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 language | English |
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Pages (from-to) | 1913-1918 |
Number of pages | 6 |
Journal | Journal of Polymer Science, Part A: Polymer Chemistry |
Volume | 48 |
Issue number | 9 |
DOIs | |
Publication status | Published - 2010 May 1 |
Keywords
- Biopolymers
- Carbazole
- Electrophosphorescence
- Iridium complex
- Light-emitting diodes (lfd)
- Luminescence
- Photoluminescence
ASJC Scopus subject areas
- Polymers and Plastics
- Organic Chemistry
- Materials Chemistry