通过流延技术为暖色WLED构建全色发光N基碳纳米点及其高效固态材料,Chemical Engineering Journal

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通过流延技术为暖色WLED构建全色发光N基碳纳米点及其高效固态材料
Chemical Engineering Journal ( IF 13.3 ) Pub Date : 2017-05-16 03:09:31
Sai Lin, Mengyuan Chen, Ziwei Wang, Yijun Zhang, Rongrong Yuan, Xiaojuan Liang, Weidong Xiang, Yongqiang Zhou

如今，多色发光碳点（Cdots）极为重要，但仍然对构造全色发光Cdots及其高效固态材料构成挑战。在这里，我们制造了一种通过调节反应温度来合成多色Cdot的简便方法。尽管所有样品均显示出均匀的粒径分布和相似的石墨结构，但碳点之间的表面化学成分逐渐变化，尤其是氧含量和氮含量。详细的材料表征表明，这种可调发射是化学成分变化引起的。据信在高温下表面氧化变得更严重，导致形成较高的氧和氮，这是长波长发射的原因。同时，通过有机硅烷（OSi）和Cdots的组合成功创建了柔性固态材料，可用于防止聚集诱导的固态荧光猝灭。最后，红色的Cdots / OSi堆叠在Y轴上₃ Al ₅ O ₁₂：Ce ³⁺（Ce ³⁺：YAG）通过流延铸造技术制成的玻璃中荧光粉（Ce-PiG）。然后，由这些材料和GaN芯片构成了暖白色发光二极管（WLED）。随着Cdots的增加，相关色温（CCT）降低，而显色指数（CRI）升高，并且色坐标移向红色区域。所得的颜色转换材料通过调节红色Cdots的含量产生了暖白色，这将成为暖WLED中应用的有希望的候选者。

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Construction of full-color light-emitting N-based carbon nanodots and their efficient solid-state materials via tape-casting technology for warm WLED

Multicolor luminescent carbon dots (Cdots) are of immense importance nowadays, while it still a challenge to construction of full-color light-emitting Cdots and their efficient solid-state materials. Here in, we fabricated a facile method to synthesize multicolor Cdots by adjustment of the reaction temperature. Although all samples showed uniform distribution of particles size and similar graphite structure, the surface chemical composition gradually varied among Cdots, especially the oxygen contents and nitrogen contents. Detailed material characterization has revealed that this tunable emission is results from the changes of the chemical composition. It is believed that the surface oxidation become more severe at high temperature, resulting in the formation of higher oxygen and nitrogen, which are responsible for the long-wavelength emission. Meanwhile, flexible solid-state materials were successfully created by combination of organosilane (OSi) and Cdots, which can be used to prevent the aggregation-induced solid-state fluorescence quenching. Finally, red Cdots/OSi was stacked on the Y₃Al₅O₁₂:Ce³⁺ (Ce³⁺: YAG) phosphor-in-glass (Ce-PiG) via tape-casting technology. Then, warm white light-emitting diodes (WLEDs) were constructed by these materials and GaN chips. As the Cdots increases, the correlated color temperature (CCT) decreases while the color rendering index (CRI) increases, and the color coordinates shift towards the red region. The resulting color converting material produced a warm white by adjusting red Cdots content, which will be a promising candidate for applications in the warm WLED.

更新日期：2017-05-16

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