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Qiao, J., Zhang, S., Zhou, X., Chen, W., Gautier, R. & Xia, Z. (2022) Near-Infrared Light-Emitting Diodes utilizing a Europium-Activated Calcium Oxide Phosphor with External Quantum Efficiency of up to 54.7%. Advanced Materials, n/a 2201887.
Added by: Richard Baschera (2022-06-02 13:20:29) Last edited by: Richard Baschera (2022-06-02 13:25:31) |
| Type de référence: Article DOI: 10.1002/adma.202201887 Numéro d'identification (ISBN etc.): 1521-4095 Clé BibTeX: Qiao2022 Voir tous les détails bibliographiques  |
Catégories: INTERNATIONAL, MIOPS Mots-clés: light-emitting diodes, near-infrared luminescence, phosphors Créateurs: Chen, Gautier, Qiao, Xia, Zhang, Zhou Collection: Advanced Materials |
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| Liens URLs https://onlinelibr ... 002/adma.202201887 |
| Résumé |
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Near-infrared (NIR) luminescence materials with broadband emissions are necessary for the development of light-emitting diodes (LEDs) based light sources. However, most known NIR-emitting materials are limited by their low external quantum efficiency. This work demonstrates how the photoluminescence quantum efficiency of europium-activated calcium oxide (CaO:Eu) NIR phosphor can be significantly improved and stabilized at operating temperatures of LEDs. A carbon paper wrapping technology is innovatively developed and used during the solid-state sintering to promote the reduction of Eu3+ into Eu2+. In parallel, the oxygen vacancies in the CaO lattice are repaired utilizing GeO2 decomposition. Through this process, a record-high external quantum efficiency of 54.7% at 740 nm is obtained with a thermal stability greatly improved from 57% to 90% at 125 °C. The as-fabricated NIR-LEDs reach record photoelectric efficiency (100 mA@23.4%) and output power (100 mA @ 319.5 mW). This discovery of high-performance phosphors will open new research avenues for broadband NIR LED light sources in a variety of photonics applications.
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| Notes |
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_eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1002/adma.202201887
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