Mohd Fathullah Ghazli@Ghazali
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Mohd Fathullah Ghazli@Ghazali
Official Name
Mohd Fathullah, Ghazli@Ghazali
Alternative Name
Fathullah, Mohd
Ghazli, Mohd
Ghazli, M. F.
Ghazali, Mohd Fathullah
Fathullah, G. M.
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Scopus Author ID
57428935900
Researcher ID
AAK-5597-2020

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  • Publication
    Influence of Sm³⁺ in alkaline metals Eu³⁺ molybdate/tungstate red phosphor: a review
    ( 2017-09-26)
    Syazwanie Zailani
    ;
    Mohd Fathullah Ghazli@Ghazali
    ;
    Rosli Hussin
    This paper reviews on previous and on-going works relating to the interaction of Eu³⁺ and Sm³⁺ used in AGd(1-x)Eux(MO4)2 where (A=Li+, K+ and Na+) and (M=Mo and W) in alkaline metals red phosphors - AGd(1-x)EuxSmy(MoO4)2. A literature review in terms of its crystal structures as well its effects on the photoluminescence properties of the phosphor is elucidated herein. The outcome from this review concludes that there is a large possibility that a more efficient red phosphor can be obtained by introducing Sm³⁺ on AGd(1-x)EuxSmy(MoO4)2.
      1  7
  • Publication
    Analysis on addition of novel Sm3+ in replacing Eu3+ in lieu(0.45-x)Gd0.55(MoO4)2 phosphor
    ( 2020-08-01)
    Mohd Fathullah Ghazli@Ghazali
    ;
    Hussin R.
    ;
    Shayfull Zamree Abd. Rahim
    ;
    Mohd. Mustafa Al Bakri Abdullah
    ;
    Nurul Syazwani Mohd Zailani
    Europium is amongst the most critical and expensive rare earths due to its luminescence properties for red element in displays and lighting technology. As the market demand of Europium is now at scarce, this paper tried minimize the use of Europium. In the mean time, Samarium (Sm3+) has been of interests as it can contribute in the red/orange emitting activator but researches of Sm3+ potentials in replacing Eu3+ was hardly found. In this article, a series of red phosphors LiEu(0.55-x)Gd0.45(MoO4)2Smx were synthesised using solid-state reaction and an XRD analysis conducted confirmed that the structure of the compounds to remain as tetragonal scheelite structure. Results showed that 0.10 mol of Sm3+ can increase the luminescence intensity and the overlaid patterns show that there are no additional peaks occurred in the increasing of Sm3+ to the compound which confirm that the structure remained tetragonal scheelite structure with space group I41/a. This finding has opened an opportunity for industries and researchers to use Sm3+ in reducing the cost of consuming Eu3+ in lighting technologies.
      2  15
  • Publication
    Synthesis and Luminescent Properties of LiEu (0.50-x) Gd 0.50 (WO 4) 2 Sm x Red Phosphor
    ( 2018-06-12)
    Syazwanie Zailani
    ;
    Mohd Fathullah Ghazli@Ghazali
    ;
    Rosli Hussin
    ;
    Shayfull Zamree Abd. Rahim
    ;
    Mohd. Nasir Mat Saad
    Red phosphor is widely used in enhancing white light emitting diodes. Recent trends show there are several efforts in improving the efficiency of lighting particularly using Europium (III) as activators in Gadolinium tungstate phosphors. In this work, LiEu(0.50-x)Gd0.50(WO4)2Smx red phosphor was synthesized using solid-state reaction. The crystal structure, morphology and photoluminescence properties of the sample were analysed. The structure of the phosphor was found to be tetragonal with space group I41/a by characterizing the phosphor using the X-ray powder diffraction (XRPD) application. The morphologies present the angular-shaped particles. The highest emission peak occurred at 615 nm corresponding to the 5D0→7F2 transition under near-UV region. The optimum amount of Sm3+ that enhanced the intensity of the host lattice at x = 0.15 mol. The improvement on the photoluminescence properties of these phosphors without any changes on the structure and crystal symmetry shows a good potential of the red emitting phosphor to be used in the light emitting diodes (WLEDs) applications.
      19  1