|
|||||
|
|
Structural, luminescent and thermal properties of blue SrAl2O4:Eu, Dy phosphor filled low-density polyethylene composites |
|
| Authors: | DB Bem FB Dejene JR Botha |
| Institution: | 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 |
| 本文献已被 ScienceDirect 等数据库收录！ | |