X-ray excited optical luminescence of CaF2: A candidate for UV water treatment

6th International Conference on Optical, Optoelectronic and Photonic Materials and Applications 2014

Chen, W.^1 ; Ma, L.^1 ; Schaeffer, R.^1 ; Hoffmeyer, R.^2 ; Sham, T.^3 ; Belev, G.^4 ; Kasap, S.^5 ; Sammynaiken, R.^2

Department of Physics, University of Texas, Arlington

TX, United States^1

Saskatchewan Structural Sciences Centre, University of Saskatchewan, Saskatoon

SK

S7N 5C9, Canada^2

Department of Chemistry, University of Western Ontario, London

ON

N6A 5B7, Canada^3

Canadian Light Source Inc., 101 Perimeter Road, Saskatoon

SK

S7N 0X4, Canada^4

Department of Electrical Engineering, University of Saskatchewan, Saskatoon

SK

S7N 5A9, Canada^5

关键词: Band-gap emission;    Environmental applications;    In-vacuum;    Optical process;    Reactive oxygen species;    Self-trapped exciton;    Time-resolved;    X-ray excited optical luminescence;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/619/1/012047/pdf
DOI  :  10.1088/1742-6596/619/1/012047

来源: IOP

【 摘 要 】

Secondary optical processes are becoming more and more important in health and environmental applications. Ultraviolet produced from secondary emission or scintillation can damage DNA by direct photoexcitation or by the creation of reactive oxygen species. X-ray Excited Optical Luminescence (XEOL) and Time Resolved XEOL (TRXEOL) results for the fast emitter, CaF2:ZnO, that have been treated by heating in air and in vacuum, show that the scintillation from the Self Trapped Exciton (STE) emission of CaF2at 282 nm is dominated by a slow process (>100 ns). A faster but weaker 10 ns component is also present. The ZnO and CaF2 show independent emission. The ZnO bandgap emission at 390 nm has dominant lifetimes of less than 1 ns.