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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
Mots-clés: light-emitting diodes, near-infrared luminescence, phosphors
Créateurs: Chen, Gautier, Qiao, Xia, Zhang, Zhou
Collection: Advanced Materials
Consultations : 4/62
Indice de consultation : 9%
Indice de popularité : 2.25%
Liens URLs     https://onlinelibr ... 002/adma.202201887
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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