Naturally Derived Organic Dyes for LED Lightings of High Color Rendering and Fidelity Index
Naturally Derived Organic Dyes for LED Lightings of High Color Rendering and Fidelity Index
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DOI：
10.1002/adsu.202000300
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发表时间：
2021-06-09
影响因子：
7.1
通讯作者：
Luscombe, Christine K.
中科院分区：
文献类型：
--
作者：
Huang, Yunping;Cohen, Theodore A.;Luscombe, Christine K.
发光二极管(LED)是一种市场前景广阔的照明技术。通常，LED背光源通常与稀土元素(REE)制成的无机荧光粉配对，以调整不同应用的发射线形状。然而，稀土生产是一个资源密集型过程，对环境有许多负面影响。在这里，有机混合发光二极管是使用从丰富和无毒的天然产物(可可碱)合成的有机染料来取代稀土荧光粉而开发的。由此产生的混合LED从400-740 nm产生连续发射，导致高显色指数(当前行业标准)为90，色彩保真度指数(最先进和最全面的标准)为92，对基于稀土荧光粉的商用LED构成了挑战。此外，光转换复合材料由99wt%SBS(一种廉价的工业聚合物)和1wt%可可碱染料制成，将1W LED的光转换器成本降低到(SIC)1.30，而商业产品的成本约为(SIC)19.2。染料-SBS复合材料的光转换效率为82%。激发态动力学实验也为进一步提高可可碱染料的光转换效率提供了指导，同时保持了良好的显色性和保真度。
Light-emitting diodes (LEDs) are a lighting technology with a huge and ascending market. Typically, LED backlights are often paired with inorganic phosphors made from rare-earth elements (REEs) to tune the emission lineshapes for different applications. However, REE production is a resource-intensive process with many negative environmental impacts. Herein organic hybrid LEDs are developed using organic dyes synthesized from an abundant and non-toxic natural product (theobromine) to replace REE phosphors. The resulted hybrid LED generates continuous emission from 400-740 nm, resulting in a high color rendering index (the current industry standard) of 90 and a color fidelity index (the most advanced and comprehensive standard) of 92, challenging commercial LEDs based on REE phosphors. In addition, the light-converting composite is made from 99 wt% SBS, an inexpensive industrial polymer, and 1 wt% theobromine dyes, reducing the cost of the light converter to (sic)1.30 for a 1 W LED, compared to approximately (sic) 19.2 of commercial products. The light converting efficiency of the dye-SBS composite is 82%. Excited state kinetics experiments are also conducted to provide guidance to further increase the light-converting efficiency of the theobromine dyes while maintaining excellent color rendering and fidelity.