Microwave-Assisted Heating Method toward Multicolor Quantum Dot-Based Phosphors with Much Improved Luminescence
Microwave-Assisted Heating Method toward Multicolor Quantum Dot-Based Phosphors with Much Improved Luminescence
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微波辅助加热方法可显着改善发光性能的多色量子点荧光粉
DOI：
10.1021/acsami.8b06323
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发表时间：
2018
影响因子：
9.5
通讯作者：
Zhang Hao
中科院分区：
文献类型：
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作者：
Zhou Ding;Wang Yi;Tian Pengfei;Jing Pengtao;Sun Maolei;Chen Xi;Xu Xiaowei;Li Di;Mei Shiliang;Liu Xiaoyan;Zhang Wanlu;Guo Ruiqian;Qu Songnan;Zhang Hao
由于人们对白光器件的需求不断增加，基于固态高光致发光量子点（QD）的荧光粉作为颜色转换器引起了极大的科学兴趣。本文提出了一种微波辅助加热方法，通过微波辅助加热量子点与水玻璃水溶液的混合物，在30 s内制备出多色量子点基荧光粉。在复合材料中，形成的交联网络不仅可以作为基体防止量子点在固态中聚集，还可以引起量子点周围折射率的变化和量子点表面的优化，从而使复合材料具有良好的稳定性，并且光致发光量子产率（69%）比初始的量子点水溶液（33%）提高了两倍。利用基于量子点的荧光粉作为颜色转换层，实现了色温可控、色纯度高、显色指数高（90.3）的白色发光二极管，在显示和照明方面显示出巨大的潜力。此外，基于量子点的荧光粉的发光寿命小于25 ns。此外，还展示了基于量子点的荧光粉在可见光通信中的潜在应用，其调制带宽可达到42 MHz。
Solid-state highly photoluminescent quantum dot (QD)-based phosphors attract great scientific interests as color converters because of an increasing demand for white-light-emitting devices. Herein, a microwave-assisted heating method is presented to fabricate multicolor QD-based phosphors within 30 s through microwave-assisted heating of the mixture of QDs and sodium silicate aqueous solution. In the composites, the formed cross-linked networks not only play as a matrix to prevent QD aggregation in solid state but also cause the variation of the refractive index around QDs and the QD surface optimization, which contributes to good stabilities and twice enhancement in photoluminescence quantum yields (69%) compared with the initial QD aqueous solution (33%). Using the QD-based phosphors as color conversion layers, white-light-emitting diodes were realized with controllable color temperature, high color purity, and high color-rendering index (90.3), which show a great potential in display and illumination. Furthermore, the luminescence lifetime of the QD-based phosphors is less than 25 ns. The potential application of the QD-based phosphors in visible light communication was also demonstrated, with the modulation bandwidth achieving 42 MHz.