 页码：3148 - 3151
• 全文大小：104K
• 年卷期：v.15,no.16(August 12, 2003)
• ISSN：1520-5002

文摘

A new hole-transporting material, 1,3,4,5,6,7-hexaphenyl-2-{3'-(9-ethylcarbazolyl)}-isoindole (HPCzI), has been synthesized. The new compound is a highly phenylated isoindolewith good thermal and chemical stabilities. Thermal analysis using scanning calorimetryshows the compound to have a high melting point at 311.5 C. Its bulky structure leads togood film-forming properties of the compound via thermal evaporation. Aside from the highhole mobility, the compound possesses other important attributes required for a good hole-transporting host material for applications in organic electroluminescence. The photophysicalproperty of HPCzI and its performance as a hole-transporting material in a double-layeredelectroluminescent device were investigated. At a drive voltage of 8.8 V and a current densityof 20 mA/cm², the device with a configuration of ITO/HPCzI/AlQ₃/MgAg (30 /:700 Å:700Å:2000 Å) showed a green AlQ₃ emission with a current efficiency of 3.5 cd/A.