Synthesis and Luminescent Characteristics of Sr2Ga2S5:Eu2+ Yellow Phosphor for LEDs

EuM2S4 (M = Ga, Al) phosphors were synthesized using the solid‐state reaction method. The structure and photoluminescence (PL) properties of the phosphors were investigated in detail. XRD pattern results indicated that the two phosphors are isostructures to the orthorhombic structure. The PL spectra showed that the EuGa2S4 and EuAl2S4 phosphors can be excited efficiently by UV–visible light from 350 to 480 nm and that they emit intense green and bluish‐green light, with emission bands peaking at 545 and 506 nm, respectively. The fluorescence lifetimes of Eu2+ were calculated to be 0.076 and 0.064 µs for EuGa2S4 and EuAl2S4, respectively. The thermal quenching temperature was 412 K for EuGa2S4. A green LED was fabricated by the combination of a near‐UV InGaN chip and the prepared EuGa2S4 phosphor. The EuGa2S4 phosphor exhibits much better green color purity than EuAl2S4. As a result, EuGa2S4 might be a promising green phosphor candidate for solid‐state lighting LED technology.

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Luminescence properties of stoichiometric EuM₂S₄ (M = Ga, Al) conversion phosphors for white LED applications

Yang

Moon

et al. 2012

Physica Status Solidi (a)

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Photoluminescence Properties of Green-Emitting ZnGa₂S₄:Eu²⁺Phosphor

Yu¹,

Luan²,

Wang³

et al. 2012

J. Electrochem. Soc.

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Green-emitting ZnGa 2 S 4 :Eu 2+ phosphors have been synthesized by solid state reaction. Their luminescence properties have been investigated by photoluminescence excitation and emission spectra, concentration quenching, thermal quenching and photoluminescence decay. The critical dopant concentration is found to be 0.05 mol of Eu 2+ and the critical transfer distance of Eu 2+ is calculated as 17 Å. The thermal quenching result suggests that the phosphor does not have good thermal-quenching property. Its chromaticity coordinates are very close to those of SrGa 2 S 4 :Eu 2+ . Because of their broadband absorption in the region 350-520 nm, the ZnGa 2 S 4 :0.05Eu 2+ phosphor can be a good green phosphor candidate for creating white light in phosphor-converted white LEDs, when combined with RB phosphors and a UV LED.

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Eu2+-doped Thioaluminates: New Candidates for White LEDs

Yu¹,

Wang²,

Zhang³

et al. 2008

Chemistry Letters

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Three Eu2+-doped thioaluminate phosphors with different light-emitting colors, green, bluish-green, and blue were synthesized by the evacuated sealed quartz ampoule method. Under UV excitation, CaAl2S4:Eu2+ (CAS), SrAl2S4:Eu2+ (SAS), and BaAl2S4:Eu2+ (BAS) exhibit strong emission bands peaked at 516, 496, and 470 nm, respectively. The fabricated LEDs of CAS, SAS, and BAS show intense green, bluish-green, and blue lighting. They are all believed to be good phosphor candidates for creating white light in phosphor-converted white LEDs.

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Synthesis and Luminescent Characteristics of Sr2Ga2S5:Eu2+ Yellow Phosphor for LEDs

Cited by 5 publications

References 13 publications

Luminescence properties of stoichiometric EuM₂S₄ (M = Ga, Al) conversion phosphors for white LED applications

Luminescence properties of stoichiometric EuM₂S₄ (M = Ga, Al) conversion phosphors for white LED applications

Photoluminescence Properties of Green-Emitting ZnGa₂S₄:Eu²⁺Phosphor

Eu2+-doped Thioaluminates: New Candidates for White LEDs

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Synthesis and Luminescent Characteristics of Sr2Ga2S5:Eu2+ Yellow Phosphor for LEDs

Cited by 5 publications

References 13 publications

Luminescence properties of stoichiometric EuM2S4 (M = Ga, Al) conversion phosphors for white LED applications

Luminescence properties of stoichiometric EuM2S4 (M = Ga, Al) conversion phosphors for white LED applications

Photoluminescence Properties of Green-Emitting ZnGa2S4:Eu2+Phosphor

Eu2+-doped Thioaluminates: New Candidates for White LEDs

Contact Info

Product

Resources

About

Luminescence properties of stoichiometric EuM₂S₄ (M = Ga, Al) conversion phosphors for white LED applications

Luminescence properties of stoichiometric EuM₂S₄ (M = Ga, Al) conversion phosphors for white LED applications

Photoluminescence Properties of Green-Emitting ZnGa₂S₄:Eu²⁺Phosphor