Enhanced Photoluminescence Emission and Thermal Stability from Introduced Cation Disorder in Phosphors

Chun Che Lin; Yi Ting Tsai; Hannah E. Johnston; Mu Huai Fang; Fengjiao Yu; Wuzong Zhou; Pamela Whitfield; Ye Li; Jing Wang; Ru Shi Liu; J. Paul Attfield

doi:10.1021/jacs.7b04338

Enhanced Photoluminescence Emission and Thermal Stability from Introduced Cation Disorder in Phosphors

Chun Che Lin, Yi Ting Tsai, Hannah E. Johnston, Mu Huai Fang, Fengjiao Yu, Wuzong Zhou, Pamela Whitfield, Ye Li, Jing Wang, Ru Shi Liu, J. Paul Attfield

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

214 Citations (Scopus)

Abstract

Optimizing properties of phosphors for use in white-light-emitting diodes (WLEDs) is an important materials challenge. Most phosphors have a low level of lattice disorder due to mismatch between the host and activator cations. Here we show that deliberate introduction of high levels of cation disorder leads to significant improvements in quantum efficiency, stability to thermal quenching, and emission lifetime in Sr_1.98-x(Ca_0.55Ba_0.45)_xSi₅N₈:Eu_0.02 (x = 0-1.5) phosphors. Replacing Sr by a (Ca_0.55Ba_0.45) mixture with the same average radius increases cation size variance, resulting in photoluminescence emission increases of 20-26% for the x = 1.5 sample relative to the x = 0 parent across the 25-200 °C range that spans WLED working temperatures. Cation disorder suppresses nonradiative processes through disruption of lattice vibrations and creates deep traps that release electrons to compensate for thermal quenching. Introduction of high levels of cation disorder may thus be a very useful general approach for improving the efficiency of luminescent materials.

Original language	English
Pages (from-to)	11766-11770
Number of pages	5
Journal	Journal of the American Chemical Society
Volume	139
Issue number	34
DOIs	https://doi.org/10.1021/jacs.7b04338
Publication status	Published - Aug 30 2017
Externally published	Yes

ASJC Scopus subject areas

Catalysis
General Chemistry
Biochemistry
Colloid and Surface Chemistry

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title = "Enhanced Photoluminescence Emission and Thermal Stability from Introduced Cation Disorder in Phosphors",

abstract = "Optimizing properties of phosphors for use in white-light-emitting diodes (WLEDs) is an important materials challenge. Most phosphors have a low level of lattice disorder due to mismatch between the host and activator cations. Here we show that deliberate introduction of high levels of cation disorder leads to significant improvements in quantum efficiency, stability to thermal quenching, and emission lifetime in Sr1.98-x(Ca0.55Ba0.45)xSi5N8:Eu0.02 (x = 0-1.5) phosphors. Replacing Sr by a (Ca0.55Ba0.45) mixture with the same average radius increases cation size variance, resulting in photoluminescence emission increases of 20-26% for the x = 1.5 sample relative to the x = 0 parent across the 25-200 °C range that spans WLED working temperatures. Cation disorder suppresses nonradiative processes through disruption of lattice vibrations and creates deep traps that release electrons to compensate for thermal quenching. Introduction of high levels of cation disorder may thus be a very useful general approach for improving the efficiency of luminescent materials.",

author = "Lin, {Chun Che} and Tsai, {Yi Ting} and Johnston, {Hannah E.} and Fang, {Mu Huai} and Fengjiao Yu and Wuzong Zhou and Pamela Whitfield and Ye Li and Jing Wang and Liu, {Ru Shi} and Attfield, {J. Paul}",

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year = "2017",

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doi = "10.1021/jacs.7b04338",

language = "English",

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AU - Lin, Chun Che

AU - Tsai, Yi Ting

AU - Johnston, Hannah E.

AU - Fang, Mu Huai

AU - Yu, Fengjiao

AU - Zhou, Wuzong

AU - Whitfield, Pamela

AU - Li, Ye

AU - Wang, Jing

AU - Liu, Ru Shi

AU - Attfield, J. Paul

PY - 2017/8/30

Y1 - 2017/8/30

N2 - Optimizing properties of phosphors for use in white-light-emitting diodes (WLEDs) is an important materials challenge. Most phosphors have a low level of lattice disorder due to mismatch between the host and activator cations. Here we show that deliberate introduction of high levels of cation disorder leads to significant improvements in quantum efficiency, stability to thermal quenching, and emission lifetime in Sr1.98-x(Ca0.55Ba0.45)xSi5N8:Eu0.02 (x = 0-1.5) phosphors. Replacing Sr by a (Ca0.55Ba0.45) mixture with the same average radius increases cation size variance, resulting in photoluminescence emission increases of 20-26% for the x = 1.5 sample relative to the x = 0 parent across the 25-200 °C range that spans WLED working temperatures. Cation disorder suppresses nonradiative processes through disruption of lattice vibrations and creates deep traps that release electrons to compensate for thermal quenching. Introduction of high levels of cation disorder may thus be a very useful general approach for improving the efficiency of luminescent materials.

AB - Optimizing properties of phosphors for use in white-light-emitting diodes (WLEDs) is an important materials challenge. Most phosphors have a low level of lattice disorder due to mismatch between the host and activator cations. Here we show that deliberate introduction of high levels of cation disorder leads to significant improvements in quantum efficiency, stability to thermal quenching, and emission lifetime in Sr1.98-x(Ca0.55Ba0.45)xSi5N8:Eu0.02 (x = 0-1.5) phosphors. Replacing Sr by a (Ca0.55Ba0.45) mixture with the same average radius increases cation size variance, resulting in photoluminescence emission increases of 20-26% for the x = 1.5 sample relative to the x = 0 parent across the 25-200 °C range that spans WLED working temperatures. Cation disorder suppresses nonradiative processes through disruption of lattice vibrations and creates deep traps that release electrons to compensate for thermal quenching. Introduction of high levels of cation disorder may thus be a very useful general approach for improving the efficiency of luminescent materials.

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Enhanced Photoluminescence Emission and Thermal Stability from Introduced Cation Disorder in Phosphors

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