Effect of excitation level on the photoluminescence of barium thiogallate activated with europium and cerium ions

Zubialevich, Vitaly Z.; Луценко, Е. В.; Danilchyk, A. V.; Muravitskaya, E. V.; Yablonskii, G. P.; Pashaev, A. M.; Тагиев, Б. Г.; Тагиев, О. Б.; Абушов, С. А.

doi:10.1007/s10812-011-9452-7

Cited by 10 publications

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“…Barium, strontium, and calcium thiogallates activated by Eu 2+ ions are efficient phosphors emitting in the blue-green spectral region due to the 4 f 6 5d → 4 f 7 electronic transitions [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Luminescence of Ca0.5Ba0.5Ga2S4 crystals activated by Eu2+ and Er3+ ions

Тагиев

Nagiev

et al. 2015

Opt. Spectrosc.

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The photoluminescence (PL) in the visible spectral range of Ca 0.5 Ba 0.5 Ga 2 S 4 solid solutions activated with ions of rare-earth elements Eu 2+ and Er 3+ has been studied in the temperature range of 10-300 K. The PL spectrum contains a strong luminescence band peaking at 530 nm, which is due to the 4 f 6 5d → 4 f 7 transitions in Еu 2+ ions and weak lines in the range of 650-675 nm, which are due to the 4 F 9/2 → 4 I 15/2 transitions in Er 3+ ions. The position of the PL spectrum and the total PL intensity are characterized by high temperature stability in the range of 10-300 K; the total PL intensity decreases by only 13% with respect to the maximum value at 10 K. The PL decay time and the activation energy of nonradiative recombination channels are found to be τ e = 291 ns and E a = 41 meV, respectively. INTRODUCTIONPhotoluminescence (PL) of ions of rare-earth elements (REEs) in wide-gap semiconductors has been intensely investigated, because these compounds are characterized by high luminescence efficiency due to the excitation of REE-ion PL through the semiconductor matrix [1][2][3]. A study of the luminescence properties of REEs in semiconductors and insulators yields information about the nearest REE environment and the symmetry of PL centers and crystal field. Ternary alkali-earth chalcogenide semiconductors of the II-III 2 -VI 4 type (II: Ba, Sr, or Ca; III: Ga or Al; and VI: S, Se, or O), activated by REE (Eu, Ce, Er, Yb, Pr, or Sm) ions, are promising phosphors.Calcium thiogallates doped with Еr 3+ ions exhibit strong Stokes and anti-Stokes luminescence in the visible spectral range at wavelengths of 530 nm ( 2 H 11/2 → 4 I 15/2 ), 550 nm ( 4 S 3/2 → 4 I 15/2 ), and 660 nm ( 4 F 9/2 → 4 I 15/2 ) and in the near-IR region at 870-920 nm ( 4 S 3/2 → 4 I 13/2 ), 976 nm ( 4 I 11/2 → 4 I 15/2 ), and 1530 nm ( 4 I 13/2 → 4 I 15/2 ) [4,5]. Barium, strontium, and calcium thiogallates activated by Eu 2+ ions are efficient phosphors emitting in the blue-green spectral region due to the 4 f 6 5d → 4 f 7 electronic transitions [6][7][8][9][10].Luminescence efficiency can be increased using more than one type of REE ions as dopants due to the excitation-energy transfer from one REE ion to another. In particular, in barium thiogallates activated

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Section: Introductionmentioning

confidence: 99%

“…In particular, in barium thiogallates activated by Eu 2+ , codoping with Ce 3+ ions leads to a doubling in the luminescence intensity of Eu 2+ due to the transfer of excitation energy from Се 3+ to Eu 2+ ions [9]. A mechanism of energy transfer between Eu 2+ and Er 3+ ions in EuGa 2 S 4 :Er compounds was implemented in [11].…”

Section: Introductionmentioning

confidence: 99%

Luminescence of Ca0.5Ba0.5Ga2S4 crystals activated by Eu2+ and Er3+ ions

Тагиев

Nagiev

et al. 2015

Opt. Spectrosc.

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“…Promising luminescent media include ternary chalcogenide semiconductors, in particular barium thiogallate (BaGa 2 S 4 ), strontium thiogallate (SrGa 2 S 4 ), and calcium thiogallate (CaGa 2 S 4 ) activated by rare-earth ions Eu or Ce [1-5]. These compounds differ from the binary compounds (GaS, Ga 2 S 3 ) in their resistance to hydrolysis and their good ability to incorporate rare-earth ions into their crystal lattice [5]. The compounds BaGa 2 S 4 and CaGa 2 S 4 activated by Eu 2+ ions display intense emission in the blue-green (~500 nm) and yellow (~555 nm) regions of the spectrum, due to 4f 6 5d → 4f 7 electronic transitions in the europium ions [1].…”

mentioning

confidence: 99%

“…The compounds BaGa 2 S 4 and CaGa 2 S 4 activated by Eu 2+ ions display intense emission in the blue-green (~500 nm) and yellow (~555 nm) regions of the spectrum, due to 4f 6 5d → 4f 7 electronic transitions in the europium ions [1]. They are characterized by high thermal stability of the spectrum and photoluminescence (PL) intensity, and exhibit extreme stability of the position and shape of the spectrum and linearity of the photoluminescence intensity over a broad range of pulsed optical excitation all the way up to 10 4 W/cm 2 [5]. The presence of intense bands in the violet-blue region in the photoluminescence excitation (PLE) spectra of BaGa 2 S 4 :Eu and CaGa 2 S 4 :Eu makes them promising for effi cient excitation by the emission from commercial GaN and InGaN light-emitting diodes (LEDs) and laser diodes (LDs).…”

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Photoluminescence of Ca x Ba1–x Ga2S4 Solid Solutions Activated by Eu2+ Ions

et al. 2015

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We have studied the photoluminescence (PL) of Ca x Ba 1-x Ga 2 S 4 solid solutions (x = 0.1, 0.2, 0.3, 0.4, and 0.5) activated by ions of the rare-earth element Eu 2+ in the temperature range 10-300 K, due to 4f 6 5d → 4f 7 transitions in the Eu 2+ ions. The photoluminescence spectra of Ca x Ba 1-x Ga 2 S 4 :Eu are located in the blue-green -green regions, and their maxima are shifted from 506 nm for x = 0.1 to 531 nm for x = 0.5. We show that the long-wavelength shift as Ca content increases is due to the increasing crystal fi eld, in the presence of which the 5d orbitals of the europium ions are split and consequently the energy of the recombination transitions decreases. We observed high temperature stability of the position of the photoluminescence spectra and the integrated intensity (decreasing by 13% for all x) in the temperature range 10-300 K. We have established that an increase in the Ca content in Ca x Ba 1-x Ga 2 S 4 :Eu leads to a decrease in the thermal shift of the photoluminescence, and for x = 0.5 there is no shift.Introduction. Synthesis of high-effi ciency luminophores emitting in the visible region of the spectrum is a key problem to be solved in designing devices for visualization and illumination that are competitive with conventional systems. Promising luminescent media include ternary chalcogenide semiconductors, in particular barium thiogallate (BaGa 2 S 4 ), strontium thiogallate (SrGa 2 S 4 ), and calcium thiogallate (CaGa 2 S 4 ) activated by rare-earth ions Eu or Ce [1-5]. These compounds differ from the binary compounds (GaS, Ga 2 S 3 ) in their resistance to hydrolysis and their good ability to incorporate rare-earth ions into their crystal lattice [5]. The compounds BaGa 2 S 4 and CaGa 2 S 4 activated by Eu 2+ ions display intense emission in the blue-green (~500 nm) and yellow (~555 nm) regions of the spectrum, due to 4f 6 5d → 4f 7 electronic transitions in the europium ions [1]. They are characterized by high thermal stability of the spectrum and photoluminescence (PL) intensity, and exhibit extreme stability of the position and shape of the spectrum and linearity of the photoluminescence intensity over a broad range of pulsed optical excitation all the way up to 10 4 W/cm 2 [5]. The presence of intense bands in the violet-blue region in the photoluminescence excitation (PLE) spectra of BaGa 2 S 4 :Eu and CaGa 2 S 4 :Eu makes them promising for effi cient excitation by the emission from commercial GaN and InGaN light-emitting diodes (LEDs) and laser diodes (LDs). Recently there have been studies of the optical properties of mixed compounds MGa 2 S 4 -M ' Ga 2 S 4 (M, M ' = Ba, Sr, Ca (alkaline earth elements) activated by rare-earth ions, in which variation of the composition of the matrix leads to a shift of the spectrum in the visible region [6,7]. Such mixed compounds are novel and their photoluminescence has not been suffi ciently studied.With the aim of varying the emission wavelength within the blue-green-yellow regions of the spectrum (505-555 nm), we synthesized novel...

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