Cross linkable phosphorescent polymer-LEDs based on a soluble new iridium complex ((Btp)2Ir(III)(acac)-Ox)

Young Jun Yu, Olga Solomeshch, Vladislav Medvedev, Alexey Razin, Nir Tessler, Kyu Nam Kim, Dong Hoon Choi, Jung Jin

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

PVK is a prototypical host for polymer based phosphorescent OLEDs. We report the photo (PL) and electroluminescence (EL) properties of phosphorescent organic light emitting diodes (OLEDs) based on poly(vinylcarbazole) (PVK) derivatives doped with cyclometalated Ir(III) complexes. To allow for stable morphology as well as photopatternability, both the host and guest materials were rendered cross-linkable by attaching a cross linking oxetane moiety. Regarding the PVK matrix we also used a new derivative (PVK-Cin) of poly(vinylcarbazole) (PVK) that was prepared by tethering cinnamate pendants to the carbazole group through an octylene spacer. While the use of the oxcetane moieties attached to the ligands of the Ir complex slightly improves the luminescence efficiency, the use of oxcetane derivatized PVK and the associated catalyst result in poor performance. In contrast, the use of the (catalyst free) cinnamate derivatized PVK results in high efficiency cross-linked PLEDs with efficiency higher than 4.5 cd/A. Photopatternability of the new PVK based-polymer was investigated through photocrosslinking reaction under UV light illumination (= 254 nm). The blends of PVK-Cin and a soluble (Btp) 2Ir(III)(acac)Ox were employed for studying a photocrosslinking behavior. We observed that PVK-Cin readily undergoes 2π + 2π cycloaddition when exposed to the UV light (λmax = 254 nm) at 110 °C without photoinitiator.

Original languageEnglish
Title of host publicationMaterials Research Society Symposium Proceedings
Pages203-211
Number of pages9
Volume1129
Publication statusPublished - 2009 Nov 23
EventMaterials and Devices for Smart Systems III - 2008 MRS Fall Meeting - Boston, MA, United States
Duration: 2008 Dec 12008 Dec 4

Other

OtherMaterials and Devices for Smart Systems III - 2008 MRS Fall Meeting
CountryUnited States
CityBoston, MA
Period08/12/108/12/4

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ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Mechanics of Materials

Cite this

Yu, Y. J., Solomeshch, O., Medvedev, V., Razin, A., Tessler, N., Kim, K. N., ... Jin, J. (2009). Cross linkable phosphorescent polymer-LEDs based on a soluble new iridium complex ((Btp)2Ir(III)(acac)-Ox). In Materials Research Society Symposium Proceedings (Vol. 1129, pp. 203-211)