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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 54, Number 6
JKCSEZ 54(6)
December 20, 2010 

Synthesis and Properties about Color Stability of m-SiP-PPDFV with Difluoro Groups in Vinylene Units

비닐렌기에 플루오르기를 도입한 m-SiP-PPDFV의 합성과 색 안정성에 대한 물성
Youngeup Jin, Hongsuk Suh*

진영읍, 서홍석*
소자 발광, 고분자 발광소자, 색안정성, PPVs , Electroluminescence, Polymer light-emitting diodes, Color stability, PPVs

New electroluminescent polymers with fluoro groups in vinylene units, poly(m-silylphenyl-p-phenylene-difluorovinylene) (m-SiP-PPDFV) have been synthesized by GILCH polymerization. These polymers have been used as the electroluminescent (EL) layers in single layer light-emitting diodes (LEDs) (ITO/PEDOT/polymer/Ca:Al). m-SiP-PPDFV shows PL around λmax = 452 nm and green EL around λmax = 497 nm. The current-voltage-luminance (I-V-L) characteristics of the polymers show turn-on voltages of 4.0 V approximately. Two fluoro groups were introduced on every vinylene units of m-SiP-PPV to give m-SiP-PPDFV in an attempt to increase the electron affinity of the parent polymer, and the devices show an increased color stability even with vinylene units. The color stability is attributed to the electron-withdrawing effect of the fluoro groups, which protect vinylene units from oxidation in PPV derivatives. We believe that fluoro groups can be introduced in vinylene units in order to attain excellent stability of PPV derivatives.

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