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oe1(光电查) - 科学论文

2 条数据
?? 中文（中国） ▾

  • Non-radiation creation of complex centers in wide-gap oxide crystals

    摘要： It is shown that complex aggregate centers of oxygen divacancy type (F2 centers) and interstitial aluminum type near the anion vacancy (Ali+) are formed in anion-deficient crystals of corundum (α-Al2O3-δ) and beryllium oxide (BeO1-δ) under thermo-optical treatment (TOT). These centers are similar to those created in stoichiometric α-Al2O3 and BeO crystals under neutron irradiation. It is important to note that thermal stability of the TOT-created complex centers is higher than that of similar neutron-induced centers. It is also established that the probability of their formation is related to the temperature of the TOT, the wavelength of the stimulating light, and the initial anionic deficiency manifested as F+ and F centers (anion vacancies with one and two electrons, respectively).

    关键词： Formation of complex defects,Wide-gap anion-deficient oxide crystals,Thermoluminescence,Optical absorption,Thermostability of complex defects,Thermo-optical treatment

    更新于2025-11-19 16:56:35

  • Visible and IR luminescence of complex centers created by thermo-optical treatment in anion-deficient corundum

    摘要： To verify the possibility of creating complex centers in anion-deficient corundum crystals (α-Al2O3-δ) by special thermo-optical treatment, optical absorption (OA) and photoluminescence (PL) spectra have been studied at nitrogen and helium temperatures. At low temperatures, the OA and PL bands recorded in the visible and near infrared (NIR) regions displayed zero-phonon lines and phonon-assisted lines. Their comparison with analogous OA and PL bands in neutron-irradiated stoichiometric α-Al2O3 samples revealed full similarity between their vibronic structures. These findings are additional evidence to support the possibility of generating non-radiatively in α-Al2O3-δ complex centers radiating in the visible and NIR regions. The results of the study will enable the applications of corundum detector and laser technologies to be extended.

    关键词： Anion-deficient corundum,Photoluminescence,Optical absorption,Vibronic structure,Formation of complex defects,Thermo-optical treatment

    更新于2025-09-19 17:15:36