One-pot synthesis of single-component graphene quantum dots for stable and bright white luminescence films as a phosphor
One-pot synthesis of single-component graphene quantum dots for stable and bright white luminescence films as a phosphor
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一锅法合成单组分石墨烯量子点作为荧光粉，获得稳定、明亮的白色发光薄膜
DOI：
10.1016/j.optmat.2022.112368
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发表时间：
2022-05
影响因子：
3.9
通讯作者：
Gui-Ping Dai
中科院分区：
文献类型：
--
作者：
Zhi Liu;Long Tan;Pei-Pei Hou;Xin-Jian Jin;Meng-Chao Li;Qun-Yi Zhou;Peng Liao;Zheling Zeng;Shuguang Deng;Gui-Ping Dai
石墨烯量子点具有成本低、无毒、光学性质独特等优点，在各个领域受到广泛关注。然而，合成具有高光致发光量子产率（PLQY）的单组分白光发光GQD仍然具有挑战性。在本工作中，巧妙地引入了1，5-二氨基萘（1，5-DAN）和酒石酸（TA）作为溶剂热反应的前体。结果表明，所制备的量子点在413 nm处呈现出蓝色发光峰（表面态发光），在558 nm处呈现出黄绿色发光峰（核态发光），这可能分别源于量子点表面的各种官能团和量子点内部的π共轭结构，从而使量子点能够发出白色光.结果表明，1，5-DAN和TA分别通过提供苯环和C/C双键O键的组分，对黄绿色发光带的形成起着至关重要的作用.此外，平均粒径约为2.7 nm的白光发光GQDs（W-GQDs）在365 nm紫外光和日光下显示出高达28.68%的PLQY和良好的光稳定性。在固体GQD/聚乙烯醇膜中仍然可以实现高达9.32%的PLQY。因此，我们所制备的量子点是有希望的白色发光二极管的应用。
Graphene quantum dots (GQDs) with the merits of low cost, non-toxicity and unique optical properties have attracted much attention in various fields. However, it is still challenging to synthesize one-component white-light emissive GQDs with high photoluminescence quantum yield (PLQY). In this work, 1,5-diaminonaphthalene (1,5-DAN) and tartaric acid (TA) were smartly introduced as the precursors in a solvothermal reaction. As a matter of fact, the obtained GQDs exhibited a blue-emission band centered at 413 nm (surface state emission) and a yellow-green-emission band at 558 nm (core-state emission) might be originated from various surface functional groups and inner π-conjugated structure, respectively, which enabled white luminescence of the GQDs. It reveals that both of 1,5-DAN and TA played a vital role on forming the yellow-green-emission band by providing the components of benzene rings and Cdouble bondC/Cdouble bondO bonds, respectively. Moreover, the white-light emissive GQDs (W-GQDs) with the mean size of ∼2.7 nm exhibited a PLQY as high as 28.68% and good photostability under the 365 nm UV light and daylight. A PLQY up to 9.32% can still be achieved in the solid GQDs/polyvinyl alcohol film. Therefore, our prepared GQDs are promising for white light emitting diodes application.
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