A yellow carbon dots-based phosphor with high efficiency for white light-emitting devices
A yellow carbon dots-based phosphor with high efficiency for white light-emitting devices
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DOI：
10.1016/j.jlumin.2018.10.056
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发表时间：
2019-02-01
影响因子：
3.6
通讯作者：
Li, Huili
中科院分区：
文献类型：
--
作者：
Cao, Mengmeng;Xia, Chao;Li, Huili
以邻苯二胺(o-Pd)为原料，采用简单的一步水热法制备了黄色发光碳点(Cd)。用去离子水代替乙醇为反应溶剂，提高反应温度20℃，使硫化镉的发射峰从563 nm移动到563 nm，相应的发光量子产率从10.4%提高到23.1%。通过氢键和物理吸附将硫化镉有效、均匀地结合在淀粉颗粒上，得到了一种新型的环保型黄色硫化镉荧光粉。小颗粒Cd在大颗粒淀粉表面的有效分散可以延长Cd之间的距离，从而稳定地阻碍Cd的非辐射衰减过程和光致发光猝灭。获得了PLQY为66.9%的高效固体硫化镉荧光粉。结合良好的热稳定性和光稳定性，研制了基于单色转换的日光白光发光二极管，其CRI值为83，发光效率为30.54lm/W，CIE坐标为(0.3429，0.2817)。这表明所制备的硫化镉基发光体在发光材料方面具有很大的潜力。
The yellow-emitting carbon dots (CDs) were successfully synthesized by a simple one-step hydrothermal route using o-phenylenediamine (o-PD) as the starting material. The emssion peak of CDs shifted from 535 to 563 nm and the corresponding photoluminescence quantum yield (PLQY) enhanced from 10.4% to 23.1% when the reaction solvent of ethanol was replaced by deionized water and reaction temperature was increased by 20 degrees C. After CDs were effectively and uniformly attached to starch particles by hydrogen bonding and physical adsorption, a new type of environmentally friendly and yellow CDs-based phosphors has been developed. Effective dispersion of small CDs on the surface of large starch particles can lengthen the distance among CDs, as a result, the non-radiative decay process and photoluminescence quenching were steadily hindered. Highly efficient solid-state CDs phosphors with a PLQY of 66.9% were acquired. Combing with the excellent thermal stability and photostability, a daylight white LED based on a single color converter of yellow CDs phosphors was fabricated with a CRI of 83, luminous efficiency of 30.54 lm/W, and CIE coordinates of (0.3429, 0.2817). Suggesting that as-prepared CDs-based phosphors have a great potential in phosphor-based light-emitting devices.