Highly enterprising calcium zirconium phosphate [CaZr4(PO4)6:Dy3+, Ce3+] phosphor for white light emission

Nair, Govind B.

doi:10.1039/c5ra07306e

Cited by 100 publications

(40 citation statements)

References 45 publications

(40 reference statements)

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“…From Figure , a spectral overlap between the emission spectrum of Ce 3+ and the excitation spectrum of Tb 3+ can be seen. The prime condition for the energy transfer to take place is that there should be a spectral overlap between the emission and excitation spectra of sensitizers and activators, respectively . The Ce 3+ ions when excited by 279 nm emits in the broad band ranging from 300 to 400 nm, which is the excitation region for Tb 3+ ions as shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

Green‐light emission through energy transfer from Ce³⁺ to Tb³⁺ ions in the Li₂SO₄–Al₂(SO₄)₃ system

2019

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An energy transfer process from Ce3+ to Tb3+ ions was successfully achieved in a Li2SO4–Al2(SO4)3 mixed‐sulphate system. A wet‐chemical synthesis was employed to prepare the Li2SO4–Al2(SO4)3 system by doping Ce3+ and Tb3+ ions individually as well as collectively. The phases were identified using X‐ray diffraction studies. The as‐prepared samples were characterized by FT‐IR and photoluminescence measurements. Green‐light emission was exhibited by Ce3+, Tb3+ co‐doped Li2SO4–Al2(SO4)3 system, thus, indicating its potential as a material for display devices or in the lamp industry.

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Section: Resultsmentioning

confidence: 99%

Green‐light emission through energy transfer from Ce³⁺ to Tb³⁺ ions in the Li₂SO₄–Al₂(SO₄)₃ system

2019

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“…This finding implies that Dy 3+ ions occupy more non‐central symmetrical sites in Sr 1.925–1.5y P 2 O 7 :0.05Dy 3+ ,yCe 3+ phosphors. Co‐doping of Ce 3+ ion is responsible for changes in local sites around the Dy 3+ ion from higher to lower symmetry, under 307 nm UV excitation …”

Section: Resultsmentioning

confidence: 99%

The luminescence properties of Sr_{2–1.5x−1.5y}P₂O₇:xDy³⁺,yCe³⁺ phosphor for near‐UV‐based white LEDs synthesized by a chemical co‐precipitation method

Zhu

Wang

et al. 2017

Luminescence

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A series of Sr P O :Dy , Sr P O :Ce and Sr P O :Dy ,Ce phosphors was synthesized via the one-step calcination process for the precursors prepared by co-precipitation methods. The phases, morphology, quantum efficiency and photoluminescence properties of the obtained phosphors were characterized systematically. These results show that the near-spherical particles prepared through calcining the precursors by means of ammonium dibasic phosphate co-precipitation (method 3) have the smallest particle size and strongest emission intensity among the three methods in the paper. With Dy concentration increasing in Sr P O :Dy phosphors, the luminescence intensity first increases, reaches maximum, and then decreases. A similar trend was followed by Sr P O :Ce with Ce concentration increasing. A successful attempt was made to initiate the energy transfer mechanism from Ce to Dy in the host lattice and an overlap between the emission band of Ce and the excitation band of Dy indicated that the Ce → Dy energy transfer may indeed exist. It is clear that the photoluminescence intensity of Dy as well as the quantum efficiency of the phosphor can be enhanced markedly by co-doping Ce . Sr P O :Dy ,Ce has its (CIE) chromaticity coordinates in the bluish-white-light region, near the standard illuminant D . The CIE 1913 chromaticity coordinates of Sr P O :Dy phosphors fall in the white-light region, and are adjacent to the ideal white-light coordinates. In addition, the colour temperature and colour tone of Sr P O :Dy could be adjusted by changing the relative concentration of Dy . In short, Sr P O :Dy can be a promising single-phased white-light emitting phosphor for near-UV (NUV) w-LEDs.

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“…Taking a point on the initial rise side of an isolated TL peak, a tangent is drawn at the point ( N ≡ Ic, Tc) (Figure ) and the slope was calculated. It is assumed that I(T) has the form (initial rise region):

normalI ((),, t) = normalc exp ((),, - normalE true/ kT)

where, c is the constant.…”

Section: Resultsmentioning

confidence: 99%

Photoluminescence and thermoluminescence of K₂Mg(SO₄)₂:Eu and evaluation of its kinetic parameters

Deshpande

Dhoble

Gedam³

et al. 2016

Luminescence

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The K Mg(SO ) :Eu phosphor, synthesized by a solid-state diffusion method, was studied for its photoluminescence (PL) and thermoluminescence (TL) characteristics. The X-ray diffraction (XRD) pattern of the material was matched with the standard JCPDF No. 36-1499. For PL characteristics, K Mg(SO ) :Eu showed an emission peak at 474 nm when excited at 340 nm, while it showed Eu emission at 580 nm, and 594 nm splitting at 613 nm and 618 nm for an excitation of 396 nm wavelength due to radiative transitions from D to F (j = 0, 1, 2, 3). The Commission International de I' Eclairage (CIE) chromaticity coordinates were also calculated for the K Mg(SO ) :Eu phosphor, and were close to the NTSC standard values. For the TL study, the prepared sample was irradiated using a Co source of γ-irradiation at the dose rate of 0.322 kGy/h for 2 min. The formation of traps in K Mg (SO ) :Eu and the effects of γ-radiation dose on the glow curve are discussed. Well defined broad glow peaks were obtained at 186°C. With increasing γ-ray dose, the sample showed linearity in intensity. The presence of a single glow peak indicated that there was only one set of traps being activated within the particular temperature range. The presented phosphors were also studied for their fading, reusability and trapping parameters. There was just 2% fading during a period of 30 days, indicating no serious fading problem. Kinetic parameters were calculated using the initial rise method and Chen's half-width method. Activation energy and frequency factor were found to be 0.77 eV and 1.41 × 10 sec .

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Highly enterprising calcium zirconium phosphate [CaZr₄(PO₄)₆:Dy³⁺, Ce³⁺] phosphor for white light emission

Abstract: A series of CaZr4(PO4)6:Dy3+, CaZr4(PO4)6:Ce3+ and CaZr4(PO4)6:Dy3+, Ce3+ phosphors were prepared by the solid state reaction process.

Cited by 100 publications

References 45 publications

Green‐light emission through energy transfer from Ce³⁺ to Tb³⁺ ions in the Li₂SO₄–Al₂(SO₄)₃ system

Green‐light emission through energy transfer from Ce³⁺ to Tb³⁺ ions in the Li₂SO₄–Al₂(SO₄)₃ system

The luminescence properties of Sr_{2–1.5x−1.5y}P₂O₇:xDy³⁺,yCe³⁺ phosphor for near‐UV‐based white LEDs synthesized by a chemical co‐precipitation method

Photoluminescence and thermoluminescence of K₂Mg(SO₄)₂:Eu and evaluation of its kinetic parameters

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Highly enterprising calcium zirconium phosphate [CaZr4(PO4)6:Dy3+, Ce3+] phosphor for white light emission

Abstract: A series of CaZr4(PO4)6:Dy3+, CaZr4(PO4)6:Ce3+ and CaZr4(PO4)6:Dy3+, Ce3+ phosphors were prepared by the solid state reaction process.

Cited by 100 publications

References 45 publications

Green‐light emission through energy transfer from Ce3+ to Tb3+ ions in the Li2SO4–Al2(SO4)3 system

Green‐light emission through energy transfer from Ce3+ to Tb3+ ions in the Li2SO4–Al2(SO4)3 system

The luminescence properties of Sr2–1.5x−1.5yP2O7:xDy3+,yCe3+ phosphor for near‐UV‐based white LEDs synthesized by a chemical co‐precipitation method

Photoluminescence and thermoluminescence of K2Mg(SO4)2:Eu and evaluation of its kinetic parameters

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Highly enterprising calcium zirconium phosphate [CaZr₄(PO₄)₆:Dy³⁺, Ce³⁺] phosphor for white light emission

Green‐light emission through energy transfer from Ce³⁺ to Tb³⁺ ions in the Li₂SO₄–Al₂(SO₄)₃ system

Green‐light emission through energy transfer from Ce³⁺ to Tb³⁺ ions in the Li₂SO₄–Al₂(SO₄)₃ system

The luminescence properties of Sr_{2–1.5x−1.5y}P₂O₇:xDy³⁺,yCe³⁺ phosphor for near‐UV‐based white LEDs synthesized by a chemical co‐precipitation method

Photoluminescence and thermoluminescence of K₂Mg(SO₄)₂:Eu and evaluation of its kinetic parameters