Menéndez-Velázquez Amador, Morales Dolores, García-Delgado Ana Belén
Photoactive Materials Research Unit, IDONIAL Technology Center, 33417 Avilés, Spain.
Materials (Basel). 2022 Feb 23;15(5):1680. doi: 10.3390/ma15051680.
Solid-state lighting (SSL) sources based on light-emitting diodes represent the new generation of highly efficient illumination systems that significantly impact energy-saving. The development of white light-emitting diodes (WLEDs) with a combination of high color rendering index (CRI) and high deep-red color rendering R is an important challenge in the field of solid-state lighting. On the other hand, most WLEDs use rare-earth inorganic luminescent materials. The annual demand for rare-earth metals has doubled to 125,000 tons in 15 years, and the demand is projected to reach 315,000 tons in 2030. The explosion in demand for these materials, combined with a monopolistic supply source, represents a real risk for the development of WLEDs in the next few years. Luminescent organic materials are a relevant and promising alternative. Here, we report a WLED with a very high CRI of 95.7 and R of 78.7, obtained using a combination of a blue LED chip (excitation source) and two organic luminescent dyes (Coumarin 6 and Lumogen Red) acting as spectral converters in a multilayer remote phosphor configuration. To the best of our knowledge, this is the first rare-earth-free WLED with such high values of CRI and R.
基于发光二极管的固态照明（SSL）光源代表了新一代高效照明系统，对节能有重大影响。开发兼具高显色指数（CRI）和高深红色显色指数R的白光发光二极管（WLED）是固态照明领域的一项重要挑战。另一方面，大多数WLED使用稀土无机发光材料。稀土金属的年需求量在15年内翻了一番，达到12.5万吨，预计到2030年将达到31.5万吨。这些材料需求的激增，再加上垄断性的供应源，对未来几年WLED的发展构成了实际风险。发光有机材料是一种相关且有前景的替代方案。在此，我们报告了一种CRI高达95.7、R为78.7的WLED，它是通过在多层远程荧光粉配置中结合蓝色LED芯片（激发源）和两种用作光谱转换器的有机发光染料（香豆素6和鲁米诺红）获得的。据我们所知，这是首个具有如此高CRI和R值的无稀土WLED。
