The effect of Al–O substitution for Si–N on the luminescence properties of YAG:Ce phosphor

Sopicka-Lizer, Małgorzata; Michalik, Daniel; Plewa, J.; Juestel, Thomas; Winkler, Holger; Pawlik, Tomasz

doi:10.1016/j.jeurceramsoc.2011.04.021

Cited by 46 publications

(27 citation statements)

References 15 publications

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“…The 5d centroid energy level could be lowered in (oxy)nitride phosphors as a result of higher covalence of the host lattice, as shown in our recent calculations . Efforts have been made to develop new phosphors through the incorporation of N into the garnet host . For example, the solid solution phosphors RE 3 Al 5 − x Si x O 12 − x N x :Ce 3+ , are synthesized by adding Si 3 N 4 in starting materials.…”

Section: Introductionmentioning

confidence: 57%

“…As nitrogen has a lower electronegativity (χ(N) ≈ 3.04) than oxygen (χ(O) ≈ 3.44), the covalency of Ce 3+ –N 3− bonds is higher than that of Ce 3+ –O 2− ones, which would result in a lowering of the 5d 1 excited energy levels and thus a redshifted emission. However, the incorporation of N tends to cause the formation of impurity phases, leading to low quantum efficiency . The presence of impurity phases is due to the decrease in the garnet structural stability, when the smaller anion O 2− (132 pm) is replaced by larger anion N 3− (171 pm).…”

Section: Resultsmentioning

confidence: 99%

“…To facilitate incorporation of N into the garnet host, a series of samples have been synthesized with different cooperative cations for the nitridation of garnet phosphor Y 2.94 − x A x Al 5 − y B y O 12 − z N z :0.06Ce 3+ (A = Zr 4+ , Mg 2+ ; B = Mg 2+ , Si 4+ , Zr 4+ ). As reported in the literature, the incorporation of singly smaller cation Si 4+ into Al 3+ sites (in the substitution form of Si 4+ ‐N 3− into Al 3+ ‐O 2− ) cannot facilitate the substitution of N into the garnet lattice . So firstly, taking into account of the ionic radius and ionic charge, samples with nominal formula Y 2.94 − x Zr x Al 5 O 12 − x N x :0.06Ce 3+ ( x = 0, 0.5, 1, 1.5, 2) were synthesized by incorporation of smaller Zr 4+ (84 pm) into dodecahedral Y 3+ (101.9 pm).…”

Section: Resultsmentioning

confidence: 99%

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Cooperative cation substitution facilitated construction of garnet oxynitride MgY₂Al₃Si₂O₁₁N:Ce³⁺ for white LEDs

Pan

Wang

et al. 2018

J Am Ceram Soc

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Structural modification is an important means to induce redshift of Ce3+ emission in garnet phosphor. We intend to design and synthesize garnet oxynitride compounds which combine attributes of rigidity inherited from garnet structure and of high covalence characteristic of oxynitride compounds. However, impurity phase usually occurs in the nitridation of garnet phosphor, due to the low solubility of nitrogen in oxides. We herein exploit the cooperative cation substitution strategy to facilitate the incorporation of nitrogen in Y3Al5O12. It is found that partial substitution of Y3+‐Altet3+ pairs by Mg2+‐Si4+ pairs can diminish the phase instability caused by the replacement of Altet3+‐O2− by Si4+‐N3−. A novel pure garnet phase oxynitride phosphor MgY2Al3Si2O11N:Ce3+ with a higher substitution content of N has been obtained and the successful incorporation of N in the garnet phosphor is confirmed by the Rietveld refinements of XRD, XPS, and TEM. The emission and excitation spectra indicate that the blue‐light‐excitable MgY2Al3Si2O11N:Ce3+ phosphor exhibited a bright yellow‐orange emission peaking at 570 nm, which is redshifted by 28 nm when compared to YAG:Ce3+. The garnet oxynitride phosphor exhibit excellent thermal stability with high quantum efficiency and is a promising candidate for warm white LED.

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Section: Introductionmentioning

confidence: 57%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Cooperative cation substitution facilitated construction of garnet oxynitride MgY₂Al₃Si₂O₁₁N:Ce³⁺ for white LEDs

Pan

Wang

et al. 2018

J Am Ceram Soc

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“…The weight loss of Si 3 N 4 balls during milling is around 0.03 wt.%. The earlier works proved that Si 3 N 4 contamination due to milling does not affect transparency; however, it can slightly influence the luminescence spectra [35,36].…”

Section: Resultsmentioning

confidence: 98%

Fabrication and optical studies of transparent Tm, Ho:YAG ceramics

et al. 2015

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“…[25][26][27][28][29][30] It means that the interaction between luminescent ions is strong at this inter-ionic distance. In the CeAl 11 [31][32][33][34][35][36][37][38][39][40] Like BAM: Eu 2+ blue-emitting phosphor, aluminates phosphors suffer from serious deterioration of luminescence efficiency during continuous excitation in fluorescent lamps. 41 Wang et al have successfully proposed a new method of Si-N doping in BAM: Eu 2+ phosphor to improve its luminescence intensity and thermal stability.…”

Section: Resultsmentioning

confidence: 99%

Tunable Luminescence of CeAl₁₁O₁₈Based Phosphors by Replacement of (AlO)⁺by (SiN)⁺and Co-Doping with Eu

Yin

Chen

Wang

et al. 2014

ECS J. Solid State Sci. Technol.

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A series of Si-N or Eu-Li doped CeAl 11 O 18 and CeAl 12 O 18 N phosphors are prepared by solid-state reaction. Their structure and luminescence are researched carefully. Si-N doping with the concentration less than 8% can be successfully dissolved into CeAl 11 O 18 crystal lattice and doesn't change the matrix structure, only resulting in crystal lattice shrinkage due to the shorter bond length for Si-N bond versus Al-O bond. It is observed that blue emission gradually decreases and UV emission becomes stronger due to the gradual disappearance of O Me ions with the increase of Si-N doping. 1-7 These phosphors show some features of high quantum yield, chemical and radiation stability, which make them still under research in many areas now. It is demonstrated here that some aluminates will show very interesting results by tuning the crystal structure slightly, despite (oxy)nitride based phosphors are researched widely and greatly developed recently due to their high quantum efficiency, excellent thermal, physical and chemical stabilities, and therefore show large potential to be implemented in highly efficient and reliable white LEDs. [8][9][10] Generally, the hexagonal aluminates are divided into three different groups:11-13 1. compounds MeAl 12 O 19 (Me = Ca, Sr, Eu) with magnetoplumbite-type structure; 2. compounds MeMgAl 10 O 17 (Me = Ba, Sr, Eu) with β-alumina structure; 3. distorted magnetoplumbitetype structure such as CeAl 11 O 18 . The β-alumina structures and magnetoplumbite are both composed of spinel blocks formed by the close packing of Al and O atoms. There is the merely significant difference in the two mirror planes (z = 0.25 and 0.75) between these two structures. In the β-alumina structure, each mirror plane contains one large cation and one oxygen. The non-close-packed mirror plane is connected with the stable spinel blocks closely. In the magnetoplumbite structure, the mirror planes contain one large cation and more oxygens 1. Generally, CeAl 11 O 18 is considered to have distorted magnetoplumbite structure. The difference from the normal magnetoplumbite-type structure is that La (Ce) large ions are considered to be partially replaced by O ions, O Me as an abbreviation.11 O Me is present because of non-ideal stoichiometry of CeAl 11 O 18 with respect to the ideal MeAl 12 O 19 composition for magnetoplumbite structure (large-cation/small-cation/anion = 1/12/19). Just due to this disorder, CeAl 11 O 18 exhibits special luminescence properties, which will be discussed later.Within those hexagonal aluminates, as a kind of self-activated phosphor, CeAl 11 O 18 shows very interesting characteristics, i.e. two emission peaks one UV band at ∼350 nm and one main blue band at ∼460 nm respectively. As we know, UV light can kill bacteria effectively and blue light is essential in photosynthesis for green plant. Due to its special luminescence properties, CeAl 11 O 18 based phosphors have been applied in sterilization, therapeutic, cosmetic skin treatment and promoting plant growth in greenhouse.14 To meet...

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The effect of Al–O substitution for Si–N on the luminescence properties of YAG:Ce phosphor

Cited by 46 publications

References 15 publications

Cooperative cation substitution facilitated construction of garnet oxynitride MgY₂Al₃Si₂O₁₁N:Ce³⁺ for white LEDs

Cooperative cation substitution facilitated construction of garnet oxynitride MgY₂Al₃Si₂O₁₁N:Ce³⁺ for white LEDs

Fabrication and optical studies of transparent Tm, Ho:YAG ceramics

Tunable Luminescence of CeAl₁₁O₁₈Based Phosphors by Replacement of (AlO)⁺by (SiN)⁺and Co-Doping with Eu

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The effect of Al–O substitution for Si–N on the luminescence properties of YAG:Ce phosphor

Cited by 46 publications

References 15 publications

Cooperative cation substitution facilitated construction of garnet oxynitride MgY2Al3Si2O11N:Ce3+ for white LEDs

Cooperative cation substitution facilitated construction of garnet oxynitride MgY2Al3Si2O11N:Ce3+ for white LEDs

Fabrication and optical studies of transparent Tm, Ho:YAG ceramics

Tunable Luminescence of CeAl11O18Based Phosphors by Replacement of (AlO)+by (SiN)+and Co-Doping with Eu

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Cooperative cation substitution facilitated construction of garnet oxynitride MgY₂Al₃Si₂O₁₁N:Ce³⁺ for white LEDs

Cooperative cation substitution facilitated construction of garnet oxynitride MgY₂Al₃Si₂O₁₁N:Ce³⁺ for white LEDs

Tunable Luminescence of CeAl₁₁O₁₈Based Phosphors by Replacement of (AlO)⁺by (SiN)⁺and Co-Doping with Eu