Polymer light-emitting diodes based on poly(3-hexyl thiophene)
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Poly(3-hexyl thiophene)(P3HT) and poly(3-dodecyl thiophene)(P3DT) were polymerized by oxidative coupling with ferric chloride. The P3HT light-emitting device emitted red light and it could be observable in the ordinary indoor light. The device had the turn-on electric field of about 3×107 V/m. The maximum electroluminescene (EL) intensity was obtained when the thickness of polymer layer was about 130 nm in ITO/P3HT/Al device. The maximum external quantum yield was 0.002%. The maximum luminance was 21 cd/m2. The EL intensity decreases with increasing the crystallinity of the polymer layer. By using the oriented poly(3-alkyl thiophene)(PAT) layer as an electroluminescent layer in the ITO/polymer/Al light-emitting devices, the polarized EL light emission was observed. The EL intensity ratio of parallel to perpendicular direction to the stretch direction for P3HT was about 1.40.
KeywordsThiophene Polymer Layer Thiophene Ring Maximum Luminance Electroluminescence Spectrum
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