Highly Efficient Orange Emissive Graphene Quantum Dots Prepared by Acid-Free Method for White LEDs
Highly Efficient Orange Emissive Graphene Quantum Dots Prepared by Acid-Free Method for White LEDs
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DOI：
10.1021/acssuschemeng.0c00106
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发表时间：
2020-05-04
影响因子：
8.4
通讯作者：
Han, Jiecai
中科院分区：
文献类型：
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作者：
Chen, You-Xiao;Lu, Dong;Han, Jiecai
石墨烯量子点（GQDs）具有禁带宽度可调、化学稳定性和光学稳定性好、生物相容性好等特点，在光电子领域有着广阔的应用前景。在这项工作中，我们提供了一个方便的建议，以获得均匀的蓝绿色发光的GQD和改性的高效橙色发光的石墨烯量子点（D-GQD）的富勒烯（C-60）衍生的无酸条件下。所制备的D-GQDs表现出显著的转换效率，其量子产率高达52.4%，发射峰为617 nm。此外，GQD和D-GQD与聚乙烯醇（PVA）共混制备透明的光致发光薄膜，其显示出优异的柔韧性和较好的白色发射性能，满足商业白色LED的要求。
Graphene quantum dots (GQDs) have wide prospective applications for optoelectronic fields owing to their unique characteristics, such as tunable bandgaps, high chemical and optical stability, as well as good biocompatibility. In this work, we offered a convenient proposal to obtain uniform blue-green emissive GQDs and modified efficient orange-emitting graphene quantum dots (D-GQDs) derived from fullerene (C-60) under acid-free conditions. The as-prepared D-GQDs demonstrate remarkable conversion efficiency, for which the quantum yield is up to 52.4% with an emission peak of 617 nm. Also, GQDs and D-GQDs were blended with poly(vinyl alcohol) (PVA) to prepare transparent photoluminescent films, which show excellent flexibility and preferable white emission property meeting the requirements of commercial white LEDs.