کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1494016 | 1510796 | 2014 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Optical functions and time-resolved luminescence of lithium hydride single crystals upon far-ultraviolet excitation
ترجمه فارسی عنوان
توابع نوری و نوردهی زمانی حل شده از کریستال های لیتیوم هیدرید بر روی تحریک فراوان ماوراء بنفش
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
چکیده انگلیسی
Low-temperature reflection spectra of lithium hydride (LiH) single crystals cleaved in ultrahigh vacuum (3Â ÃÂ 10â10Â Torr, TÂ =Â 10Â K), were recorded using synchrotron radiation in vacuum ultraviolet spectral region. Based on the obtained experimental data, the optical functions of LiH in the energy range from 3.7 to 35Â eV were analyzed using the Kramers-Krönig relations. Time-resolved photoluminescence excitation spectra were studied in detail for the near edge free exciton-phonon luminescence at 4.67Â eV and photoluminescence at 2.4Â eV due to the Bi3+ impurity centers. The effect of multiplication of electronic excitations due to inelastic scattering of hot photoelectrons and hot photoholes was revealed at photon energies above 15Â eV (more than 3Eg). It was found that the radiative lifetime for free excitons in LiH at 4.67Â eV is less than 1Â ns as low temperatures as at 10Â K. The interpretation of the electronic band structure of lithium hydride in the ultraviolet and vacuum ultraviolet spectral regions were carried out on the basis of the present experimental results with the involvement of the available band structure calculations.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optical Materials - Volume 38, December 2014, Pages 97-101
Journal: Optical Materials - Volume 38, December 2014, Pages 97-101
نویسندگان
V.A. Pustovarov, I.N. Ogorodnikov, M. Kirm,