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Low cost stretchable thin film electroluminescent devices for display applications
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Orientador(es)
Resumo(s)
Recent advances in materials science research have enabled the production of highly
stretchable devices like sensors and displays. This new field of stretchable electronics
stem from strain engineering and nanocomposite approaches, which require expensive
production methods and result in fragile devices.
The emerging materials group at TU Delft Industrial Design Engineering Department
large interest on expandable and stretchable light emitting devices culminated
on this work where it was found a method to obtain stretchable electroluminescent devices for application on simple electroluminescent passive matrix displays. The devices were produced with all solution-based methods and non-expensive techniques as screen printing. The devices were obtained with by a sandwich structure of an emissive layer in between two electrodes. It was used as substrate a commercially available silicone rubber material called Ecoflex 00-30. The same silicone rubber material with ZnS:Cu phosphorescent powders embed were used as emissive layer. PEDOT:PSS enhanced with Bis(trifluoromethane)sulfonimide lithium salt was used as electrodes, samples with 10% enhancer show 800
at 0% strain and 2 k at 50% strain. Electroluminescent devices showed a transmittance of 30% limited by the fabrication technique and a satisfactory brightness in daylight. The entire structure has less than 250μm of thickness, encapsulated and with a substrate of 100μm. Relative luminance characterizations showed good luminance behaviour upon strain.
Descrição
Palavras-chave
PEDOT:PSS Electroluminescence Electroluminescent devices Passive Matrix Screen printing Stretchable