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Structural, luminescent and thermal properties of blue SrAl2O4:Eu, Dy phosphor filled low-density polyethylene composites |
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| Authors: | D.B. Bem F.B. Dejene J.R. Botha |
| Affiliation: | a Department of Physics, University of the Free State (Qwaqwa Campus), Private Bag X13, Phuthaditjhaba 9866, South Africa b Department of Chemistry, University of the Free State (Qwaqwa Campus), Private Bag X13, Phuthaditjhaba 9866, South Africa c Department of Physics, University of the Free State, P.O. Box 339, Bloemfontein 9300, South Africa d Department of Physics, Nelson Mandela Metropolitan University, P.O. Box 70000, Port Elizabeth 6031, South Africa |
| Abstract: | The performance of nanophase luminophors is usually compromised by environmentally induced degradation. In this study, composites of low density polyethylene (LDPE) with various concentrations of the blue-emitting europium and dysprosium co-doped strontium aluminate (SrAl2O4:Eu2+,Dy3+) phosphor were investigated. The blue long-lasting phosphorescence of the composites was observed in the dark after removal of the excitation light. X-ray diffraction analysis revealed the presence of the SrAl2O4 phase in the composites. PL spectra of the composites have two sets of peaks, major broad bands peaking at about 4855 Å and minor ones at wavelengths between 4115 and 4175 Å, attributed to the 4f-5d transition of Eu2+. DSC and TGA results show that the introduction of the phosphor in LDPE matrix caused a slight reduction in the crystallinity of LDPE but a significant increase in the stability of the composites. |
| Keywords: | 71.20.Nr 78.40.Fy 78.47.Cd 78.55.Ap |
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