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

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


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
Issue number9
Publication statusPublished - 2010 May 1


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

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry


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