کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1264466 | 1496843 | 2007 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Intrachain confinement of excitons and radiative recombination in polyaniline grains
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Suppression of the benzenoid-to-quinoid excitonic transition (BQET) and enhancement of the quantum yield of photoluminescence (PL) at â¼390Â nm has been observed in grained films of the emeraldine base (EB) of polyaniline. The major PL band from the EB films with the grained morphology was relatively narrow, with FWHM of about 1020Â cmâ1, followed by vibronic overtones the intensity of which was dependent on the mode of the PL excitation. The change of the film morphology, where instead of grains large aggregates were formed, leaded to the recovery of the absorption band corresponding to the BQET and quenching of the emission, respectively. It is suggested that the origin of PL in EB films is due to the distorted polymer chains in EB grains where the ring torsion angle of benzenoid group in respect to the adjacent quinoid group increases, thus resulting in the suppressed BQET and enhanced emission.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Organic Electronics - Volume 8, Issues 2â3, AprilâJune 2007, Pages 286-291
Journal: Organic Electronics - Volume 8, Issues 2â3, AprilâJune 2007, Pages 286-291
نویسندگان
O.P. Dimitriev, V.V. Kislyuk, P.S. Smertenko,