电致发光
光致发光
量子点
材料科学
石墨烯
光电子学
掺杂剂
显色指数
石墨
发光二极管
二极管
纳米技术
兴奋剂
复合材料
图层(电子)
作者
Woosung Kwon,Young‐Hoon Kim,Chang‐Lyoul Lee,Min-Kyung Lee,Hee Cheul Choi,Tae‐Woo Lee,Shi Woo Rhee
出处
期刊:Nano Letters
[American Chemical Society]
日期:2014-02-04
卷期号:14 (3): 1306-1311
被引量:270
摘要
Size-controlled graphene quantum dots (GQDs) are prepared via amidative cutting of tattered graphite. The power of this method is that the size of the GQDs could be varied from 2 to over 10 nm by simply regulating the amine concentration. The energy gaps in such GQDs are narrowed down with increasing their size, showing colorful photoluminescence from blue to brown. We also reveal the roles of defect sites in photoluminescence, developing long-wavelength emission and reducing exciton lifetime. To assess the viability of the present method, organic light-emitting diodes employing our GQDs as a dopant are first demonstrated with the thorough studies in their energy levels. This is to our best knowledge the first meaningful report on the electroluminescence of GQDs, successfully rendering white light with the external quantum efficiency of ca. 0.1%.
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