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 journalArticle

62 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 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.

Original languageEnglish
Pages (from-to)11766-11770
Number of pages5
JournalJournal of the American Chemical Society
Volume139
Issue number34
DOIs
Publication statusPublished - Aug 30 2017
Externally publishedYes

Fingerprint

Phosphors
Cations
Photoluminescence
Thermodynamic stability
Hot Temperature
Positive ions
Light emitting diodes
Quenching
Light
Lattice vibrations
Vibration
Quantum efficiency
Electrons
Temperature

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Enhanced Photoluminescence Emission and Thermal Stability from Introduced Cation Disorder in Phosphors. / Lin, Chun Che; Tsai, Yi Ting; Johnston, Hannah E.; Fang, Mu Huai; Yu, Fengjiao; Zhou, Wuzong; Whitfield, Pamela; Li, Ye; Wang, Jing; Liu, Ru Shi; Attfield, J. Paul.

In: Journal of the American Chemical Society, Vol. 139, No. 34, 30.08.2017, p. 11766-11770.

Research output: Contribution to journalArticle

Lin, CC, Tsai, YT, Johnston, HE, Fang, MH, Yu, F, Zhou, W, Whitfield, P, Li, Y, Wang, J, Liu, RS & Attfield, JP 2017, 'Enhanced Photoluminescence Emission and Thermal Stability from Introduced Cation Disorder in Phosphors', Journal of the American Chemical Society, vol. 139, no. 34, pp. 11766-11770. https://doi.org/10.1021/jacs.7b04338
Lin, Chun Che ; Tsai, Yi Ting ; Johnston, Hannah E. ; Fang, Mu Huai ; Yu, Fengjiao ; Zhou, Wuzong ; Whitfield, Pamela ; Li, Ye ; Wang, Jing ; Liu, Ru Shi ; Attfield, J. Paul. / Enhanced Photoluminescence Emission and Thermal Stability from Introduced Cation Disorder in Phosphors. In: Journal of the American Chemical Society. 2017 ; Vol. 139, No. 34. pp. 11766-11770.
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