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Sunlike White Light-Emitting Diodes Based on Rare-Earth-Free Luminescent Materials
| Content Provider | MDPI |
|---|---|
| Author | Amador, Menéndez-Velázquez Ana, Belén García-Delgado Morales, Dolores |
| Copyright Year | 2022 |
| Description | 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 $R_{9}$ 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 $R_{9}$ 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 $R_{9}$. |
| Starting Page | 1680 |
| e-ISSN | 19961944 |
| DOI | 10.3390/ma15051680 |
| Journal | Materials |
| Issue Number | 5 |
| Volume Number | 15 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-02-23 |
| Access Restriction | Open |
| Subject Keyword | Materials Solid-state Lighting (ssl) White Light-emitting Diode (wled) Color Rendering Index (cri) Rare-earth-free Luminescent Materials Luminescent Organic Materials Spectral Converters |
| Content Type | Text |
| Resource Type | Article |
