Publication Date:
2019
Description:
〈p〉Solid-state phosphor-converted white light-emitting diodes (pc-WLEDs) are currently revolutionizing the lighting industry. To advance the technology, phosphors with high efficiency, tunable photoluminescence, and high thermal stability are required. Here, we demonstrate that a simple lithium incorporation in NaAlSiO〈sub〉4〈/sub〉:Eu system enables the simultaneous fulfillment of the three criteria. The Li substitution at Al sites beside Na sites in NaAlSiO〈sub〉4〈/sub〉:Eu leads to an enhanced emission intensity/efficiency owing to an effective Eu〈sup〉3+〈/sup〉 to Eu〈sup〉2+〈/sup〉 reduction, an emission color tuning from yellow to green by tuning the occupation of different Eu sites, and an improvement of luminescence thermal stability as a result of the interplay with Li-related defects. A pc-WLED using the Li-codoped NaAlSiO〈sub〉4〈/sub〉:Eu as a green component exhibits improved performance. The phosphors with multiple activator sites can facilitate the positive synergistic effect on luminescence properties.〈/p〉
Electronic ISSN:
2375-2548
Topics:
Natural Sciences in General
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