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Photoluminescence in the solid solution In0.5Tl0.5I

1,2Kashuba A.I., 3,4Zhydachevskyy Ya.A., 4Semkiv I.V., 1Franiv A.V. and 2Kushnir O.S.

1Physics Department, Ivan Franko National University of Lviv, 8a Kyrylo and   Mefodiy Street, 79005 Lviv, Ukraine
2Electronics and Computer Technologies Department, Ivan Franko National University of Lviv, 107 Tarnavsky Street, 79005 Lviv, Ukraine
3Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland
4 General Physics Department, Lviv Polytechnic National University, 12 Bandera Street, 79646 Lviv, Ukraine
 

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Abstract. Photoluminescence (PL) emission spectra are studied for InxTl1-xI solid solution with x ≈ 0.5. Two broad bands located approximately at 1.6 and 2.2 eV are found and their physical mechanisms are discussed. The low-energy band has not been earlier detected in the pure InI compound but resembles that observed in TlI. Time decay of the PL in In0.5Tl0.5I is studied. Strong temperature dependence of the PL intensity is revealed. Optical absorption edge in In0.5Tl0.5I is found to be formed predominantly by inter-cation transitions. PL excitation spectra are measured for the light wavelengths 570 and 800 nm and their parameters are evaluated.

Keywords: photoluminescence, luminescence decay, excitation spectra, excitons, InI–TlI solid solutions.

PACS: 78.55.-m 
UDC: 535.37, 538.958
Ukr. J. Phys. Opt. 19 1-8
doi: 10.3116/16091833/19/1/1/2018
Received: 31.10.2017

Анотація. Експериментально досліджено спектри випромінювання фотолюмінесценції (ФЛ) для твердого розчину InxTl1-xI при x ≈ 0,5. Виявлено дві широкі смуги ФЛ, розташовані приблизно при 1,6 і 2,2 еВ, і обговорено їхні фізичні механізми. Низькоенергетична смуга, яку не було виявлено в чистому InI, нагадує смугу, спостережену раніше в TlI. Вивчено часове затухання ФЛ в In0.5Tl0.5I. Виявлено значну температурну залежність інтенсивності ФЛ. Показано, що край оптичного поглинання In0.5Tl0.5I формується переважно міжкатіонними переходами. Виміряно спектри збудження ФЛ для довжин хвиль 570 і 800 нм і оцінено їхні параметри.
 
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