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本工作研究460 keV、3 MeV和308 MeV Xe23+辐照Al2O3单晶样品的光致发光特性。从经过460 keV Xe23+辐照后样品的光致发光测试结果可看到,波长为380、413和450 nm的发光峰明显增强,在390和564 nm处出现了新的发光峰。从3 MeV的Xe23+辐照后样品谱的变化可看到,在较低剂量条件下,516 nm(2.4 eV)和564 nm(2.2 eV)处的发光峰随辐照剂量增加而增强,且当剂量增到1×1016cm-2时,564 nm处的发光峰消失,只有516 nm(2.4 eV)处的发光峰较强。从308 MeV Xe23+辐照后样品的光致发光谱中可看到,357 nm(3.47 eV)和516 nm(2.4 eV)处的发光峰随着剂量增加明显增强。辐照后样品的FTIR谱显示:波数在460~510 cm-1和630 cm-1附近的吸收是Al2O3振动模式,经离子辐照后,吸收带展宽;1 000~1 300 cm-1间为Al—O—Al桥氧键的伸缩振动模式,高能辐照后的吸收带向低波数方向移动。
In this work, the photoluminescence (PL) characteristics of 460 single-crystal samples irradiated by 460 keV, 3 MeV and 308 MeV Xe23 + were studied. The photoluminescence results of the samples irradiated with 460 keV Xe23 + showed that the luminescence peaks at 380, 413 and 450 nm were significantly enhanced, and new luminescence peak appeared at 390 and 564 nm. It can be seen from the change of sample spectra after 3 MeV Xe23 + irradiation that under the lower dose conditions, the luminescence peaks at 516 nm (2.4 eV) and 564 nm (2.2 eV) increase with the increase of radiation dose, and when When the dose was increased to 1 × 10 16 cm -2, the luminescence peak disappeared at 564 nm, and only the luminescence peak at 516 nm (2.4 eV) was strong. It can be seen from the photoluminescence spectra of the samples after irradiation with 308 MeV Xe23 + that the luminescence peaks at 357 nm (3.47 eV) and 516 nm (2.4 eV) are significantly enhanced with increasing dose. The FTIR spectra of the samples after irradiation show that the absorption of wavenumbers around 460-510 cm-1 and 630 cm-1 is the vibrational mode of Al2O3, and the absorption band broadens after ionizing irradiation. The bands between 1000-1 300 cm-1 are Al-O-Al bridge oxygen bond stretching vibration mode, the absorption band after high-energy radiation to the low wavenumber direction.