Enhanced Photoluminescence Emission and Thermal Stability from Introduced Cation Disorder in Phosphors
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 disord...
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| Veröffentlicht in: | Journal of the American Chemical Society Jg. 139; H. 34; S. 11766 |
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| Sprache: | Englisch |
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30.08.2017
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| 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
(Ca
Ba
)
Si
N
:Eu
(x = 0-1.5) phosphors. Replacing Sr by a (Ca
Ba
) 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. |
|---|---|
| AbstractList | 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
(Ca
Ba
)
Si
N
:Eu
(x = 0-1.5) phosphors. Replacing Sr by a (Ca
Ba
) 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. 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.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 | Li, Ye Fang, Mu-Huai Zhou, Wuzong Lin, Chun Che Johnston, Hannah E Tsai, Yi-Ting Whitfield, Pamela Attfield, J Paul Yu, Fengjiao Liu, Ru-Shi Wang, Jing |
| Author_xml | – sequence: 1 givenname: Chun Che surname: Lin fullname: Lin, Chun Che organization: Department of Chemistry, National Taiwan University , Taipei 106, Taiwan – sequence: 2 givenname: Yi-Ting surname: Tsai fullname: Tsai, Yi-Ting organization: Department of Chemistry, National Taiwan University , Taipei 106, Taiwan – sequence: 3 givenname: Hannah E surname: Johnston fullname: Johnston, Hannah E organization: Centre for Science at Extreme Conditions and School of Chemistry, University of Edinburgh , King's Buildings, Mayfield Road, EH9 3JZ Edinburgh, U.K – sequence: 4 givenname: Mu-Huai surname: Fang fullname: Fang, Mu-Huai organization: Department of Chemistry, National Taiwan University , Taipei 106, Taiwan – sequence: 5 givenname: Fengjiao surname: Yu fullname: Yu, Fengjiao organization: School of Chemistry, University of St Andrews , St Andrews, Fife KY16 9ST, U.K – sequence: 6 givenname: Wuzong orcidid: 0000-0001-9752-7076 surname: Zhou fullname: Zhou, Wuzong organization: School of Chemistry, University of St Andrews , St Andrews, Fife KY16 9ST, U.K – sequence: 7 givenname: Pamela surname: Whitfield fullname: Whitfield, Pamela organization: Chemical and Engineering Materials Division, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States – sequence: 8 givenname: Ye surname: Li fullname: Li, Ye organization: MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat-sen University , Guangzhou, Guangdong 510275, China – sequence: 9 givenname: Jing orcidid: 0000-0002-1246-991X surname: Wang fullname: Wang, Jing organization: MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat-sen University , Guangzhou, Guangdong 510275, China – sequence: 10 givenname: Ru-Shi orcidid: 0000-0002-1291-9052 surname: Liu fullname: Liu, Ru-Shi organization: Department of Mechanical Engineering and Graduate Institute of Manufacturing Technology, National Taipei University of Technology , Taipei 106, Taiwan – sequence: 11 givenname: J Paul orcidid: 0000-0001-9763-3987 surname: Attfield fullname: Attfield, J Paul organization: Centre for Science at Extreme Conditions and School of Chemistry, University of Edinburgh , King's Buildings, Mayfield Road, EH9 3JZ Edinburgh, U.K |
| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/28764327$$D View this record in MEDLINE/PubMed |
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| Title | Enhanced Photoluminescence Emission and Thermal Stability from Introduced Cation Disorder in Phosphors |
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