Synthesis and optical properties of yellow emitting garnet phosphors for pcLEDs

Katelnikovas, Artūras; Šakirzanovas, Simas; Dutczak, Danuta; Plewa, J.; Enseling, David; Winkler, Holger; Kareiva, Aivaras; Jüstel, Thomas

doi:10.1016/j.jlumin.2012.11.012

Cited by 51 publications

(21 citation statements)

References 17 publications

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“…Note that this class of materials is different from the Mg 2+ -Si 4+ substitution for Al 3+ -Al 3+ in Al-based garnet phosphors described in Section 2.2. 39,[128][129][130][131][132][133] The Mg 2+ -Si 4+ substitution involved the tetrahedral and octahedral sites, where the Ca 2+ -Si 4+ and Mn 2+ -Si 4+ substitution involves dodecahedral and tetrahedral sites in the garnet structure. This leads to the formation of solid-solution garnets and allows for a continuous variation of the local environment of Ce 3+ .…”

Section: Sites (Four-coordinated [Alo 4 ]mentioning

confidence: 99%

“…The modification of YAG:Ce 3+ or LuAG:Ce 3+ with the Ca 2+ -Si 4+ pair was inspired by naturally occurring mineral grossularite, Ca 3 Al 2 (SiO 4 ) 3 . 39,129 Kuru et al were the first to investigate the solubility of Ca 2+ and Si 4+ . 128 Later, Katelnikovas reported CaY 2 Al 4 SiO 12 :Ce 3+ and CaLu 2 Al 4-SiO 12 :Ce 3+ with a blue-shifted Ce 3+ emission in comparison to YAG:Ce and LuAG:Ce 3+ .…”

Section: Sites (Four-coordinated [Alo 4 ]mentioning

confidence: 99%

“…128 Later, Katelnikovas reported CaY 2 Al 4 SiO 12 :Ce 3+ and CaLu 2 Al 4-SiO 12 :Ce 3+ with a blue-shifted Ce 3+ emission in comparison to YAG:Ce and LuAG:Ce 3+ . 39,129 Similarly, incorporation of Mn 2+ -Si 4+ pairs into the aluminium garnets can be ascribed to the formation of solid solutions for the end members 132 Furthermore, this strategy can enhance the relative intensity of the red Mn 2+ component in the emission spectrum through Ce 3+ -Mn 2+ energy transfer. The emission spectra show that the incorporation of Mn 2+ in garnet-type Y 3 Al 5 O 12 gives rise to broadband yellow-orange Mn 2+ emission.…”

Section: Sites (Four-coordinated [Alo 4 ]mentioning

confidence: 99%

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Ce³⁺-Doped garnet phosphors: composition modification, luminescence properties and applications

2017

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Garnets have the general formula of ABCO and form a wide range of inorganic compounds, occurring both naturally (gemstones) and synthetically. Their physical and chemical properties are closely related to the structure and composition. In particular, Ce-doped garnet phosphors have a long history and are widely applied, ranging from flying spot cameras, lasers and phosphors in fluorescent tubes to more recent applications in white light LEDs, as afterglow materials and scintillators for medical imaging. Garnet phosphors are unique in their tunability of the luminescence properties through variations in the {A}, [B] and (C) cation sublattice. The flexibility in phosphor composition and the tunable luminescence properties rely on design and synthesis strategies for new garnet compositions with tailor-made luminescence properties. It is the aim of this review to discuss the variation in luminescence properties of Ce-doped garnet materials in relation to the applications. This review will provide insight into the relation between crystal chemistry and luminescence for the important class of Ce-doped garnet phosphors. It will summarize previous research on the structural design and optical properties of garnet phosphors and also discuss future research opportunities in this field.

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Section: Sites (Four-coordinated [Alo 4 ]mentioning

confidence: 99%

Section: Sites (Four-coordinated [Alo 4 ]mentioning

confidence: 99%

Section: Sites (Four-coordinated [Alo 4 ]mentioning

confidence: 99%

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Ce³⁺-Doped garnet phosphors: composition modification, luminescence properties and applications

2017

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“…23,24 Recently, garnet-structured metal oxides with the general formula of Li 6 MLa 2 N 2 O 12 (M = Ca, Sr, Ba; N = Ta, Sb, Nb) have been extensively studied as lithium-ion conductors because of their chemical and electrochemical stability. 23,24 Recently, garnet-structured metal oxides with the general formula of Li 6 MLa 2 N 2 O 12 (M = Ca, Sr, Ba; N = Ta, Sb, Nb) have been extensively studied as lithium-ion conductors because of their chemical and electrochemical stability.…”

Section: Introductionmentioning

confidence: 99%

Garnet-based Li₆CaLa₂Sb₂O₁₂:Eu³⁺red phosphors: a potential color-converting material for warm white light-emitting diodes

et al. 2015

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To alleviate the issues of low thermal stability and high correlated color temperature, exploring an inorganic color converter with both yellow-and red-emissions to replace the conventional resin/silicone-based phosphor converter for obtaining high-power warm white light-emitting diodes is highly desired. In this study, a series of garnet-based Li 6 CaLa 2À2x Eu 2x Sb 2 O 12 (x = 0.1-1.0) red phosphors have been successfully synthesized by a conventional high-temperature solid-state method. The microstructure and luminescence properties were systematically investigated by X-ray diffraction, emission/excitation spectra, luminescence lifetimes and temperature-dependent decays. The as-synthesized phosphors exhibited a highly efficient red luminescence at 611 nm corresponding to the 5 D 0 -7 F 2 electric dipole transition of Eu 3+ , and the luminescence monotonously enhanced as the Eu 3+ content was increased to 100 mol%. The absence of concentration quenching was ascribed to the large Eu 3+ -Eu 3+ distance (7.048-7.105 Å) and subsequently the hindering of unwanted energy migration among them in the Li 6 CaLa 2 Sb 2 O 12 crystalline lattice. Impressively, the Li 6 CaLaEuSb 2 O 12 phosphor showed an excellent thermal stability with only 9.7% emission loss when the recording temperature was increased from 293 K to 553 K. To evaluate the suitability of Li 6 CaLa 2 Sb 2 O 12 :Eu 3+ as a red converter, both the garnet-based Y 3 Al 5 O 12 :Ce 3+ yellow and Li 6 CaLa 2 Sb 2 O 12 :Eu 3+ red phosphor co-doped glass ceramics were successfully fabricated by a low-temperature co-sintering technique.Importantly, the adverse energy transfers between Ce 3+ and Eu 3+ were efficiently suppressed due to the spatial separation of Ce 3+ in Y 3 Al 5 O 12 and Eu 3+ in Li 6 CaLa 2 Sb 2 O 12 in the crystal lattice. As a consequence, the quantum yield of the glass ceramic reached as high as 89.3%, and the constructed white light-emitting diode exhibited an optimal luminous efficacy of 101 lm W À1 , a correlated color temperature of 5449 K and a color rendering index of 73.7. It is expected that the developed Li 6 CaLa 2À2x Eu 2x Sb 2 O 12 red phosphors and the related glass ceramics should have potential applications in high-power warm white light-emitting diodes.

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“…Recently, luminescent materials have been attracted a lot of attention due to their wide application in CRT, plasma display screens, sensors and solid‐state lighting (SSL) . White‐light SSL sources will ultimately replace incandescent and fluorescent lamps used for general illumination because of their high efficiency, energy saving, environmental friend, and long‐life time.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and luminescence of Eu³⁺ -activated molybdates with scheelite-type structure

Zhang

Meng

et al. 2013

Phys. Status Solidi A

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Scheelite‐type Eu3+‐activated molybdates [(Sr1−2xEuxLix)MoO4 and Sr0.40Eu0.40MoO4)] were prepared by the high temperature solid state reaction. The phase purity of the phosphors was characterized by XRD. The PL spectra, the fluorescence decay curves and the dependence of luminescence intensity on temperature were investigated in detail. The phosphors can be efficiently excited by near‐UV light to realize an intense red luminescence corresponding to the electric dipole transition of Eu3+ ions. The external quantum efficiency of (Sr0.2Eu0.4Li0.4)MoO4 sample under 395‐nm excitation is 0.73. According to the PL spectra, these phosphors could be candidate red‐emitting materials for solid‐state lighting if they are combined with green and blue efficiency phosphors and suitable near‐UV InGaN chip.

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Synthesis and optical properties of yellow emitting garnet phosphors for pcLEDs

Cited by 51 publications

References 17 publications

Ce³⁺-Doped garnet phosphors: composition modification, luminescence properties and applications

Ce³⁺-Doped garnet phosphors: composition modification, luminescence properties and applications

Garnet-based Li₆CaLa₂Sb₂O₁₂:Eu³⁺red phosphors: a potential color-converting material for warm white light-emitting diodes

Synthesis and luminescence of Eu³⁺ -activated molybdates with scheelite-type structure

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Synthesis and optical properties of yellow emitting garnet phosphors for pcLEDs

Cited by 51 publications

References 17 publications

Ce3+-Doped garnet phosphors: composition modification, luminescence properties and applications

Ce3+-Doped garnet phosphors: composition modification, luminescence properties and applications

Garnet-based Li6CaLa2Sb2O12:Eu3+red phosphors: a potential color-converting material for warm white light-emitting diodes

Synthesis and luminescence of Eu3+ -activated molybdates with scheelite-type structure

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Product

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Ce³⁺-Doped garnet phosphors: composition modification, luminescence properties and applications

Ce³⁺-Doped garnet phosphors: composition modification, luminescence properties and applications

Garnet-based Li₆CaLa₂Sb₂O₁₂:Eu³⁺red phosphors: a potential color-converting material for warm white light-emitting diodes

Synthesis and luminescence of Eu³⁺ -activated molybdates with scheelite-type structure