Luminescence Properties of Terbium-, Cerium-, or Europium-Doped α-Sialon Materials

Krevel, van Jwh Joost; Rutten, van Jwt; Mandal, Hasan; Hintzen, Htjm Bert; Metselaar, R Ruud

doi:10.1006/jssc.2001.9484

Cited by 333 publications

(278 citation statements)

References 28 publications

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“…Oxynitride or nitride phosphors doped with rare-earth elements often exhibit longer excitation and emission wavelengths than their oxide counterparts, owing to large crystal-field splitting and strong nephelauxetic effect resulting from the coordination of rare-earth ions to nitrogen [1][2][3][4][5][6][7]. Besides, the oxynitride and nitride phosphors are expected to have high thermal and chemical stabilities because their matrices are built on stiff frameworks consisting of Si-N or Al-N tetrahedra [8][9][10].…”

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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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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“…The Me elements that have been reported to stabilize the a-SiAlON structure are Li, Mg, Ca, Y and the rare-earth metals except for Ce, La, Pr and Eu [1][2][3][4]. Generally, it is impossible to stabilize the a-SiAlON structure for rare-earth metals with a large ionic size such as Eu 2+ and Ce 3+ , but it is possible if they are codoped with calcium [5,6]. Moreover, the prepared Ca-a-SiAlON:Eu phosphors show strong absorption in the UV-visible spectral region, exhibit intense yellow emission from 570 to 600 nm, and are promising wavelengthconversion phosphors for white light-emitting diodes (LEDs) when coupled with a blue GaN-based chip [7,8].…”

mentioning

confidence: 99%

Fine yellowα-SiAlON:Eu phosphors for white LEDs prepared by the gas-reduction–nitridation method

Hirosaki

Xie

et al. 2007

Science and Technology of Advanced Materials

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Yellow-emitting a-SiAlON:Eu 2+ phosphors were synthesized by the gas reduction and nitridation of a homogeneous oxide precursor in a CaO-Al 2 O 3 -SiO 2 -Eu 2 O 3 system at 1400-1450 1C using an NH 3 -CH 4 mixture gas as a reduction-nitridation agent. The precursor was prepared by a sol-gel process using a low-cost nitrate, tetraethyl orthosilicate and citric acid as the starting materials. The effects of reaction parameters such as heating rate, temperature, holding time and CH 4 content on the composition, microstructure and photoluminescence of the prepared powders were investigated. Nearly single-phase a-SiAlON was successfully synthesized by the onestep gas reduction and nitridation without the need for post-annealing at a higher temperature. The prepared powders consisted of relatively well-dispersed and uniform crystals with a hexagonal shape. The photoluminescence spectra of Eu-doped Ca-a-SiAlON phosphors excited by near-ultraviolet or blue light showed a broad, yellow emission band at 500-700 nm, which agrees well with that obtained from phosphors prepared by the conventional solid-state reaction. r

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“…The peak absorption cross-section in the blue spectral region was not reported, and will have to be determined in future work. Several papers have been published on the preparation of luminescent SiA1ON phosphor powders [28][29][30], and will be drawn upon in the present work.…”

Section: Task 4 Investigate Techniques To Improve the External Quantmentioning

confidence: 99%

Novel Coatings for Enhancement of Light-Emitting Diodes (LEDs)

Smilgys¹,

Shatz²,

Bortz³

2006

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Luminescence Properties of Terbium-, Cerium-, or Europium-Doped α-Sialon Materials

Cited by 333 publications

References 28 publications

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

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

Fine yellowα-SiAlON:Eu phosphors for white LEDs prepared by the gas-reduction–nitridation method

Novel Coatings for Enhancement of Light-Emitting Diodes (LEDs)

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Luminescence Properties of Terbium-, Cerium-, or Europium-Doped α-Sialon Materials

Cited by 333 publications

References 28 publications

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

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

Fine yellowα-SiAlON:Eu phosphors for white LEDs prepared by the gas-reduction–nitridation method

Novel Coatings for Enhancement of Light-Emitting Diodes (LEDs)

Contact Info

Product

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

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