✦ LIBER ✦

Synthesis and Light-Emitting Properties of New Polyimides Containing Ethynylene Units in the Main Chain

✍ Scribed by Jun Ho Chi; Se Hee Park; Chang-Lyoul Lee; Jang Joo Kim; Jin Chul Jung

Publisher: John Wiley and Sons
Year: 2007
Tongue: English
Weight: 227 KB
Volume: 292
Category: Article
ISSN: 1438-7492
DOI: 10.1002/mame.200700067

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Two new polyimides (ODA‐PI and HDA‐PI) having 1,4‐phenylenediethynylene unit and octyloxy groups were synthesized. Judging from inherent viscosities of their precursor PAAs (1.42 and 1.62 dL · g^−1^), the two PIs were very high in molecular weight. Casting and thermal imidization of PAAs results polyimides with good‐quality films. They were stable up to 364 °C and showed no crystallites. UV‐vis and PL spectra in NMP solutions of both PIs showed maxima at 442 and 501 nm, respectively, while PL spectra in ≈10 µm thick films exhibited a maximum at 540 nm. CV indicates that two PIs were electrochemically active in redox region. The devices with construction of ITO/PEDOT/PIs/BAlq~3~/LiF/Al exhibited turn‐on voltages of 6.5 V in ODA‐PI and 7.5 V in HDA‐PI and emitted a bright bluish‐green light. ODA‐PI and HDA‐PI showed maximum luminescence of 256 and 316 cd · cm^−2^, respectively, at the same voltage of 12 V.

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