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Novel Aromatic Amines for Photoconductor and Organic Electronic Applications

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Aromatic amines are frequently used as hole conductors in copiers and laser printers. In the last decade there has been increasing interest to extend the use of aromatic amines to organic light emitting diodes (OLEDs) as well as to organic field-effect transistors (OFETs) developed for printable organic electronics. In this contribution star-shaped aromatic amines which form stable amorphous phases are introduced. Such materials are often called molecular glasses. We have used molecular glasses with triphenylamine, triphenylbenzene and fluorene units as blue emitters and hole blocking materials in OLEDs. The layer thickness of the hole transport and emission layer and the hole blocking layer were optimized in a combinatorial approach which leads to pure blue emitting OLEDs with color coordinates of x=0.15 / y=0.15, a brightness of 400 cd/m2 and an efficiency of 2 cd/A. We have also used molecular glasses with triphenylamine and carbazole units as organic semiconductors in OFETs and obtained environmentally stable transistors with mobilities up to 10−4 cm2/Vs.

Document Type: Research Article

Publication date: 2006-01-01

More about this publication?
  • For more than 25 years, NIP has been the leading forum for discussion of advances and new directions in non-impact and digital printing technologies. A comprehensive, industry-wide conference, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems, including drop-on-demand ink jet, wide format ink jet, desktop and continuous ink jet, toner-based electrophotographic printers, production digital printing systems, and thermal printing systems, as well as the engineering capability, optimization, and science involved in these fields.

    Since 2005, NIP has been held in conjunction with the Digital Fabrication Conference.

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