Device Physics of White Polymer Light-Emitting Diodes
| Autor: | Paul W. M. Blom, AJ Hof, Herman T. Nicolai |
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| Přispěvatelé: | Zernike Institute for Advanced Materials |
| Rok vydání: | 2012 |
| Předmět: |
Materials science
GREEN RECOMBINATION Electroluminescence BLENDS law.invention Biomaterials Polyfluorene chemistry.chemical_compound BLUE law conjugated polymers ELECTROLUMINESCENCE Electrochemistry OLED COLOR Diode business.industry fungi POLYFLUORENE organic light-emitting diodes Condensed Matter Physics Penning trap Electron transport chain charge transport Electronic Optical and Magnetic Materials chemistry Atomic electron transition Optoelectronics EMISSION business SYSTEM Light-emitting diode |
| Zdroj: | Advanced Functional Materials, 22(10), 2040-2047. WILEY-V C H VERLAG GMBH |
| ISSN: | 1616-301X |
| DOI: | 10.1002/adfm.201102699 |
| Popis: | The charge transport and recombination in white-emitting polymer light- emitting diodes (PLEDs) are studied. The PLED investigated has a single emissive layer consisting of a copolymer in which a green and red dye are incorporated in a blue backbone. From single-carrier devices the effect of the green- and red-emitting dyes on the hole and electron transport is determined. The red dye acts as a deep electron trap thereby strongly reducing the electron transport. By incorporating trap-assisted recombination for the red emission and bimolecular Langevin recombination for the blue emission, the current and light output of the white PLED can be consistently described. The color shift of single-layer white-emitting PLEDs can be explained by the different voltage dependencies of trap-assisted and bimolecular recombination. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. |
| Databáze: | OpenAIRE |
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