Li substituent tuning of LED phosphors with enhanced efficiency, tunable photoluminescence, and improved thermal stability

Ming Zhao; Zhiguo Xia; Xiaoxiao Huang; Lixin Ning; Romain Gautier; Maxim S. Molokeev; Yayun Zhou; Yu Chun Chuang; Qinyuan Zhang; Quanlin Liu; Kenneth R. Poeppelmeier

doi:10.1126/sciadv.aav0363

Li substituent tuning of LED phosphors with enhanced efficiency, tunable photoluminescence, and improved thermal stability

Ming Zhao, Zhiguo Xia^*, Xiaoxiao Huang, Lixin Ning, Romain Gautier, Maxim S. Molokeev, Yayun Zhou, Yu Chun Chuang, Qinyuan Zhang, Quanlin Liu, Kenneth R. Poeppelmeier

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

147 Scopus citations

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)
Article number	eaav0363
Journal	Science Advances
Volume	5
Issue number	1
DOIs	https://doi.org/10.1126/sciadv.aav0363
State	Published - 2019

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@article{63e44bb7bd414af5ad2dc9ab511f25eb,

title = "Li substituent tuning of LED phosphors with enhanced efficiency, tunable photoluminescence, and improved thermal stability",

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.",

author = "Ming Zhao and Zhiguo Xia and Xiaoxiao Huang and Lixin Ning and Romain Gautier and Molokeev, {Maxim S.} and Yayun Zhou and Chuang, {Yu Chun} and Qinyuan Zhang and Quanlin Liu and Poeppelmeier, {Kenneth R.}",

note = "Funding Information: This research was supported by the National Natural Science Foundation of China (nos. 51722202, 91622125, 51572023, and 11574003) and Natural Science Foundations of Beijing (2172036), and this work was also supported by funding from the National Science Foundation (award DMR-1608218) and French National Agency for Research (ANR Young Researchers: ANR-16-CE08-0003-01). Publisher Copyright: {\textcopyright} 2019 American Association for the Advancement of Science. All rights reserved.",

year = "2019",

doi = "10.1126/sciadv.aav0363",

language = "English (US)",

volume = "5",

journal = "Science advances",

issn = "2375-2548",

publisher = "American Association for the Advancement of Science",

number = "1",

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TY - JOUR

T1 - Li substituent tuning of LED phosphors with enhanced efficiency, tunable photoluminescence, and improved thermal stability

AU - Zhao, Ming

AU - Xia, Zhiguo

AU - Huang, Xiaoxiao

AU - Ning, Lixin

AU - Gautier, Romain

AU - Molokeev, Maxim S.

AU - Zhou, Yayun

AU - Chuang, Yu Chun

AU - Zhang, Qinyuan

AU - Liu, Quanlin

AU - Poeppelmeier, Kenneth R.

N1 - Funding Information: This research was supported by the National Natural Science Foundation of China (nos. 51722202, 91622125, 51572023, and 11574003) and Natural Science Foundations of Beijing (2172036), and this work was also supported by funding from the National Science Foundation (award DMR-1608218) and French National Agency for Research (ANR Young Researchers: ANR-16-CE08-0003-01). Publisher Copyright: © 2019 American Association for the Advancement of Science. All rights reserved.

PY - 2019

Y1 - 2019

N2 - 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.

AB - 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.

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Li substituent tuning of LED phosphors with enhanced efficiency, tunable photoluminescence, and improved thermal stability

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