Pressure-controlled synthesis of high-performance SrLiAl3N4:Eu2+ narrow-band red phosphors

SrLiAl3N4:Eu2+ (SLA) phosphors have gained increasing attention worldwide due to their narrow emission bandwidth and excellent thermal stability. In this study, a series of SLA phosphors are synthesized at gas pressures ranging from 0.1 MPa to 100 MPa using gas pressure sintering and hot isostatic p...

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Bibliographic Details
Published in:Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2018-01, Vol.6 (38), p.10174-10178
Main Authors: Mu-Huai Fang, Yi-Ting, Tsai, Sheu, Hwo-Shuenn, Jyh-Fu, Lee, Ru-Shi, Liu
Format: Article
Language:English
Subjects:
Atomic beam spectroscopy
Emission analysis
Europium
Gas pressure
Hot pressing
Inductively coupled plasma
Oxidation
Phosphors
Quantum efficiency
Synthesis
Thermal stability
Unit cell
Valence
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Summary:SrLiAl3N4:Eu2+ (SLA) phosphors have gained increasing attention worldwide due to their narrow emission bandwidth and excellent thermal stability. In this study, a series of SLA phosphors are synthesized at gas pressures ranging from 0.1 MPa to 100 MPa using gas pressure sintering and hot isostatic press systems. Upon elevating the gas pressure in synthesis, the volume of a unit cell slightly decreases while both the quantum efficiency and the particle size of SLA increase. The Eu2+/Eu3+ ratio also increases with applied pressure, thereby enhancing the luminescence intensity of the phosphor materials. The presence of Li defects in the host material is evidenced by inductively coupled plasma with atomic emission spectroscopy. The mechanism of controlling the oxidation state of Eu and defect formation is proposed to elucidate the behavior of phosphors under different applied pressure levels during synthesis. Finally, the LED package shows that SLA could be a potential candidate for backlighting.
ISSN:2050-7526
2050-7534
DOI:10.1039/c8tc03025a