Organic soluble deoxyribonucleic acid (DNA) bearing carbazole moieties and its blend with phosphorescent Ir(III) complexes

Min J U Cho, U. R A Lee, Youn Sun Kim, Jicheol Shin, Young Min Kim, Young Wook Park, Byeong Kwon Ju, Jung I L Jin, Dong Hoon Choi

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12 Citations (Scopus)

Abstract

A functionalzed deoxyribonucleic acid (Cz-DNA) was prepared with carbazolyl ammonium lipid as a triplet host material for phosphorescent material system. It is soluble in organic solvents, which facilitates the sample preparation for the absorption and luminescent properties in solid states. A highly soluble iridium complex, Ir(Cz-PPy)3 with carbazoly!-substituted 2-phenylpyridine ligands was employed for studying the phosphorescence in Cz-DNA. There is a good overlap between the photoluminescence spectrum of Cz-DNA and the metal-to-ligand charge transfer (MLCT) absorption bands of the iridium complex. This overlap enables efficient energy transfer from the excited state in the host to the M LCT band of Ir(Cz-ppy)3. In addition, photoluminescence quantum yield of Cz-DNA was found to be rela-tively larger than the copolymer (PCzSt) with vinylcarbazole and styrene. Thus, Cz-DNA was employed as a triplet host material for fabricating multilayered electrophosphorescence devices via modification of its property by doping 5,4-iert-butylhexyl-1,3,4oxadiazole (PBD). After doping 30 wt % PBD and 10 wt % Ir(Czppy)3 into Cz-DNA, we achieved much improvement in electron injection/transport from an adjacent carrier transport layer, resulting in much improved device performances.

Original languageEnglish
Pages (from-to)1913-1918
Number of pages6
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume48
Issue number9
DOIs
Publication statusPublished - 2010 May 1

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Keywords

  • Biopolymers
  • Carbazole
  • Electrophosphorescence
  • Iridium complex
  • Light-emitting diodes (lfd)
  • Luminescence
  • Photoluminescence

ASJC Scopus subject areas

  • Materials Chemistry
  • Polymers and Plastics
  • Organic Chemistry

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