Synthesis of Eu x Si6−z Al z O z N8−z green phosphor and its luminescent properties

Ryu, Jeong Ho; Won, Hyong Sik; Park, Youn-Gon; Kim, Sang Hyun; Song, Won Young; Suzuki, Hideo; Yoon, Chang-Hwan

doi:10.1007/s00339-008-5044-7

Cited by 45 publications

(18 citation statements)

References 17 publications

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“…These two excitation bands correspond to 4 f 7 →4 f 6 5 d electron transition of Eu 2+ ions . Compared with the previous studies on Eu 2+ doped β‐SiAlON, the excitation bands exhibit a blue shift in our experiments. In samples of Si 6− z Al z − x O z + x N 8− z − x : x Eu, a larger z value ( z = 1.000) implies more Al–O bonds substituting Si–N bonds.…”

Section: Resultsmentioning

confidence: 99%

Eu‐Doped β‐SiAlON Phosphors: Template‐Assistant Low Temperature Synthesis, Dual Band Emission, and High‐Thermal Stability

et al. 2014

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A hard template route has been successfully developed for synthesis of b-SiAlON:Eu phosphors at low temperatures. The synthesis utilizes mesoporous silica (SBA-15) skeleton as an active Si source, combined with the carbothermal reduction and nitridation method. It has been shown that the additional driving force from high surface area and porosity of SBA-15 enables b-SiAlON:Eu (with compositions ofxEu, x = 0.010-0.200 and z = 1.000) phosphors to be formed as a dominant phase at low temperature of 1400°C. The resultant b-SiAlON:Eu phosphor powders exhibit a typical rod-like morphology and a well dispersed state. By tailoring the Eu 2+ concentration in the phosphors, a continuous change in emission band can be realized, that is a blue emission dominated for low Eu 2+ concentrations and a green emission dominated for high Eu 2+ doping concentrations. Furthermore, the resultant phosphors exhibit a small thermal quenching up to high temperature of 250°C. Therefore, the developed method is beneficial to synthesize LED phosphors of oxynitride systems at lower temperatures.

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Section: Resultsmentioning

confidence: 99%

Eu‐Doped β‐SiAlON Phosphors: Template‐Assistant Low Temperature Synthesis, Dual Band Emission, and High‐Thermal Stability

et al. 2014

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“…Doping these rare-earth ions into β-SiAlON host lattice also can obtain optimal PL properties. Through extensive investigation of Eu 2+ -activated β-SiAlON, a green-emitting phosphor has been developed, which is superior to commercial green-yellow phosphors YAG : Ce 3+ and ZnS : Cu, Al [13][14][15], [20,21]. Similar to Eu 2+ , Yb 2+ commonly exhibits 4f-5d fluorescence.…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence properties of β-SiAlON:Yb²⁺, a novel green-emitting phosphor for white light-emitting diodes

Liu

Xie

Hirosaki

et al. 2011

Science and Technology of Advanced Materials

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We have synthesized Yb 2+ -activated Si 6−z Al z O z N 8−z (0.05 z 2.3, 0.03 mol% Yb 2+ 0.7 mol%) green phosphors by solid-state reaction at 1900• C for 2 h under a nitrogen pressure of 1.0 MPa. Phase purity, photoluminescence and its thermal quenching were investigated. A single phase was obtained for all values of z and Yb 2+ concentration. A distinct emission band was observed at 540 nm originating from the 5d-4f electronic transition in Yb 2+ under 480 nm excitation. The photoluminescence properties mainly depended on the Yb 2+ concentration and chemical composition of the matrix. The resultant phosphor showed high thermal stability, that is, the emission intensity at 150• C was about 82% of that measured at room temperature. The experimental results indicate that β-SiAlON : Yb 2+ is a potential green phosphor for white light-emitting diodes (LEDs), which use blue LEDs as the primary light source.

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“…In recent studies, combining ultraviolet (UV) LED chips with tricolor high‐covalency phosphors (such as oxynitrides and nitrides) has overcome these problems. Several reports indicated that oxynitrides (such as MSi 2 O 2 N 2 :Ce 3+ /Eu 2+ (M=Ca, Sr, Ba) and SiAlON:Ce 3+ /Eu 2+ ) 5,6 and nitrides (such as M 2 Si 5 N 8 :Ce 3+ /Eu 2+ (M=Ca, Sr, Ba) and CaAlSiN 3 :Ce 3+ /Eu 2+ ) 7,8 phosphors possessed higher chemical and thermal stability than YAG:Ce 3+ . However, the high covalency of these phosphors commonly lowers the excited energy level of the activators, leading to a red‐shift in the emission wavelength 9 .…”

Section: Introductionmentioning

confidence: 99%

Color-tunable Y2Si4N6C:Ce3+ Carbonitride Phosphors for Ultraviolet Light-Emitting Diodes

Hsu

2011

Journal of the American Ceramic Society

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La3+/Ce3+‐codoped carbonitride phosphors‐Y2Si4N6C were synthesized via a carbothermal reduction nitridation route. For the Ce3+‐doped Y2Si4N6C phosphors, the emission spectrum exhibited a broad band at around 538 nm due to the f–d transition of Ce3+ ions. When La3+ ions were incorporated into the host, the emitting colors of (Y, La)2Si4N6C: Ce3+ phosphors varied from a yellowish green to blue region. The great blue shift in emission bands was due to the variation in the crystal‐field strength around the activators. In addition, (Y, La)2Si4N6C:Ce3+ phosphors exhibited high thermal stability, indicating the superior suitability in ultraviolet light‐emitting diodes.

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Synthesis of Eu x Si6−z Al z O z N8−z green phosphor and its luminescent properties

Cited by 45 publications

References 17 publications

Eu‐Doped β‐SiAlON Phosphors: Template‐Assistant Low Temperature Synthesis, Dual Band Emission, and High‐Thermal Stability

Eu‐Doped β‐SiAlON Phosphors: Template‐Assistant Low Temperature Synthesis, Dual Band Emission, and High‐Thermal Stability

Photoluminescence properties of β-SiAlON:Yb²⁺, a novel green-emitting phosphor for white light-emitting diodes

Color-tunable Y2Si4N6C:Ce3+ Carbonitride Phosphors for Ultraviolet Light-Emitting Diodes

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Synthesis of Eu x Si6−z Al z O z N8−z green phosphor and its luminescent properties

Cited by 45 publications

References 17 publications

Eu‐Doped β‐SiAlON Phosphors: Template‐Assistant Low Temperature Synthesis, Dual Band Emission, and High‐Thermal Stability

Eu‐Doped β‐SiAlON Phosphors: Template‐Assistant Low Temperature Synthesis, Dual Band Emission, and High‐Thermal Stability

Photoluminescence properties of β-SiAlON:Yb2+, a novel green-emitting phosphor for white light-emitting diodes

Color-tunable Y2Si4N6C:Ce3+ Carbonitride Phosphors for Ultraviolet Light-Emitting Diodes

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Product

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Photoluminescence properties of β-SiAlON:Yb²⁺, a novel green-emitting phosphor for white light-emitting diodes