Energy transfer between Ce3+ → Gd3+ or Tb3+ in KNaSO4 microphosphor

Manik, Urvashi; Gedam, S.C.; Dhoble, S.J.

doi:10.1002/bio.2953

Cited by 4 publications

(3 citation statements)

References 27 publications

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“…From previous results, it is known that white light obtained through mixing several monochromatic lights could achieve more ideal effects than that obtained only by a broad emission band. Many researchers have pointed out that the more numbers the simplex lights have, the higher was the color rendering index of the artificial light . In short, Ba 2 P 2 O 7 :0.01Eu 2+ ,0.008Ce 3+ ,zTb 3+ phosphor may approach the desired luminescence property needed for white LED application.…”

Section: Resultsmentioning

confidence: 99%

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Luminescent properties of single‐phase Ba_{2‐x‐1.5y‐1.5z}P₂O₇:xEu²⁺,yCe³⁺, zTb³⁺ phosphors for white light‐emitting diode

et al. 2017

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Abstractpoor color rendering index and low stability of CCT. [1,4] Given that issue, it is necessary to explore single-phase white emissive phosphors for application in w-LEDs.Numerous efforts have previously been made to develop codoped single-phase white-emitting phosphors. [5,6] However, with the tri-doped phosphor it is easier to achieve tri-chromatic (RGB) emission with complete coverage when compared with co-doped phosphors. It is well known that the mixture of RGB emissions is more beneficial to generate an ideal warm white-light emission according to trichromatic theory. [7] Hence, more researchers have devoted themselves to developing the more complex tri-doped single-phase white-emitting phosphors. For example, Jiang and colleagues [8] It is a known reality that most phosphors are prepared via a conventional solid-state route, which has unavoidable disadvantages such as high synthesis temperature, nonhomogeneous mixtures and uncontrollable morphology. In particular, the obtained particles are very large with sizes in the range 1-10 μm. [9,10] In recent years, more researchers have focused on the co-precipitation method, which can overcome the above disadvantages and obtain nanophosphors with excellent luminescence properties. [9][10][11][12][13][14] Among these, Yi and colleagues [15] short, the co-precipitation method is very safe, energy-saving, timesaving option.At present, the most common hosts are aluminate and silicate systems with high stability and high QE. [16] But their synthesis conditions are harsh, in particular the synthesis temperatures are often as high as 1300°C. [17] Other materials, such as tungsten phosphate and rare earth oxides, can be easily synthesized, however they are chemically instable.[18] Barium pyrophosphate is a promising host for luminescent materials due to its low sintering temperature and stability. [18][19][20] Among the trivalent rare earth ions, Tb 3+ ion has been used frequently as the green emission center owing to its predominant 5 D 4 ! 7 F 5 transition with a peak centered at 545 nm. However, because of the forbidden transition and the weak absorption of Tb 3+ ion in the NUV region, the emission efficiency is low. [20,21] As is well known, Ce 3+ and Eu 2+ are often considered as the most important activator and effective sensitizer for Tb 3+ because of their unique electronic energy levels. [22][23][24][25] To the best of our knowledge, the crystal structures and lumines- | CharacterizationThe crystal phase of phosphor sample was analyzed by a SHIMADZU XRD-6000 diffractometer (Shimadzu Co., Japan) with Ni-filtered Cu single-phase. Ba 2 P 2 O 7 crystallized as a hexagonal structure with a space group p-62m and the lattice parameters were determined to be a = b = 9.415Å, c = 7.078Å, the crystal structure diagram of which is presented in Figure 2(a). The hexagonal form of Ba 2 P 2 O 7 signified that the sample host was at a higher temperature phase as σ-Ba 2 P 2 O 7 .Ba ions have two different types of coordination environments, in which one is coordinated b...

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Section: Resultsmentioning

confidence: 99%

“…Numerous efforts have previously been made to develop co‐doped single‐phase white‐emitting phosphors . However, with the tri‐doped phosphor it is easier to achieve tri‐chromatic (RGB) emission with complete coverage when compared with co‐doped phosphors.…”

Section: Introductionmentioning

confidence: 99%

Luminescent properties of single‐phase Ba_{2‐x‐1.5y‐1.5z}P₂O₇:xEu²⁺,yCe³⁺, zTb³⁺ phosphors for white light‐emitting diode

et al. 2017

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“…In addition, Ce 3+ has strong emission due to the allowed 4f–5d electric dipole transition with a very high absorption cross‐section in the order of 10 −18 . As a sensitizer, co‐doping Ce 3+ ions can effectively enhance the luminescence of BaZn 2 (PO 4 ) 7 :Ce 3+ ,Tb 3+ , KNaSO 4 :Ce 3+ ,Gd 3+ and Sr 8 MgLa(PO 4 ):Ce 3+ ,Mn 2+ …”

Section: Introductionmentioning

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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Solid state diffusion and amalgamating anionic exchange at a KNaSO₄ phosphors activated with Eu³⁺, Dy³⁺ and Sm³⁺ rare earth ions to enhance w‐LED performance

Duragkar¹,

Dhoble²,

Kohale

et al. 2021

Luminescence

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In present work, KNa(SO4) phosphors doped with different concentrations of rare earth Eu3+, Sm3+ and Dy3+ ions (0.05, 0.1, 0.3, 0.5, 0.7, 1 mol%) were synthesized using a solid‐state diffusion technique. Photoluminescence (PL) investigations were carried out for the whole range of Eu3+, Sm3+ and Dy3+‐doped phosphors; rare earth ions that retained maximum PL intensity were selected for advanced anionic exchange. In the present investigation, phosphors KNa(SO4):Eu3+ (1 mol%), KNa(SO4):Dy3 + (0.5 mol%) and KNa(SO4):Sm3+ (0.3 mol%) had the highest PL intensity, and were therefore selected for further anionic substitution of sulphate anions with different concentrations of vanadate, phosphate, and tungstate anions, such as KNa(SO4)1‐x(MO4)x: W (where W = Eu3+ 1 mol%, Dy3+0.5 mol% and Sm3+ 0.3 mol%; MO4 = PO4, VO4, WO4; and x = 0.1, 0.3, 0.5, 0.7, 1). Structural and molecular environments of the substituted phosphors were characterized individually using X‐ray diffraction and Fourier transform infrared spectroscopy. In‐depth morphological investigations of the prepared phosphors were undertaken using scanning electron microscopy. For the principal investigation on enhancement of white light‐emitting diode (w‐LED) performance, the PL properties of all the synthesized phosphors were studied analytically. Emission intensity ratios for KNa(SO4):Eu3+ 1 mol%, KNa(SO4)0(PO4)1:Eu 1 mol%, KNa(SO4)0.9(VO4)1:Eu 1 mol%, and KNa(SO4)0.9(WO4)0.1:Eu 1 mol% were 1:1.15:1.23:0.08. PL intensity ratios for the phosphors KNaSO4:Dy 0.5 mol% and KNa(SO4)0.9(PO4)0.1:Dy 0.5 mol% was 1:2. The ratio of PL intensity was 1:3.2:0.8 for KNa(SO4):Sm 1 mol%, KNa(SO4)0.5(PO4)0.5:Sm 0.3 mol%, and KNa(SO4)0.7(VO4)0.3:Sm 0.3 mol% phosphors, respectively. Chromaticity investigations were carried out using Commission Internationale de l'Éclairage colour co‐ordinate diagrams, which suggested that the prepared Eu3+‐doped and Sm3+‐doped phosphors would be prospective candidates for red and green LEDs, respectively, whereas Dy3+‐doped phosphors showed emission in the blue and yellow regions. The entire study indicated that amalgamation of anionic exchange at a KNaSO4 phosphor activated with Eu3+, Dy3+ and Sm3+ rare earth ions could generate and enhance white light emission.

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Energy transfer between Ce³⁺ → Gd³⁺ or Tb³⁺ in KNaSO₄ microphosphor

Cited by 4 publications

References 27 publications

Luminescent properties of single‐phase Ba_{2‐x‐1.5y‐1.5z}P₂O₇:xEu²⁺,yCe³⁺, zTb³⁺ phosphors for white light‐emitting diode

Luminescent properties of single‐phase Ba_{2‐x‐1.5y‐1.5z}P₂O₇:xEu²⁺,yCe³⁺, zTb³⁺ phosphors for white light‐emitting diode

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

Solid state diffusion and amalgamating anionic exchange at a KNaSO₄ phosphors activated with Eu³⁺, Dy³⁺ and Sm³⁺ rare earth ions to enhance w‐LED performance

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Energy transfer between Ce3+ → Gd3+ or Tb3+ in KNaSO4 microphosphor

Cited by 4 publications

References 27 publications

Luminescent properties of single‐phase Ba2‐x‐1.5y‐1.5zP2O7:xEu2+,yCe3+, zTb3+ phosphors for white light‐emitting diode

Luminescent properties of single‐phase Ba2‐x‐1.5y‐1.5zP2O7:xEu2+,yCe3+, zTb3+ phosphors for white light‐emitting diode

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

Solid state diffusion and amalgamating anionic exchange at a KNaSO4 phosphors activated with Eu3+, Dy3+ and Sm3+ rare earth ions to enhance w‐LED performance

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Energy transfer between Ce³⁺ → Gd³⁺ or Tb³⁺ in KNaSO₄ microphosphor

Luminescent properties of single‐phase Ba_{2‐x‐1.5y‐1.5z}P₂O₇:xEu²⁺,yCe³⁺, zTb³⁺ phosphors for white light‐emitting diode

Luminescent properties of single‐phase Ba_{2‐x‐1.5y‐1.5z}P₂O₇:xEu²⁺,yCe³⁺, zTb³⁺ phosphors for white light‐emitting diode

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

Solid state diffusion and amalgamating anionic exchange at a KNaSO₄ phosphors activated with Eu³⁺, Dy³⁺ and Sm³⁺ rare earth ions to enhance w‐LED performance