Abstract
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 NaAlSiO4:Eu system enables the simultaneous fulfillment of the three criteria. The Li substitution at Al sites beside Na sites in NaAlSiO 4 :Eu leads to an enhanced emission intensity/efficiency owing to an effective Eu 3+ to Eu 2+ 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 interplaywith Li-related defects. A pc-WLED using the Li-codoped NaAlSiO 4 :Eu as a green component exhibits improved performance. The phosphorswithmultiple activator sites can facilitate the positive synergistic effect on luminescence properties.
Original language | English (US) |
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Article number | eaav0363 |
Journal | Science Advances |
Volume | 5 |
Issue number | 1 |
DOIs | |
State | Published - 2019 |
ASJC Scopus subject areas
- General