Double Spin-Coated Organic Electroluminescent Devices

$20.00 plus tax (Refund Policy)

Buy Article:

Abstract:

New electroluminescent (EL) molecules, dissolved in a high Tg poly(aryl-ketone) (A435), have been used in double spincoated electroluminescent devices. The first EL molecule is a soluble AlQ3 derivative and the second one is a hexaphenyl-substituted isobenzofuran. The maximum solubility of both EL molecules in A435 is about 70 wt%. The typical structure of the devices is: [ITO/HTL/ETL/Mg], where HTL is a new high Tg hole transport aryl amine polymer and ETL is one of the new EL molecules in solid solution in A435. HTL is spin-coated from chloroform while the second layer is spin-coated from toluene. HTL is completely insoluble in toluene. For the devices prepared with the AlQ3 soluble derivative or for the devices prepared with the hexaphenyl-substituted isobenzofuran, the luminance has been found to increase with the EL molecule content (up to 50 ± 5 wt%) in A435. Maximum luminance values higher than 2000 cd/m2 have been measured for the soluble AlQ3 (peak emission at 545 nm) while they reach 1000 cd/m2 for the isobenzofuran derivative (peak emission at 505 nm). The luminance decreases drastically when the EL molecule content in A435 increases above 50 wt%. The current density in both double spin-coated OLEDs is quite large affecting therefore their quantum efficiency. Solutions to improve the quantum efficiency are described.

Document Type: Research Article

Publication date: January 1, 2000

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.

  • Information for Authors
  • Submit a Paper
  • Subscribe to this Title
  • Membership Information
  • Terms & Conditions
  • ingentaconnect is not responsible for the content or availability of external websites

Tools

Favourites

Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more