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Enhanced Photoluminescence Emission and Thermal Stability from Introduced Cation Disorder in Phosphors
- Source :
- Lin, C C, Tsai, Y-T, Johnston, H E, Fang, M-H, Yu, F, Zhou, W, Whitfield, P, Li, Y, Wang, J, Liu, R-S & Attfield, J P 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
- Publication Year :
- 2017
- Publisher :
- American Chemical Society (ACS), 2017.
-
Abstract
- This work was supported by the Ministry of Science and Technology of Taiwan (Contract No. MOST 104‒2113‒M‒002‒012‒MY3), EPSRC and STFC, UK. This research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. 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. Postprint
- Subjects :
- Photoluminescence
LIGHT-EMITTING-DIODES
NDAS
Analytical chemistry
LUMINESCENCE PROPERTIES
Phosphor
02 engineering and technology
Electron
010402 general chemistry
01 natural sciences
Biochemistry
BAND
Catalysis
Colloid and Surface Chemistry
Lattice (order)
Activator (phosphor)
OXYNITRIDE
CAALSIN3
QD
Thermal stability
WHITE LEDS
R2C
Diode
CRYSTAL
Chemistry
SUBSTITUTION
General Chemistry
QD Chemistry
021001 nanoscience & nanotechnology
0104 chemical sciences
Quantum efficiency
BDC
0210 nano-technology
Subjects
Details
- ISSN :
- 15205126 and 00027863
- Volume :
- 139
- Database :
- OpenAIRE
- Journal :
- Journal of the American Chemical Society
- Accession number :
- edsair.doi.dedup.....17375bc10f0fae281dba08f71cc1f0ee