Alkoxy-substituted poly(spirobifluorene)s and their copolymers with a triphenylamine derivative have been synthesized by Ni(0)-mediated polymerization. The polymers were well soluble in common organic solvents. Pure blue-light emissions without the long wavelength emission of poly(fluorene)s have be...
Alkoxy-substituted poly(spirobifluorene)s and their copolymers with a triphenylamine derivative have been synthesized by Ni(0)-mediated polymerization. The polymers were well soluble in common organic solvents. Pure blue-light emissions without the long wavelength emission of poly(fluorene)s have been observed in the fluorescence spectra of polymer thin films. The light emitting diodes with a device configuration of ITO/PEDT:PSS(30 nm)/polymer(60 nm)/LiF(1 nm)/Al(100 nm) have been fabricated. The electroluminescence spectra showed the blue emissions without the long wavelength emission as observed in the fluorescence spectra. The relatively poor electroluminescence quantum yield of the homopolymer (0.017% @ 20 $mA/cm^{2}$) with color coordinates of (0.16, 0.07) has been improved by the introduction of triphenylamine moiety, and the copolymer with derivative exhibited an electroluminescence quantum yield of 0.15 % at 20 $mA/cm^{2}$ with color coordinates of (0.16, 0.08). Moreover, the introduction of polar side chains to the spirobifluorene moiety enhanced the device performance and led to the quantum yields of 0.6 to 0.7 % at 20 $mA/cm^{2}$, although there was some expense of color purities.
Alkoxy-substituted poly(spirobifluorene)s and their copolymers with a triphenylamine derivative have been synthesized by Ni(0)-mediated polymerization. The polymers were well soluble in common organic solvents. Pure blue-light emissions without the long wavelength emission of poly(fluorene)s have been observed in the fluorescence spectra of polymer thin films. The light emitting diodes with a device configuration of ITO/PEDT:PSS(30 nm)/polymer(60 nm)/LiF(1 nm)/Al(100 nm) have been fabricated. The electroluminescence spectra showed the blue emissions without the long wavelength emission as observed in the fluorescence spectra. The relatively poor electroluminescence quantum yield of the homopolymer (0.017% @ 20 $mA/cm^{2}$) with color coordinates of (0.16, 0.07) has been improved by the introduction of triphenylamine moiety, and the copolymer with derivative exhibited an electroluminescence quantum yield of 0.15 % at 20 $mA/cm^{2}$ with color coordinates of (0.16, 0.08). Moreover, the introduction of polar side chains to the spirobifluorene moiety enhanced the device performance and led to the quantum yields of 0.6 to 0.7 % at 20 $mA/cm^{2}$, although there was some expense of color purities.
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대상 데이터
A polymer light-emitting device was fabricated using the spin coating method and vacuum deposition of the metal electrode. The SF8 device showed a similar spectrum as the PL spectrum, which is also a typical EL spectrum of a blue-lightemitting polyfluorene; the EL maximum was 427 nm. Usually, the EL device of polyfluorene shows a broad additional band between 500 and 600 nm due to the long wavelength emission.
A polymer device was fabricated using the spin coating method and a vacuum deposition of the metal electrode. The device structure was ITO/PEDT:PSS(30 nm)/polymer(60 nm)/ LiF(1 nm)/Al(100 nm). The PEDT:PSS (Baytron AI 4083) was purchased from Bayer and used as a hole injection layer.
Electroluminescence spectra of (a) SF8 and SF8TPA devices and (b) SF7O2 and SF7O2TPA devices. The device configuration was ITO/PEDT:PSS (30 nm)/polymer (60 nm)/ LiF (1 nm)/Al (100 nm).
데이터처리
UV-visible spectra were measured using a Hitachi UV3501, and photoluminescence spectra were measured using a Spex Fluorolog-3 Spectrofluorometer at room temperature. Cyclic voltammetry measurement was performed on an AUTOLAB/PGSTAT12.
참고문헌 (12)
Friend, R. H., Gymer, R. W., Holmes, A. B., Burroughes, J. H., Marks, R. N., Taliani, C., Bradley, D. D. C., Santos, D. A. Dos, Brédas, J. L., Lögdlund, M., Salaneck, W. R..
Electroluminescence in conjugated polymers.
Nature,
vol.397,
no.6715,
121-128.
Kreyenschmidt, M., Klaerner, G., Fuhrer, T., Ashenhurst, J., Karg, S., Chen, W. D., Lee, V. Y., Scott, J. C., Miller, R. D..
Thermally Stable Blue-Light-Emitting Copolymers of Poly(alkylfluorene).
Macromolecules,
vol.31,
no.4,
1099-1103.
Pei, Q., Yang, Y..
Efficient Photoluminescence and Electroluminescence from a Soluble Polyfluorene.
Journal of the American Chemical Society,
vol.118,
no.31,
7416-7417.
Wu, C. C., Lin, Y. T., Chiang, H. H., Cho, T. Y., Chen, C. W., Wong, K. T., Liao, Y. L., Lee, G. H., Peng, S. M..
Highly bright blue organic light-emitting devices using spirobifluorene-cored conjugated compounds.
Applied physics letters,
vol.81,
no.4,
577-579.
Vak, Doojin, Chun, Chaemin, Lee, Chang Lyoul, Kim, Jang-Joo, Kim, Dong-Yu.
A novel spiro-functionalized polyfluorene derivative with solubilizing side chains.
Journal of materials chemistry,
vol.14,
no.8,
1342-1346.
Lee, J.-I., Klaerner, G., Miller, R. D..
Oxidative Stability and Its Effect on the Photoluminescence of Poly(Fluorene) Derivatives: End Group Effects.
Chemistry of materials : a publication of the American Chemical Society,
vol.11,
no.4,
1083-1088.
Deng, X. Y., Lau, W. M., Wong, K. Y., Low, K. H., Chow, H. F., Cao, Y..
High efficiency low operating voltage polymer light-emitting diodes with aluminum cathode.
Applied physics letters,
vol.84,
no.18,
3522-3524.
Yang, Pei, Qibing.
Efficient blue-green and white light-emitting electrochemical cells based on poly[9,9-bis(3,6-dioxaheptyl)-fluorene-2,7-diyl].
Journal of applied physics,
vol.81,
no.7,
3294-3298.
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