Electronic Resource
Electroluminescence of Multicomponent Conjugated Polymers. 1. Roles of Polymer/Polymer Interfaces in Emission Enhancement and Voltage-Tunable Multicolor Emission in Semiconducting Polymer/Polymer Heterojunctions
| العنوان: | Electroluminescence of Multicomponent Conjugated Polymers. 1. Roles of Polymer/Polymer Interfaces in Emission Enhancement and Voltage-Tunable Multicolor Emission in Semiconducting Polymer/Polymer Heterojunctions |
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| المؤلفون: | ROCHESTER UNIV NY DEPT OF CHEMICAL ENGINEERING, Zhang, Xuejun, Jenekhe, Samson A. |
| المصدر: | DTIC AND NTIS |
| بيانات النشر: | 1999-08-16 |
| نوع الوثيقة: | Electronic Resource |
| مستخلص: | Effects of the electronic structure of polymer/polymer interfaces on the electroluminescence efficiency and tunable multicolor emission of polymer heterojunction light-emitting diodes were explored by a series of 16 n-type conjugated polymers with varying electron affinities and ionization potentials in conjunction with poly(p-phenylene vinylene). Efficiency and luminance of diodes of the type indium-tin-oxide/poly(p-phenylene vinylene)/n-type polymer/aluminum were maximized and were as high as 3% photons/electron and 820 cd/sq m, respectively, when the energetics at the polymer/polymer interface favored electron transfer while disfavoring hole transfer. Energetic harrier to electron transfer at the polymer/polymer interface was more important to electroluminescence efficiency and diode luminance than injection barrier at the cathode/polymer interface. By a judicious choice of the relative layer thicknesses and the components of the bilayer heterojunctions, the rate of both electron and hole transfer across the polymer/polymer interface can be regulated by the applied voltage, resulting in continuous voltage tunability of emission colors. The voltage tunable multicolor emission is exemplified by red (5 V) left & right arrow yellow (9 V) left & right arrow green (12 V) and other intermediate color switching in poly(p-phenylene vinylene)/poly(2,6-(4-phenyl)quinoline) (PPQ) diodes. The multicolors obtained from a single heterojunction diode by varying the applied voltage originated from the mixing of the component emission spectra in varying proportions facilitated by interfacial charge transfer and finite size effects. Electroluminescence microscopy was used to directly image the multicolor diodes. Submitted for publication in J. Am. Chem. Soc. |
| مصطلحات الفهرس: | Polymer Chemistry, Electrooptical and Optoelectronic Devices, ELECTROLUMINESCENCE, HETEROJUNCTIONS, CONJUGATED POLYMERS, INTERFACES, THIN FILMS, EMISSION SPECTRA, HOLES(ELECTRON DEFICIENCIES), ELECTRONS, CATHODES, LASER APPLICATIONS, OXIDES, ALUMINUM, COLORS, ORGANIC COMPOUNDS, CHARGE TRANSFER, PHOTONS, MOLECULAR STRUCTURE, N TYPE SEMICONDUCTORS, ELECTRON TRANSFER, ENERGETIC PROPERTIES, INDIUM, PHOTOVOLTAIC EFFECT, LUMINANCE, LIGHT EMITTING DIODES, QUINOLINES, IONIZATION POTENTIALS., POLY-P-PHENYLENE VINYLENE, PPQ, POLY-P-PHENYLENE VINYLENE-POLY-2, 6-4-PHENYL-QUINOLINE, ELECTRON AFFINITIES, TUNABLE MULTICOLOR EMISSION, INDIUM TIN OXIDE, POLYMER/POLYMER INTERFACES, FINITE SIZE EFFECTS, BILAYER HETEROJUNCTIONS, N TYPE CONJUGATED POLYMERS, OPTOELECTRONIC DEVICES, Text |
| URL: | |
| الاتاحة: | Open access content. Open access content APPROVED FOR PUBLIC RELEASE |
| ملاحظة: | text/html English |
| Other Numbers: | DTICE ADA367001 831690131 |
| المصدر المساهم: | From OAIster®, provided by the OCLC Cooperative. |
| رقم الانضمام: | edsoai.ocn831690131 |
| قاعدة البيانات: | OAIster |
| الوصف غير متاح. |