کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9812753 | 1518119 | 2005 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Opto-electronic emission of heterocyclic aromatic coil-like and rigid-rod polymer blends
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Poly-2,2â²-m-phenylene-5,5â²-bibenzimidazole (Pbi) with a partially conjugated coil-like backbone and poly-p-phenylenebenzobisthiazole (PBT) with a fully conjugated rigid-rod backbone are two heterocyclic aromatic polymers which were codissolved and made into freestanding films or spun onto an indium tin oxide (ITO) substrate. Ultraviolet-visible light absorption λmax for Pbi and PBT were 363 nm and 437 nm, respectively, and for the Pbi/PBT blends were a superposition of individual absorption indicating no intermolecular energy transfer. However, the photoluminescence of the blends excited at 363 nm demonstrated a red shift with increasing PBT content. This was attributed to a template effect of PBT rigid-rod backbone confining coil-like Pbi into an extended chain configuration leading to improved charge delocalization. Aluminum electrode was vacuum evaporated onto the polymer/ITO system for light emitting diodes. The diode threshold voltage varied from 4 V to 14 V with decreasing PBT content. Electroluminescence emission spectra of the blends seemed to be a combination of those of Pbi and PBT with emission λmax tunable for 60 nm.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thin Solid Films - Volume 479, Issues 1â2, 23 May 2005, Pages 245-248
Journal: Thin Solid Films - Volume 479, Issues 1â2, 23 May 2005, Pages 245-248
نویسندگان
Chien-Chang Wu, Chin-Feng Chang, Shih Jung Bai,