Fluorescence properties of polycrystalline Tm3+-activated Y3Al5O12 and Tm3+-Li+ co-activated Y3Al5O12 in the visible and near IR ranges

Lopez, O. A.; McKittrick, Joanna; Shea, L. E.

doi:10.1016/s0022-2313(96)00123-8

Cited by 284 publications

(151 citation statements)

References 35 publications

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“…[34] However, excess oxygen vacancies in the host would inevitably destroy the crystallinity, which leads to quenching of the luminescence. [35] Of course, the more important reason is that more Eu 3+ entered the lattice, which can enhance the luminescence of the samples greatly, which will be proved by Fig. 4.…”

Section: Occupation Of LImentioning

confidence: 83%

Eu³⁺ (orange/red) luminescence in LiXSO₄Cl (X = Mg, Zn) halosulfate phosphor

Nagpure¹,

Dhoble²,

Pode

2009

Luminescence

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Section: Occupation Of LImentioning

confidence: 83%

Eu³⁺ (orange/red) luminescence in LiXSO₄Cl (X = Mg, Zn) halosulfate phosphor

Nagpure¹,

Dhoble²,

Pode

2009

Luminescence

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“…The occupation of Dy 3+ ion into Ca 2+ sites in KCa 4 (BO 3 ) 3 host eventually generates number of oxygen vacant sites, thereby lead to expand the lattice and lower the crystal density. According to Lopez et al, 41 oxygen vacancies might be useful to enhance the rare-earth ion emission by acting as sensitizers for efficient energy transfer from charge transfer states to the rare earth ions. However, the crystallinity of the host would be inevitably destroyed by these excess oxygen vacancies, which may eventually lead to quenching of rare earth ion emission.…”

Section: A Xrd and Sem Studiesmentioning

confidence: 99%

KCa4(BO3)3:Ln3+ (Ln = Dy, Eu, Tb) phosphors for near UV excited white–light–emitting diodes

et al. 2013

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A series of doped KCa 4 (BO 3 ) 3 :Ln 3+ (Ln: Dy, Eu and Tb) compositions were synthesized by solid-state reaction method and their photoluminescent properties were systematically investigated to ascertain their suitability for application in white light emitting diodes. The X-ray diffraction (XRD) and nuclear magnetic resonance (MAS-NMR) data indicates that Ln 3+ -ions are successfully occupied the noncentrosymmetric Ca 2+ sites, in the orthorhombic crystalline phase of KCa 4 (BO 3 ) 3 having space group Ama2, without affecting the boron chemical environment. The present phosphor systems could be efficiently excitable at the broad UV wavelength region, from 250 to 350 nm, compatible to the most commonly available UV light-emitting diode (LED) chips. Photoluminescence studies revealed optimal near white-light emission for KCa 4 (BO 3 ) 3 with 5 wt.% Dy 3+ doping, while warm white-light (CIE; X = 0.353, Y = 0.369) is obtained at 1wt.% Dy 3+ ion concentration. The principle of energy transfer between Eu 3+ and Tb 3+ also demonstrates the potential white-light from KCa 4 (BO 3 ) 3 :Eu 3+ ,Tb 3+ phosphor. Whereas, single Tb 3+ and Eu 3+ -doped systems showed bright green (Tb 3+ ) and red (Eu 3+ ) emissions, respectively. Having structural flexibility along with remarkable chemical/thermal stability and suitable quantum efficiency these phosphors can be promising candidates as white-light-emitter for near UV LEDs.

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“…When properly activated with luminescent centers, the REAG compounds are important inorganic phosphors (such as YAG:Ce), which find applications in cathode ray tubes (CRTs), field emission displays (FEDs), vacuum fluorescent displays, scintillators, electroluminescent materials and so forth [3][4][5][6][7], owing to their high chemical and radiation stabilities, wide bandgap and excellent radiation conversion efficiency. YAG:Tb is a green phosphor used in FEDs [8][9][10][11], while Ce 3+ -activated YAG and LuAG yellow phosphors combined with blue light-emitting diodes (LEDs) are efficient white-light sources [12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Effective lattice stabilization of gadolinium aluminate garnet (GdAG) via Lu³⁺doping and development of highly efficient (Gd,Lu)AG:Eu³⁺red phosphors

Zhang

et al. 2012

Science and Technology of Advanced Materials

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The metastable garnet lattice of Gd 3 Al 5 O 12 is stabilized by doping with smaller Lu 3+ , which then allows an effective incorporation of larger Eu 3+ activators. The [(Gd 1−x Lu x ) 1−y Eu y ] 3 Al 5 O 12 (x = 0.1-0.5, y = 0.01-0.09) garnet solid solutions, calcined from their precursors synthesized via carbonate coprecipitation, exhibit strong luminescence at 591 nm (the 5 D 0 → 7 F 1 magnetic dipole transition of Eu 3+ ) upon UV excitation into the charge transfer band (CTB) at ∼239 nm, with CIE chromaticity coordinates of x = 0.620 and y = 0.380 (orange-red). The quenching concentration of Eu 3+ was estimated at ∼5 at.% (y = 0.05), and the quenching was attributed to exchange interactions. Partial replacement of Gd 3+ with Lu 3+ up to 50 at.% (x = 0.5) while keeping Eu 3+ at the optimal content of 5 at.% does not significantly alter the peak positions of the CTB and 5 D 0 → 7 F 1 emission bands but slightly weakens both bands owing to the higher electronegativity of Lu 3+ . The effects of processing temperature (1000-1500• C) and Lu/Eu contents on the intensity, quantum efficiency, lifetime and asymmetry factor of luminescence were thoroughly investigated. The [(Gd 0.7 Lu 0.3 ) 0.95 Eu 0.05 ] 3 Al 5 O 12 phosphor processed at 1500• C exhibits a high internal quantum efficiency of ∼83.2% under 239 nm excitation, which, in combination with the high theoretical density, favors its use as a new type of photoluminescent and scintillation material.

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Fluorescence properties of polycrystalline Tm3+-activated Y3Al5O12 and Tm3+-Li+ co-activated Y3Al5O12 in the visible and near IR ranges

Cited by 284 publications

References 35 publications

Eu³⁺ (orange/red) luminescence in LiXSO₄Cl (X = Mg, Zn) halosulfate phosphor

Eu³⁺ (orange/red) luminescence in LiXSO₄Cl (X = Mg, Zn) halosulfate phosphor

KCa4(BO3)3:Ln3+ (Ln = Dy, Eu, Tb) phosphors for near UV excited white–light–emitting diodes

Effective lattice stabilization of gadolinium aluminate garnet (GdAG) via Lu³⁺doping and development of highly efficient (Gd,Lu)AG:Eu³⁺red phosphors

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Fluorescence properties of polycrystalline Tm3+-activated Y3Al5O12 and Tm3+-Li+ co-activated Y3Al5O12 in the visible and near IR ranges

Cited by 284 publications

References 35 publications

Eu3+ (orange/red) luminescence in LiXSO4Cl (X = Mg, Zn) halosulfate phosphor

Eu3+ (orange/red) luminescence in LiXSO4Cl (X = Mg, Zn) halosulfate phosphor

KCa4(BO3)3:Ln3+ (Ln = Dy, Eu, Tb) phosphors for near UV excited white–light–emitting diodes

Effective lattice stabilization of gadolinium aluminate garnet (GdAG) via Lu3+doping and development of highly efficient (Gd,Lu)AG:Eu3+red phosphors

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Eu³⁺ (orange/red) luminescence in LiXSO₄Cl (X = Mg, Zn) halosulfate phosphor

Eu³⁺ (orange/red) luminescence in LiXSO₄Cl (X = Mg, Zn) halosulfate phosphor

Effective lattice stabilization of gadolinium aluminate garnet (GdAG) via Lu³⁺doping and development of highly efficient (Gd,Lu)AG:Eu³⁺red phosphors