Fast luminescence in vacuum ultraviolet region in heavy-ion-irradiated alpha-Al2O3

作者：Koshimizu Masanori^*; Kimura Kazuie; Fujimoto Yutaka; Asai Keisuke

来源：Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms , 2015, 365: 540-543.

DOI：10.1016/j.nimb.2015.07.118

• Self-trapped excitons
• Self-shrunk excitons
• High-density excitation
• Track formation

We analyzed the time-resolved luminescence properties of alpha-Al2O3 under heavy ion irradiations in the vacuum ultraviolet (VUV) wavelength region. A luminescence band at approximately 170 nm, at which a luminescence band was observed under VUV irradiation and was ascribed to self-shrunk excitons. The decay rate increased with the linear energy transfer (LET). The luminescence efficiency of the band increased sharply with the LET for the case of Xe irradiation, whose LET was estimated to be higher than the threshold LET for track formation. The fast decay rate and high luminescence intensity for Xe irradiation was explained according to the enhanced radiative rate caused by close interactions among excited states.

• 出版日期2015-12-15
• 单位RIKEN