Luminescence and luminescence quenching of highly efficient Y2Mo4O15:Eu3+ phosphors and ceramics

Janulevicius, Matas; Marmokas, Paulius; Misevicius, Martynas; Grigorjevaite, Julija; Mikoliūnaitė, Lina; Šakirzanovas, Simas; Katelnikovas, Artūras

doi:10.1038/srep26098

Cited by 128 publications

(47 citation statements)

References 42 publications

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“…Thus, colour tunability could be achieved by changing the doping concentration. It is evident from the obtained CCT, CRI and LER values as given in Table , that Dy 3+ ion‐doped ZnO nanofibres calcined at 300°C seem to be good candidates for warm white light LED devices …”

Section: Resultsmentioning

confidence: 84%

Enhanced photoluminescence properties of electrospun Dy³⁺‐doped ZnO nanofibres for white lighting devices

2018

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Dy -doped ZnO nanofibres with diameters from 200 to 500 nm were made using an electrospinning technique. The as-fabricated amorphous nanofibres resulted in good crystalline continuous nanofibres through calcination. Dy -doped ZnO nanofibres were characterized using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), ultraviolet-visible (UV-vis) light spectroscopy, Fourier transform infrared spectroscopy (FTIR), and photoluminescence (PL). XRD showed the well defined peaks of ZnO. UV-vis spectra showed a good absorption band at 360 nm. FTIR spectra showed a Zn-O stretching vibration confirming the presence of ZnO. Photoluminescence spectra of Dy -doped ZnO nanofibres showed an emission peak in the visible region that was free from any ZnO defect emission. Emissions at 480 nm and 575 nm in the Dy -doped ZnO nanofibres were the characteristic peaks of dopant Dy and implied efficient energy transfer from host to dopant. Luminescence intensity was found to be increased with increasing doping concentration and reduction in nanofibre diameter. Colour coordinates were calculated from photometric characterizations, which resembled the properties for warm white lighting devices.

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Section: Resultsmentioning

confidence: 84%

Enhanced photoluminescence properties of electrospun Dy³⁺‐doped ZnO nanofibres for white lighting devices

2018

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“…In comparison, the Eu 3+ ion, as an obbligato member of RE ions, is most frequently used as a red-emitting activator since its narrow red emission originating from 5 D 0 → 7 F 2 transition 23,24 . Up to date, some Eu 3+ -activated red-emitting phosphors, such as Li 3 Ba 2 Y 3 (WO 4 ) 8 :Eu 3+ , Ca 2 Ga 2 SiO 7 :Eu 3+ and Y 2 Mo 4 O 15 :Eu 3+ , were successfully synthesized 25–27 . However, these red-emitting phosphors suffer from narrow excitation bands and do not match well with the emitting band of NUV or blue LED chip which limits their promising applications in WLEDs.…”

Section: Introductionmentioning

confidence: 99%

Eu3+-activated La2MoO6-La2WO6 red-emitting phosphors with ultrabroad excitation band for white light-emitting diodes

2017

Sci Rep

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A series of novel Eu3+ -activated La 2 MoO 6 -La 2 WO 6 red-emitting phosphors have been successfully prepared by a citrate-assisted sol-gel process. Both photoluminescence excitation and emission spectra suggest that the resultant products have the strong ultrabroad absorption band ranging from 220 to 450 nm. Under the excitation of 379 nm, the characteristic emissions of Eu 3+ ions corresponding to the 5 D 0 → 7 F J transitions are observed in the doped samples. The optimal doping concentration for Eu 3+ions is found to be 12 mol% and the quenching mechanism is attributed to the dipole-dipole interaction. A theoretical calculation based on the Judd-Ofelt theory is carried out to explore the local structure environment around the Eu 3+ ions. The studied samples exhibit a typical thermal quenching effect with a T 0.5 value of 338 K and the activation energy is determined to be 0.427 eV. A near-ultraviolet (NUV)-based white light-emitting diode (LED) is packaged by integrating a mixture of resultant phosphors, commercial blue-emitting and green-emitting phosphors into an NUV LED chip. The fabricated LED device emits glaring white light with high color rendering index (84.6) and proper correlated color temperature (6492 K). These results demonstrate that the Eu 3+ -activated La 2 MoO 6 -La 2 WO 6 compounds are a promising candidate for indoor lighting as red-emitting phosphors.By virtue of admirable advantages of long working lifetime, energy saving, low cost, high luminous efficiency and environmental compatibility, the phosphor-converted white light-emitting diodes (WLEDs) which are considered as the next-generation illumination sources to supersede the conventional fluorescent lamps have been extensively used in indoor lighting, automobile displays and flashlights [1][2][3][4][5] . Presently, the commercial WLEDs which are made up of a blue-emitting InGaN LED chip and Y 3 Al 5 O 12 :Ce 3+ yellow-emitting phosphors suffer from poor color rending index (CRI ~ 70-80) and high correlated color temperature (CCT ~ 7000 K) as a result of inefficient red emission component [6][7][8] . To circumvent these drawbacks, a new strategy utilizing the near-ultraviolet (NUV) LED chip to pump the hybrid tricolor (blue, green and red) phosphors is performed to emit warm white light [9][10][11] . From the aforementioned combinations, one knows that the eventual behaviors of WLED devices can be significantly affected by the phosphors and they are expected to be efficiently excited by NUV or blue light. In comparison with commercial blue-emitting and green-emitting phosphors, the current red-emitting phosphors, by taking Y 2 O 2 S:Eu 3+ for example, still exhibit some unsatisfied characteristics such as weak absorption in the NUV/blue region, low luminous efficiency and poor stability 12,13 . In order to improve the performance of red-emitting phosphors, the nitride-and germanide-based red-emitting phosphors, such as Ca 2 Si 5 N 8 :Eu 2+ , Sr[LiAl 3 N 4 ]:Eu

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“…Trivalent rare earth (RE 3+ ) ions are excellent emission centres and have been widely used in multicolor phosphors . However, sensitization processes such as energy transfer from RE‐O charge transfer, host matrix absorption, or other sensitizing ions, are commonly required to overcome the low absorption cross‐section via the parity forbidden intra f – f transition of RE 3+ ions .…”

Section: Introductionmentioning

confidence: 99%

Enhanced red emission from BaMoO₄: Eu³⁺ by Bi³⁺ co‐doping

et al. 2017

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A series of Bi ,Eu -doped BaMoO phosphors was synthesized using a hydrothermal method. The crystal structure, morphology and optical properties of the phosphors were studied using X-ray diffraction (XRD), scanning electron microscope (SEM) and photoluminescence (PL) measurements. Three different particle morphologies were detected in the SEM observation. The energy dispersive spectroscopy (EDS) results indicated that the solubility of Bi in spherical or rugby-like BaMoO particles was very low and the excess Bi element was cumulated in the irregular particles. Characteristic emissions of Eu ions ( D → F ; J = 0, 1, 2, 3, 4) were observed under excitation in ultraviolet (UV) light, with the most intense transition being the D → F transition. Energy transfer from MoO and Bi to Eu can be readily achieved. Red emission intensity of Eu was enhanced by a factor of two by co-doping with a small amount of Bi . Optical properties as a function of Bi content were studied and the optimum Bi content in BaMoO nanocrystals was determined to be 0.4 mol%.

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Luminescence and luminescence quenching of highly efficient Y2Mo4O15:Eu3+ phosphors and ceramics

Cited by 128 publications

References 42 publications

Enhanced photoluminescence properties of electrospun Dy³⁺‐doped ZnO nanofibres for white lighting devices

Enhanced photoluminescence properties of electrospun Dy³⁺‐doped ZnO nanofibres for white lighting devices

Eu3+-activated La2MoO6-La2WO6 red-emitting phosphors with ultrabroad excitation band for white light-emitting diodes

Enhanced red emission from BaMoO₄: Eu³⁺ by Bi³⁺ co‐doping

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Luminescence and luminescence quenching of highly efficient Y2Mo4O15:Eu3+ phosphors and ceramics

Cited by 128 publications

References 42 publications

Enhanced photoluminescence properties of electrospun Dy3+‐doped ZnO nanofibres for white lighting devices

Enhanced photoluminescence properties of electrospun Dy3+‐doped ZnO nanofibres for white lighting devices

Eu3+-activated La2MoO6-La2WO6 red-emitting phosphors with ultrabroad excitation band for white light-emitting diodes

Enhanced red emission from BaMoO4: Eu3+ by Bi3+ co‐doping

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Enhanced photoluminescence properties of electrospun Dy³⁺‐doped ZnO nanofibres for white lighting devices

Enhanced photoluminescence properties of electrospun Dy³⁺‐doped ZnO nanofibres for white lighting devices

Enhanced red emission from BaMoO₄: Eu³⁺ by Bi³⁺ co‐doping