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Photoluminescence of Bi12SiO20 crystals

Panchenko T. V., Dyachenko A. A. and Khmelenko O. V.

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Abstract. Spectra of photoluminescence (PL), luminescence excitation, stationary and photoactivated optical absorptions and photoconductivity are studied for Bi12SiO20 crystals. The PL spectra contain wide bands, of which shapes differ for the cases of electronic valence-to-conduction band excitation (the photon energies hν = 3.3–4.0 eV) and the excitation occurring from the impurity absorption band (hν = 2.8–2.9 eV). The photochromic effect and the induced impurity photoconductivity are also observed. Recombination and intra-centre mechanisms of the PL are discussed.

Keywords: photoluminescence, optical absorption, photoconductivity, recombination centres, Bi12SiO20 crystals

PACS: 42.70.±a; 78.55.±m
UDC: 535.3
Ukr. J. Phys. Opt. 17 39-45
doi: 10.3116/16091833/17/1/39/2016
Received: 28.10.2015

Анотація. Досліджено спектри фотолюмінесценції (ФЛ) і збудження люмінесценції, стаціонарних і фотоактивованих оптичного поглинання і фотопровідності в кристалах Bi12SiO20. Спектри ФЛ містять широкі смуги, форма яких відрізняється для випадків електронного збудження за схемою валентна зона–зона провідності (енергія фотонів hν = 3.3–4.0 еВ) і збудження зі смуги домішкового поглинання (hν = 2.8–2.9 eV). Спостережено також фотохромний ефект та індуковану домішкову фотопровідність. Обговорено рекомбінаційний і внутріцентровий механізми ФЛ.
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