High-Performance NaK2Li[Li3SiO4]4:Eu Green Phosphor for Backlighting Light-Emitting Diodes

Mu Huai Fang; Carl Osby M. Mariano; Kuan Chun Chen; Jia Cheng Lin; Zhen Bao; Sebastian Mahlik; Tadeusz Lesniewski; Kuang Mao Lu; Ying Rui Lu; Yu Jong Wu; Hwo Shuenn Sheu; Jyh Fu Lee; Shu Fen Hu; Ru Shi Liu; J. Paul Attfield

doi:10.1021/acs.chemmater.1c00180

High-Performance NaK₂Li[Li₃SiO₄]₄:Eu Green Phosphor for Backlighting Light-Emitting Diodes

Mu Huai Fang, Carl Osby M. Mariano, Kuan Chun Chen, Jia Cheng Lin, Zhen Bao, Sebastian Mahlik, Tadeusz Lesniewski, Kuang Mao Lu, Ying Rui Lu, Yu Jong Wu, Hwo Shuenn Sheu, Jyh Fu Lee, Shu Fen Hu^*, Ru Shi Liu^*, J. Paul Attfield^*

^*Corresponding author for this work

Department of Physics

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

36 Citations (Scopus)

Abstract

Narrowband green phosphors with high quantum efficiency are required for backlighting white light-emitting diode (WLED) devices. Materials from the A[Li3SiO4]4:Eu2+ family have recently been proposed as having superior properties to industry-standard β-SiAlON green phosphors. Here, we show that a cheap, easily synthesized host NaK2Li[Li3SiO4]4 (NKLLSO) doped with a mixture of Eu2+ and Eu3+ is an outstanding narrowband green phosphor, with an external quantum efficiency of 51% and superb thermal stability (97.1% of room-temperature performance at 150 °C). Structural studies reveal that green emission occurs from two Eu2+ sites, while Eu3+ introduces a high concentration of vacancies that may suppress quenching from energy transfer between Eu2+ sites. A WLED package constructed using our NKLLSO phosphor shows extremely high color vividness, competitive with a β-SiAlON comparator. This work will stimulate further research on efficient green phosphors for practical WLED devices.

Original language	English
Pages (from-to)	1893-1899
Number of pages	7
Journal	Chemistry of Materials
Volume	33
Issue number	5
DOIs	https://doi.org/10.1021/acs.chemmater.1c00180
Publication status	Published - 2021 Mar 9

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering
Materials Chemistry

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Fang, M. H., Mariano, C. O. M., Chen, K. C., Lin, J. C., Bao, Z., Mahlik, S., Lesniewski, T., Lu, K. M., Lu, Y. R., Wu, Y. J., Sheu, H. S., Lee, J. F., Hu, S. F., Liu, R. S., & Attfield, J. P. (2021). High-Performance NaK₂Li[Li₃SiO₄]₄:Eu Green Phosphor for Backlighting Light-Emitting Diodes. Chemistry of Materials, 33(5), 1893-1899. https://doi.org/10.1021/acs.chemmater.1c00180

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title = "High-Performance NaK2Li[Li3SiO4]4:Eu Green Phosphor for Backlighting Light-Emitting Diodes",

abstract = "Narrowband green phosphors with high quantum efficiency are required for backlighting white light-emitting diode (WLED) devices. Materials from the A[Li3SiO4]4:Eu2+ family have recently been proposed as having superior properties to industry-standard β-SiAlON green phosphors. Here, we show that a cheap, easily synthesized host NaK2Li[Li3SiO4]4 (NKLLSO) doped with a mixture of Eu2+ and Eu3+ is an outstanding narrowband green phosphor, with an external quantum efficiency of 51% and superb thermal stability (97.1% of room-temperature performance at 150 °C). Structural studies reveal that green emission occurs from two Eu2+ sites, while Eu3+ introduces a high concentration of vacancies that may suppress quenching from energy transfer between Eu2+ sites. A WLED package constructed using our NKLLSO phosphor shows extremely high color vividness, competitive with a β-SiAlON comparator. This work will stimulate further research on efficient green phosphors for practical WLED devices.",

author = "Fang, {Mu Huai} and Mariano, {Carl Osby M.} and Chen, {Kuan Chun} and Lin, {Jia Cheng} and Zhen Bao and Sebastian Mahlik and Tadeusz Lesniewski and Lu, {Kuang Mao} and Lu, {Ying Rui} and Wu, {Yu Jong} and Sheu, {Hwo Shuenn} and Lee, {Jyh Fu} and Hu, {Shu Fen} and Liu, {Ru Shi} and Attfield, {J. Paul}",

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doi = "10.1021/acs.chemmater.1c00180",

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AU - Chen, Kuan Chun

AU - Lin, Jia Cheng

AU - Bao, Zhen

AU - Mahlik, Sebastian

AU - Lesniewski, Tadeusz

AU - Lu, Kuang Mao

AU - Lu, Ying Rui

AU - Wu, Yu Jong

AU - Sheu, Hwo Shuenn

AU - Lee, Jyh Fu

AU - Hu, Shu Fen

AU - Liu, Ru Shi

AU - Attfield, J. Paul

PY - 2021/3/9

Y1 - 2021/3/9

N2 - Narrowband green phosphors with high quantum efficiency are required for backlighting white light-emitting diode (WLED) devices. Materials from the A[Li3SiO4]4:Eu2+ family have recently been proposed as having superior properties to industry-standard β-SiAlON green phosphors. Here, we show that a cheap, easily synthesized host NaK2Li[Li3SiO4]4 (NKLLSO) doped with a mixture of Eu2+ and Eu3+ is an outstanding narrowband green phosphor, with an external quantum efficiency of 51% and superb thermal stability (97.1% of room-temperature performance at 150 °C). Structural studies reveal that green emission occurs from two Eu2+ sites, while Eu3+ introduces a high concentration of vacancies that may suppress quenching from energy transfer between Eu2+ sites. A WLED package constructed using our NKLLSO phosphor shows extremely high color vividness, competitive with a β-SiAlON comparator. This work will stimulate further research on efficient green phosphors for practical WLED devices.

AB - Narrowband green phosphors with high quantum efficiency are required for backlighting white light-emitting diode (WLED) devices. Materials from the A[Li3SiO4]4:Eu2+ family have recently been proposed as having superior properties to industry-standard β-SiAlON green phosphors. Here, we show that a cheap, easily synthesized host NaK2Li[Li3SiO4]4 (NKLLSO) doped with a mixture of Eu2+ and Eu3+ is an outstanding narrowband green phosphor, with an external quantum efficiency of 51% and superb thermal stability (97.1% of room-temperature performance at 150 °C). Structural studies reveal that green emission occurs from two Eu2+ sites, while Eu3+ introduces a high concentration of vacancies that may suppress quenching from energy transfer between Eu2+ sites. A WLED package constructed using our NKLLSO phosphor shows extremely high color vividness, competitive with a β-SiAlON comparator. This work will stimulate further research on efficient green phosphors for practical WLED devices.

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High-Performance NaK₂Li[Li₃SiO₄]₄:Eu Green Phosphor for Backlighting Light-Emitting Diodes

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