Photoluminescence and excitation spectra of ScF₃ single crystals have been measured under vacuum ultraviolet excitations utilizing undulator synchrotron radiation from 1.5 GeV storage ring of MAX IV synchrotron. The emission peak at 280 nm is explained as emission band of self-trapped excitons in ScF₃. This emission is quenched at 50 K and activation energy of thermal quenching was obtained. The excitation spectrum in vacuum ultraviolet spectral range exhibits that the luminescence of self-trapped excitons effectively occurs under direct excitation in the excitonic absorption band, whereas under higher energies this excitation is strongly suppressed, however, multiplication of electronic excitation processes have been successfully identified.

中文翻译：

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VUV同步加速器辐射激发下的ScF3单晶的低温发光

利用来自MAX IV同步加速器1.5 GeV存储环的波荡器同步加速器辐射，在真空紫外激发下测量了ScF ₃单晶的光致发光和激发光谱。280 nm处的发射峰解释为ScF ₃中自陷激子的发射带。该发射在50 K处淬灭并获得热淬灭的活化能。真空紫外光谱范围内的激发光谱显示出，自陷陷的激子的发光在激子吸收带中的直接激发下有效发生，而在更高的能量下，这种激发被强烈抑制，但是，电子激发过程的繁复已被成功鉴定。