Organic electroluminescent devices with polymer buffer layer

Yoshiharu Sato; Tomoyuki Ogata; Junji Kido

doi:10.1117/12.416886

2 February 2001 Organic electroluminescent devices with polymer buffer layer

Yoshiharu Sato, Tomoyuki Ogata, Junji Kido

Proceedings Volume 4105, Organic Light-Emitting Materials and Devices IV; (2001) https://doi.org/10.1117/12.416886
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States

Abstract

We have developed a new type of polymers having TPD unit combined with non-conjugated spacer group, poly(arylene ether sulfone)-containing and poly(arylene ether ketone)- containing tetraphenylbenzidine (PTPDES an PTPDEK) and also polymers with directly coupled triphenyl amine units (PPBA). When these polymers are mixed with strong acceptor such as TBPAH or DDQ, they indicated higher conductivity and facilitated hole injection from ITO to the hole transport layer. Spin-coating of such polymer from an organic solution on ITO was found to improve the surface roughness of ITO, resulting in reduced defects that cause electric short circuit between ITO and cathode. These buffer materials lowered the operation voltage and improved the thermal stability of the device. After storage of 1,000 hours at 85 degrees Celsius, the device with polymer buffer showed no degradation in luminance and small increase of operation voltage. In comparison with CuPc buffer, it is clear that the doped polymer is superior in terms of both efficiency and thermal stability.

Citation Download Citation

Yoshiharu Sato, Tomoyuki Ogata, and Junji Kido "Organic electroluminescent devices with polymer buffer layer", Proc. SPIE 4105, Organic Light-Emitting Materials and Devices IV, (2 February 2001); https://doi.org/10.1117/12.416886

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