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학술지 Synthesis, Characterization, and Electroluminescence of Polyfluorene Copolymers with Phenothiazine Derivative; Their Applications to High-Efficiency Red and White PLEDs
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박무진, 이종희, 정인환, 박종화, 황도훈, 심홍구
Macromolecules, v.41 no.24, pp.9643-9649
American Chemical Society(ACS)
08IB3200, 고효율 백색 OLED 소자 기술 개발, 추혜용
We have synthesized new light-emitting copolymers by introducing the phenothiazine derivative, 4,7-bis(6-bromo-3-thiophenyl-10-n-butylphenothiazine)- 2,l,3-benzothiadiazole (BPTR), into the main chain of a homopolymer based on 2,7-dibromo-9,9-bis(4-octyloxy-phenyl) fluorene (BOPF). The polymers, designated as poly {9,9-bis-(4-octyloxyphenyl)-fluorene-2,7-diyl-co-4,7-bis(3-thiophenyl- 10-n-butylphenofhiazine-6-yl)-2,1,3-benzo-thiadiazole} (PFPTRs) were synthesized through palladium-catalyzed Suzuki coupling reactions and were found to be thermally stable and readily soluble in common organic solvents. The photoluminescence (PL) emission spectra of the copolymers were highly red-shifted as the fraction of BPTR units in the copolymer was increased. Light-emitting devices were fabricated using the ITO/PEDOT:PSS/polymer/Balq/LiF/ Al configuration with the PFPTR polymers as the emitting layer. The electroluminescence (EL) device based on PFPTR 1 showed nearly pure red emission [CIE coordinate values (x, y), (0.62, 0.36)] that was very close to the standard red (0.66, 0.34) demanded by the National Television System Committee. Furthermore, its maximum external quantum efficiency and maximum current efficiency were 2.3% and 1.70 cd/A at 10 V, respectively. Our device results for PFPTR 1 are among the highest values yet reported for saturated red polymer emitters. Moreover, the EL emissions of PFPTR 01 and PFPTR 025 afforded white electroluminescence with CIE coordinates of (0.27, 0.40) and (0.41, 0.37) respectively, which appeared to be near-white to the naked eye. © 2008 American Chemical Society.
KSP 제안 키워드
3-benzothiadiazole, CIE coordinates, Carbon monoxide(CO), External Quantum Efficiency, Main chain, Maximum current, Naked eye, Palladium-catalyzed, Photoluminescence (PL) emission, Polyfluorene copolymers, Saturated red