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

47 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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10.1021/acs.chemmater.1c00180

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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 - Mariano, Carl Osby M.

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

Abstract

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