Photoluminescence Properties of Lithium Europium Molybdate Phosphor and Its Correlational Effects with the Crystal Structure in the Substitution of Non-activating Cations
Testing
Research Domain: Pure and Applied Science
Sub Domain: Materials Science
DR MOHD FATHULLAH BIN GHAZLI @ GHAZALI
Associate Professor
Universiti Malaysia Perlis
Faculty of Mechanical Engineering Technology
fathullah@unimap.edu.my
NO |
NAME |
INSTITUTION |
FACULTY/SCHOOL/ CENTRE/UNIT |
1 |
Rosli Hussin |
UTM |
Fakulti Sains |
2 |
Shayfull Zamree Bin Abd Rahim |
UNIMAP |
Schools of Manufacturing |
3 |
Uda Bin Hashim |
UNIMAP |
Institute of Nano Electronic Engineering |
2 years (1 August 2016 - 31 July 2018)
Rare earth elements (REEs) such as Eu3+ are very important in contributing to the luminescence properties of phosphors. Current economic situation and environmental awareness has forced global industries to look for less consumption of REEs without compromising the luminescence properties of phosphors as required by lighting industries. In searching for highly efficient and ‘cost-saving’ red phosphor in lightings, Lithium Europium Molybdate LiEu(MoO4)2 is among the best candidates to be researched.
The main objective of this research is to study the relationship between the photoluminescence properties of Lithium Europium Molybdate phosphor and the change on its crystal structure in substituting with non-activating cations.
As for the methodology, Europium (III) will be substituted using chemical formula LiEu1-xCx(MoO4)2 (x=0,0.1,0.2,0.3,…1), C=Al3+,Y3+ and Gd3+. Photoluminescence properties of the phosphors will be studied in the function of increasing non-activating cations (Al3+, Y3+ and Gd3+). Further material characterizations will be performed so the relationship between the photoluminescence and changes in crystal structure can be evaluated accordingly.
The evaluation on the relationship between photoluminescence and the crystal structure is significant in understanding the behavior of how new cations can influence the luminescence of phosphor thereby can lead to a decision either the expensive Eu3+ activators can be substituted.
It is expected that the amount of Eu3+ can be reduced to a certain amount of concentration without affecting the photoluminescent properties. This is due to the amount of Eu3+ cannot be too less but also cannot be too much in phosphor due to the concentration quenching phenomena and having said that, no optimization works have ever been done yet on molybdate phosphor. Therefore, there must be an optimum point which has not been found yet which needs to be answered
- To understand the effects on the shapes, intensity and changes in position of emission and excitation spectra of phosphor in the function of increasing non-activating cations.
- To investigate the optimum amount of rare earth activators can be employed in lithium europium molybdate phosphors.
- To compare the optical behaviour of the phosphor with different non-activating cations in phosphor host lattices.
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Intellectual Property :
- New Discovery of Sm3+ in reducing cost for Red Phosphor in white LED applications
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Publication : Article in Indexed Journals
- 8 articles have been published (Scopus Proceeding).
- article for ISI indexed journal is in progress.
- 2 conferences attended (Vietnam & Romania).
- 1 Impact Factor Journal (Q3, I.F 0.5) has been published.
- 1 Poster Exhibitions have been participated.
- EUROPEAN EXHIBITION OF CREATIVITY AND INNOVATION (SPECIAL AWARDS)
- EUROPEAN EXHIBITION OF CREATIVITY AND INNOVATION (GOLD)
The current issues as highlighted in the literature need serious attention on seeking for more environmental friendly lighting devices. Therefore, this research will look for minimizing the use of rare earth elements on lightings which gives ;
- Huge environmental benefits (less pollution) to the society,
- In line with the National Green Technology Policy set by the government.