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  • AIP Publishing  (2)
  • Jin, Sung-Ho  (2)
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  • AIP Publishing  (2)
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  • 1
    Online Resource
    Online Resource
    Green phosphorescent light-emitting diodes from polymer doped with iridium complex
    AIP Publishing ; 2008
    In:  Applied Physics Letters Vol. 92, No. 19 ( 2008-05-12)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 92, No. 19 ( 2008-05-12)
    Abstract: We demonstrate efficient organic light-emitting diodes by using a phosphorescent host/guest system consisting of a recently developed green electrophosphorescent molecule, bis[(4,6-difluorophenyl)-8-methylpyridinato-N,C2′)iridium pyrazinate [(dfmppy)2Irprz], as the guest and a blend of poly(N-vinylcarbazole) (PVK) with 2-(4-biphenyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD) as the host and different cathode structures such as a triple layer of BAlq∕LiF∕Al and a bilayer of CsF∕Al. The electrophosphorescence emission was characteristic of (dfmppy)2Irprz, with its maximum at 563nm with Commission International de L’Eclairage coordinates of (0.43, 0.53). The device with 0.5wt% of (dfmppy)2Irprz in PVK/PBD (60:40wt%) with a CsF (2nm)∕Al bilayer exhibited an external quantum efficiency of 6.2%, luminescence efficiency of 17.3cd∕A, luminous power efficiency of 24.2lm∕W, and maximum brightness of 10220cd∕m2.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.2927357
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2008
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 2
    Online Resource
    Online Resource
    Third-order optical nonlinearity of conjugated poly(4,4-disubstituted-1,6-heptadiyne)s
    AIP Publishing ; 1994
    In:  Applied Physics Letters Vol. 65, No. 3 ( 1994-07-18), p. 289-291
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 65, No. 3 ( 1994-07-18), p. 289-291
    Abstract: Large third-order optical nonlinearity was found with the soluble conjugated polymers (substituted polyacetylenes) synthesized by the ring-forming metathesis polymerization of 4,4-disubstituted-1,6-heptadiynes. These polymers were of quite high molecular weight (∼105) and were highly soluble in common organic solvents. The linear optical property and the third-order optical nonlinearity of these polymers were investigated in terms of the chemical structure of the 4,4-disubstituents using the polymer films of around 100-nm thickness fabricated by the spin coating of tetrahydrofuran solutions. The π-π* transition of the conjugated π-electron main chain was characterized as the strong absorption peak at around 540 nm of the electronic spectra, where the optical density of the transition was found to be largely dependent on the molar volume of the substituents. The near-resonant values of the third-order nonlinear optical coefficient, χ(3)(−3ω;ω,ω,ω) were found to be 2.6 to 6.5×10−11 esu, which also were controlled by the molar volume of the substituent group.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.112349
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1994
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
    Location Call Number Limitation Availability
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