An electroluminescence device for printable electronics using coprecipitated ZnS:Mn nanocrystal ink.
Electroluminescence (EL) devices for printable electronics using coprecipitated ZnS:Mn nanocrystal (NC) ink are demonstrated. The EL properties of these devices were investigated along with the structural and optical properties of ZnS:Mn NCs with an emphasis on their dependence on crystal size. Transmission electron microscopy and x-ray diffraction studies revealed that the NCs, with a crystal size of 3-4 nm, are nearly monodisperse; the crystal size can be controlled by the Zn(2+) concentration in the starting solution for coprecipitation. The results of optical studies indicate the presence of quantum confinement effects; in addition, the NC surfaces are well passivated, regardless of the crystal size. Finally, an increase in the luminance of EL devices with a decrease in crystal size is observed, which suggests the excitation mechanism of ZnS:Mn NC EL devices.
Department of Systems Innovation, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan. toyama@ee.es.osaka-u.ac.jp
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T
Toyama
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T
Hama
D
D
Adachi
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Nakashizu
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H
Okamoto
D003460:Crystallization / Q000379:methods; D004581:Electronics / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005590:Fractional Precipitation; D007281:Ink; D008163:Luminescent Measurements / Q000295:instrumentation*; D008345:Manganese / Q000737:chemistry*; D008422:Materials Testing; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology / Q000295:instrumentation; D010316:Particle Size; D011327:Printing / Q000295:instrumentation*; D018036:Selenium Compounds / Q000737:chemistry*; D017967:Zinc Compounds / Q000737:chemistry*
D018036:Selenium Compounds; D017967:Zinc Compounds; D008345:Manganese; C044696:zinc selenide