Luminescence and luminescence quenching of efficient GdB5O9:Eu3+ red phosphors

Kruopyte, Aiste; Giraitis, Raimondas; Juškėnas, Remigijus; Enseling, David; Jüstel, Thomas; Katelnikovas, Artūras

doi:10.1016/j.jlumin.2017.07.038

Cited by 19 publications

(7 citation statements)

References 21 publications

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“…The intensity of 5 D 0 → 7 F 4 transition usually is very low in Eu 3+ doped phosphors and there are very few examples reported in the literature where this transition dominates the emission spectra. Some of these matrices are garnet structure compounds: Y 3 (Al,Ga) 5 O 12 :Eu 3+ [35]; orthophosphates: (Lu,Y,Gd,La)PO 4 :Eu 3+ [35], BiPO 4 :Eu 3+ [36]; borates: GdB 5 O 9 :Eu 3+ [37]; molybdates: Eu 2 Mo 4 O 15 [38], silicates: Na 2 ZnSiO 4 :Eu 3+ [39], Ca 2 Ga 2 SiO 7 :Eu 3+ [40]; aluminates: GdSr 2 AlO 5 :Eu 3+ [41]; niobates: K 2 LaNb 5 O 15 :Eu 3+ [42]; and even exotic uranyl phosphates: (Y,Eu,La)(UO 2 ) 3 (PO 4 ) 2 O(OH)·6H 2 O [43]. The inset in Figure 3b shows integrated emission intensity as a function of Eu 3+ concentration.…”

Section: Resultsmentioning

confidence: 99%

Optical Properties of Red-Emitting Rb2Bi(PO4)(MoO4):Eu3+ Powders and Ceramics with High Quantum Efficiency for White LEDs

et al. 2019

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There are several key requirements that a very good LED phosphor should meet, i.e., strong absorption, high quantum efficiency, high colour purity, and high luminescence quenching temperature. The reported Rb2Bi(PO4)(MoO4):Eu3+ phosphors have all these properties. The Rb2Bi(PO4)(MoO4):Eu3+ phosphors emit bright red light if excited with near-UV radiation. The calculated colour coordinates show good stability in the 77–500 K temperature range. Moreover, sample doped with 50% Eu3+ possesses quantum efficiency close to unity. Besides the powder samples, ceramic disks of Rb2Eu(PO4)(MoO4) specimen were also prepared, and the red light sources from these disks in combination with near-UV emitting LED were fabricated. The obtained results indicated that ceramic disks efficiently absorb the emission of 375 and 400 nm LED and could be applied as a red component in phosphor-converted white LEDs.

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Section: Resultsmentioning

confidence: 99%

Optical Properties of Red-Emitting Rb2Bi(PO4)(MoO4):Eu3+ Powders and Ceramics with High Quantum Efficiency for White LEDs

et al. 2019

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“…This originates from the fact that Eu 3+ can occupy four lattice sites with each giving lines at slightly different wavelengths due to the different crystal field generated. This is the opposite to phosphors where only one lattice site is available for Eu 3+ ions and there are very few excitation lines which, in turn, are also very narrow [13,[26][27][28][29]. The absorption strength of the synthesized phosphors increased with increasing Eu 3+ concentration.…”

Section: Resultsmentioning

confidence: 81%

Temperature-Dependent Luminescence of Red-Emitting Ba2Y5B5O17: Eu3+ Phosphors with Efficiencies Close to Unity for Near-UV LEDs

et al. 2020

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Solid state white light sources based on a near-UV LED chip are gaining more and more attention. This is due to the increasing efficiency of near-UV-emitting LED chips and wider phosphors selection if compared to devices based on blue LED chips. Here, a brief overview is given of the concepts of generating white light employing near-UV LED and some optical properties of the available phosphors are discussed. Finally, the synthesis and optical properties of very efficient red-emitting Ba2Y5B5O17:Eu3+ phosphor powder and ceramics is reported and discussed in terms of possible application as a red component in near-UV LED-based white light sources.

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“…The most intense bands occur at 915 cm −1 resulting from the ν1 mode. The symmetric stretching mode (ν1) of BO 3 3− group is a strong Raman active vibration as known from other Pr 3+ -containing orthoborates such as λ-PrBO 3 [37,43,44] and KCaPr(BO 3 ) 2 [45]. Above 1000 cm −1 , one peak locating at 1050 cm −1 and several border bands are found and can be ascribed to the ν3 mode of BO (Fig.…”

Section: Ftir and Raman Spectramentioning

confidence: 71%

“…Inorganic rare-earth borates have received intensive interests owing to their wide range of applications in nonlinear optics (NLO), laser hosts and photoluminescence materials [1][2][3]. Among the most attractive features of borate crystals, the key characteristics are their transparency in the wide range from mid-infrared to deep-ultraviolet [4], high optical damage threshold [5] and suitable physico-chemical stability [6].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of K2Pr2O(BO3)2: structural, spectroscopic and thermogravimetric investigations of a novel potassium praseodymium oxoborate structure-type

2020

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Single crystal and polycrystalline powder samples of a new potassium praseodymium oxoborate K 2 Pr 2 O(BO 3) 2 were prepared by high-temperature solid-state methods. The crystal structure obtained from single-crystal X-ray diffraction data was confirmed by powder X-ray data Rietveld refinement (P2 1 /c, a = 1135.00(3) pm, b = 660.64(2) pm, c = 1072.03(3) pm, β = 117.128(2)°, V = 715.41(3) × 10 6 pm 3). The bond-valence sum of the central cation for KO 6/7 , PrO 9 and BO 3 coordination lies close to the respective empirical value. Both Fourier-transform infrared and Raman spectroscopy demonstrated the vibrational features of the isolated BO 3 planar group. The diffuse UV/Vis reflectance spectra showed fundamental absorption edge at 4.49(1) eV obtained from the combined approach using Tauc and derivation of absorption spectrum fitting methods. The greenish color of the sample was identified originating from 4f-4f-electron transitions. The thermal stability was investigated by using simultaneous thermogravimetric analysis and differential scanning calorimetry. The decomposed products Pr 26 O 27 (BO 3) 8 (90(2) wt%) and Pr 6 O 11 (10(2) wt%) were confirmed by powder X-ray diffraction data analysis, complementary to the weight-loss during the heating process. Since Pr 3+ cation is known to show interesting photoluminescence property, this novel compound may be a prospective candidate as phosphor.

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Luminescence and luminescence quenching of efficient GdB5O9:Eu3+ red phosphors

Cited by 19 publications

References 21 publications

Optical Properties of Red-Emitting Rb2Bi(PO4)(MoO4):Eu3+ Powders and Ceramics with High Quantum Efficiency for White LEDs

Optical Properties of Red-Emitting Rb2Bi(PO4)(MoO4):Eu3+ Powders and Ceramics with High Quantum Efficiency for White LEDs

Temperature-Dependent Luminescence of Red-Emitting Ba2Y5B5O17: Eu3+ Phosphors with Efficiencies Close to Unity for Near-UV LEDs

Synthesis and characterization of K2Pr2O(BO3)2: structural, spectroscopic and thermogravimetric investigations of a novel potassium praseodymium oxoborate structure-type

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