Ca[LiAl3N4]:Eu2+—A Narrow-Band Red-Emitting Nitridolithoaluminate

Pust, Philipp; Wochnik, Angela S.; Baumann, Elen; Schmidt, Peter J.; Wiechert, Detlef; Scheu, Christina; Schnick, Wolfgang

doi:10.1021/cm501162n

Cited by 202 publications

(159 citation statements)

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“…The excitation spectrum shows a maximum at 420 nm. 6,7,37,43 Similarly with [1], their highly condensed tetrahedra networks contain two different types of vierer ring channels. In Ba[Li 2 (Al 2 Si 2 )N 6 ], both types of the channels are filled with atoms: Ba 2+ occupying the larger channels, the smaller ones filled by Li + so that bisphenoids of Li 4 N 12 are built.…”

Section: Uv/vis Spectroscopymentioning

confidence: 99%

Narrow-Band Green Emitting Nitridolithoalumosilicate Ba[Li₂(Al₂Si₂)N₆]:Eu²⁺ with Framework Topology whj for LED/LCD-Backlighting Applications

et al. 2015

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Eu 2+ -as well as Ce 3+ -doped Ba[Li 2 (Al 2 Si 2 )N 6 ] and its related Mg-substituted compounds Ba[(Mg 2-x Li x )(Al 4-x Si x )N 6 ]:Eu 2+ (x = 0-2) with x = 1.6, 1.8 have been synthesized by metathesis reactions in tantalum ampules. Crystal structures were solved and refined from single-crystal X-ray diffraction data. All three compounds crystallize in tetragonal space group P4/ncc (no. 130) (Z = 4, Ba[Li 2 (Al 2 Si 2 )N 6 ]:Eu 2+ : a = 7.8282(4), c = 9.9557(5) Å, R1 = 0.0144, wR2 = 0.0366). Their crystal structures, exhibiting the novel framework topology whj, consist of a highly condensated anionic tetrahedra network of disordered (Li/Mg)N 4 and (Al/Si)N 4 units, connected to each other by common edges and corners. The degree of condensation (i.e. atomic ratio (Al,Li,Mg,Si):N) is κ = 1. The Ba 2+ -position is coordinated eightfold by N 3-in form of a truncated square pyramid. Upon doping with Eu 2+ narrow-band emission in the green to yellow spectral range is observed (λ em = 532 -562 nm, fwhm ∼1962 cm -1 ). Ce 3+ -doped crystals of Ba[Li 2 (Al 2 Si 2 )N 6 ] show blue emission (λ em = 468; 507 nm). According to the tunability of the narrow-band green emission, application in LED-backlight LCDs appears promising.

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Section: Uv/vis Spectroscopymentioning

confidence: 99%

Narrow-Band Green Emitting Nitridolithoalumosilicate Ba[Li₂(Al₂Si₂)N₆]:Eu²⁺ with Framework Topology whj for LED/LCD-Backlighting Applications

et al. 2015

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“…This idea has stimulated research on red phosphors activated by rare earths, with outstanding candidates being divalent europium-doped (oxy)nitrides. [10][11][12][13][14] However, besides economic considerations, the excitation of Eu 2+ can extend continuously to the green and even red spectral ranges due to the location of its 4f 7 → 4f 6 5d transitions, 1,[8][9][10][11][12][13][14] so that Eu 2+ doped (oxy)nitrides are not the most desirable phosphors for this purpose.…”

Section: Introductionmentioning

confidence: 99%

Site Occupancy Preference, Enhancement Mechanism, and Thermal Resistance of Mn⁴⁺ Red Luminescence in Sr₄Al₁₄O₂₅: Mn⁴⁺ for Warm WLEDs

et al. 2015

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Red phosphors play an indispensable role in phosphor-based warm white light emitting diodes (WLEDs). We demonstrated recently that the non-rare-earth phosphor Sr 4 Al 14 O 25 :Mn 4+ exhibits red luminescence even more intensely than the commercial Mn 4+ phosphor 3.5MgO.0.5MgF 2 .GeO 2 :Mn 4+ upon blue excitation. Herein, on the basis of crystal field calculations employing the exchange charge model, we identify the energy levels of three types of Mn 4+ ions situated at Al 3+ sites in the Sr 4 Al 14 O 25 crystal lattice and find that the doped manganese ions occupy preferentially the Al4 and Al5 more highly covalent sites rather than the Al6 site. We report that the Mn 4+ luminescence can be enhanced upon the inclusion of Mg 2+ in the synthesis reaction.The mechanisms for this effect comprise the lower nonradiative decay rate from the 2 E g state due to the reduction in energy migration along Mn 4+ ions to killer sites and also the morphology evolution from orderly layered smooth nanosheets to irregular nanoparticles disorderly compacted in porous bundles. Interestingly, various other phases are formed upon the addition of Mg 2+ . The resistance of Mn 4+ photoluminescence in the phosphor to thermal impact has also been studied and no obvious thermal degradation after a cycle experiment by heating and cooling the sample between 25 o C and 300 o C was found. As proof of concept, a warm perception WLED has been made when the phosphor was applied to the package of a blue LED chip and YAG:Ce.

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“…[6,7] and (Ca, Sr) LiAl 3 N 4 :Eu 2? [8,9]. Of course, there are some other red phosphors, such as Gd 2 GaTaO 7 :Eu 3?…”

Section: Introductionmentioning

confidence: 99%

Carbothermal synthesis of CaAlSiN3:Eu2+ red-emitting phosphors and the photoluminescent properties

Chen

Mao

et al. 2015

J Mater Sci: Mater Electron

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In this work, red-emitting nitride phosphor, CaAlSiN 3 :Eu 2? , was synthesized successfully by carbothermal method using CaH 2 , AlN, Si 3 N 4 , Eu 2 O 3 and graphite powder under the condition of atmospheric pressure with a moderate temperature of 1550°C for 6 h. In particular, graphite powder was employed as efficient and robust reducing agent in an optimal C/O mol ratio of 0.86. The obtained CaAlSiN 3 :Eu 2? phosphors were well crystallized and showed an intense red emission band with peaks in the range of 642-675 nm dependent on the Eu 2? doping concentration. Excellent thermal stability for as-synthesized Ca 1-x AlSiN 3 :xEu 2? (x = 0.02-0.10) phosphors with absolute quantum efficiency about 20 % were demonstrated. These results presented here indicated the promising prospect for this economic and facile carbothermal synthesis route in preparing CaAlSiN 3 :Eu 2? phosphors , and the phosphors are highly promising candidates for warm white LEDs.

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Ca[LiAl₃N₄]:Eu²⁺—A Narrow-Band Red-Emitting Nitridolithoaluminate

Cited by 202 publications

References 42 publications

Narrow-Band Green Emitting Nitridolithoalumosilicate Ba[Li₂(Al₂Si₂)N₆]:Eu²⁺ with Framework Topology whj for LED/LCD-Backlighting Applications

Narrow-Band Green Emitting Nitridolithoalumosilicate Ba[Li₂(Al₂Si₂)N₆]:Eu²⁺ with Framework Topology whj for LED/LCD-Backlighting Applications

Site Occupancy Preference, Enhancement Mechanism, and Thermal Resistance of Mn⁴⁺ Red Luminescence in Sr₄Al₁₄O₂₅: Mn⁴⁺ for Warm WLEDs

Carbothermal synthesis of CaAlSiN3:Eu2+ red-emitting phosphors and the photoluminescent properties

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Ca[LiAl3N4]:Eu2+—A Narrow-Band Red-Emitting Nitridolithoaluminate

Cited by 202 publications

References 42 publications

Narrow-Band Green Emitting Nitridolithoalumosilicate Ba[Li2(Al2Si2)N6]:Eu2+ with Framework Topology whj for LED/LCD-Backlighting Applications

Narrow-Band Green Emitting Nitridolithoalumosilicate Ba[Li2(Al2Si2)N6]:Eu2+ with Framework Topology whj for LED/LCD-Backlighting Applications

Site Occupancy Preference, Enhancement Mechanism, and Thermal Resistance of Mn4+ Red Luminescence in Sr4Al14O25: Mn4+ for Warm WLEDs

Carbothermal synthesis of CaAlSiN3:Eu2+ red-emitting phosphors and the photoluminescent properties

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Ca[LiAl₃N₄]:Eu²⁺—A Narrow-Band Red-Emitting Nitridolithoaluminate

Narrow-Band Green Emitting Nitridolithoalumosilicate Ba[Li₂(Al₂Si₂)N₆]:Eu²⁺ with Framework Topology whj for LED/LCD-Backlighting Applications

Narrow-Band Green Emitting Nitridolithoalumosilicate Ba[Li₂(Al₂Si₂)N₆]:Eu²⁺ with Framework Topology whj for LED/LCD-Backlighting Applications

Site Occupancy Preference, Enhancement Mechanism, and Thermal Resistance of Mn⁴⁺ Red Luminescence in Sr₄Al₁₄O₂₅: Mn⁴⁺ for Warm WLEDs