II-III₂-VI₄ Compounds: Technology, Physical Properties and Application

Abstract

Semiconductors with the common composition II-III2-VI4 (where II are divalent cathions; III – trivalent cathions and VI – chalcogenides) are perspective materials for optoelectronics. The electrical properties, luminescence, photoconductivity and thermally stimulated depolarization of these compounds have been investigated MnGa2Se4, MnGa2S4, MnIn2S4, MnGaInS4 and PbGa2Se4 compounds possess high photosensitivity. CaGa2S4 doped with rare-earth elements have been found to be effective luminescent semiconductor materials.

Photoluminescence of Ca(Ba)Ga2S4:RE poly- and nanocrystals

“…The excitation and emission spectra of CaGa 2 S 4 :Eu 2+ nanopowders and bulk crystals were measured at temperatures of 77 and 300 K. In previous studies [4][5][6], PL measurements in the temperature range 77-500 K showed that, in various rare earth doped calcium thiogallates and calcium selenogal lates, the energy position of the PL peak is almost independent of temperature, whereas its full width at half maximum (FWHM) decreases with decreasing temperature [4][5][6]. The FWHM Г(Т) increases in proportion to the square root of the temperature (Т 1/2 ), according to the relation…”

“…Past results [1][2][3][4][5][6] show that, at pump pulse power densities above 10 4 W/cm 2 , compounds in the Ca(Ba,Sr)-Ga-S(Se) systems efficiently emit light in the visible range at different wavelengths, depending on composition. These materials can be represented by the general formula where n = 1-4, m = n + 3, A II is a divalent cation (Eu, Yb, Sm, Ca, Ba, or Sr), B III is a trivalent cation (Al, Ga, or In), and C VI is a chalcogen.…”

“…[5,6] for the synthesis of Са(Ва)Ga 2 S 4 :RE makes it possible to prepare poly crystals of these ternary compounds with a perfect crystal structure. The efficiency and brightness of these phosphors depend on the procedure they were prepared by.…”

Термостимулированная люминесценция кристалла Ca(Al-=SUB=-x-=/SUB=-Ga-=SUB=-1-x-=/SUB=-)-=SUB=-2-=/SUB=-S-=SUB=-4-=/SUB=-:Eu-=SUP=-2+-=/SUP=-

“…DOI: 10.21883/PJTF.2017.04. 44296.16340 Легированный редкоземельными элементами (РЗЭ) тиогаллат каль-ция (CaGa 2 S 4 ) является перспективным материалом в оптоэлектронике и фотонике [1]. Максимальная энергия фононов и хорошие оптические свойства позволяют получать высокоэффективные люминофоры, а элек-тропроводность бывает пригодна для создания электролюминесцентных дисплеев [2][3][4] [5][6][7][8][9][10].…”

Low-temperature thermoluminescence in CaGa2S4:Eu2+

“…Calcium thiogallate (CaGa 2 S 4 ) doped with REE is a prospective material for optoelectronic and photonic applications [12]. Maximum phonon energy and good optical transmission properties allows to the realization of high-efficiency phosphors [13,14], whose good electrical conduction properties are also promising for electroluminescent displays [15].…”