| Autor: |
Yu.M. Aleksandrov, Vladimir N. Makhov, I.L. Kuusmann, Sergey B. Mirov, M.N. Yakimenko, T.V. Uvarova |
| Rok vydání: |
1991 |
| Předmět: |
|
| Zdroj: |
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 308:208-210 |
| ISSN: |
0168-9002 |
| DOI: |
10.1016/0168-9002(91)90628-4 |
| Popis: |
Time-resolved luminescence excitation spectra under synchrotron radiation (10–30 eV) excitation for the barium-containing compounds BaLn 2 F 8 (Ln = Y, Tm, Yb), (BaF 2 ) 1- x (NdF 3 ) x ( x = 0.005−0.3) and SrF 2 Ba 2+ (0.1–1%) were investigated. It was shown that BaY 2 F 8 crystals have fast cross-luminescence with an excitation threshold at hv = 19.3 eV and spectral characteristics similar to that of BaF 2 . By introducing in BaF 2 rare-earth elements with unfilled 4f-shells the long luminescence of self-trapped excitons is suppressed, but fast cross-luminescence is suppressed as well. The existence of impurity cross-luminescence in SrF 2 Ba (excitation threshold at about 18.5 eV) was confirmed. Investigations of impurity cross-luminescence give information about the band structure of crystals which do not have intrinsic cross-luminescence. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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