Ukrainian Journal of Physical Optics

2023 Volume 24, Issue 4

ISSN 1816-2002 (Online), ISSN 1609-1833 (Print)

Thermally induced effects in the optical absorption of pure and doped Bi12SiO20 single crystals

Panchenko T.V. and Trubitsyn M.P.

Institute for Energy Efficient Technologies and Materials Sciences, Oles Honchar Dnipro National University, Gagarin Ave. 72, 49045, Dnipro, Ukraine


We study the optical absorption spectra for pure Bi12SiO20 single crystals and the crystals doped with Cr and Mn ions. These spectra are measured in the photon-energy region 1.3–2.6 eV at the temperatures 300–670 K. The intrinsic defects with significantly different optical and thermal activation energies (respectively 1.493 and 0.66 eV) are revealed in Bi12SiO20. The strengths S of electron–phonon interactions at the intra-centre transitions in Cr and Mn ions are determined. We obtain S ≈ 3.33 (at 300 K) and 3.42 (at 420 K) for Bi12SiO20:Cr, as well as S ≈ 5.26 (at 300 K) and 5.46 (at 420 K) for Bi12SiO20:Mn. A significant thermochromic effect is detected in Bi12SiO20:Cr crystals

Keywords: optical absorption spectra, thermally induced effects, sillenite crystals Bi12SiO20, doping Cr and Mn ions

UDC: 537.311.1

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    Досліджено спектри оптичного поглинання чистих монокристалів Bi12SiO20 і цих же кристалів, легованих йонами Cr і Mn. Спектри виміряно в області енергій фотонів 1,3–2,6 еВ за температур 300–670 К. У кристалах Bi12SiO20 виявлено власні дефекти із суттєво різними оптичними та термічними енергіями активації (відповідно 1,493 і 0,66 еВ). Визначено сили S електрон-фононної взаємодії при внутрішньоцентрових переходах у йонах Cr і Mn. Одержано S ≈ 3,33 (при 300 К) і 3,42 (при 420 К) для Bi12SiO20:Cr, а також S ≈ 5,26 (при 300 К) і 5,46 (при 420 К) для Bi12SiO20:Mn. У кристалах Bi12SiO20:Cr виявлено значний термохромний ефект.

    Ключові слова: спектри оптичного поглинання, термоіндуковані ефекти, кристали силеніту Bi12SiO20, легуючі Cr і Mn іони

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