Low-temperature thermoluminescence in CaGa2S4:Eu2+

Anedda, Alberto; Carbonaro, Carlo Maria; Corpino, Riccardo; Marceddu, Marco; Тагиев, О. Б.; Georgobiani, A. N.

doi:10.1016/j.jlumin.2008.02.003

Cited by 14 publications

(3 citation statements)

References 23 publications

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“…Shallow electron traps in the CaGa 2 S 4 lattice have been observed by low temperature thermo-luminescence measurements 12 and can explain the temperature dependent electron transfer to the Eu 3þ ions. It may be that the hole self-trapping at Eu 2þ induces electrons to become localized in Ga-s orbitals 13 that are nearest neighbor to the trapped hole.…”

Section: Discussionmentioning

confidence: 88%

Direct hole and delayed electron capture on a picosecond timescale by Eu2+ centers in CaGa2S4 monitored by synchroscan with horizontal blanking

Louwers¹,

Takizawa²,

Hidaka³

et al. 2012

Journal of Applied Physics

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A Eu 2þ concentration and temperature dependent energy transfer study from the host lattice to Eu 2þ luminescence centers in Ca (1-x) Eu x Ga 2 S 4 (x ¼ 0.001 to 0.05) was performed with a special streak camera that combines the high timing resolution of a conventional synchroscan operation (<2 ps) with the ability to study long lived states (10 ns À 1 ms) typical for rare earth and transition metal ions. Two transfer mechanisms from the CaGa 2 S 4 host lattice to the Eu 2þ ions were identified. A fast transfer process (<4 ps) is interpreted as sequential hole-electron capture by the Eu 2þ ions, and slower process (>1 ns) is interpreted as the sequential capture of a hole and an electron by Eu 2þ but with the electron first entering an intermediate state trapped near Eu 3þ . Energy transfer via a self-trapped excitonic (STE) state is unlikely because of the absence of an anti-correlation between the STE decay-time and the Eu 2þ rise-time as well as between the STE emission intensity and the Eu 2þ intensity. All rise-time spectra were successfully fitted with a model representing the above transfer mechanisms. V C 2012 American Institute of Physics.

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Section: Discussionmentioning

confidence: 88%

Direct hole and delayed electron capture on a picosecond timescale by Eu2+ centers in CaGa2S4 monitored by synchroscan with horizontal blanking

Louwers¹,

Takizawa²,

Hidaka³

et al. 2012

Journal of Applied Physics

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“…Легирование тиогаллата кальция ионами Dy и Nd дает возможность применения этих материалов в лазерах [12,13] Известно, что исследование ТЛ в люминесцентных материалах позволяет определить важнейшие параметры ловушечных уровней (энергия активации, сечения захвата, частотный фактор и др. ), играющих решающую роль в выявлении механизма ТЛ [16].…”

Section: поступило в редакцию 22 мая 2016 гunclassified

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

Asadov¹,

Kazimova²,

Ибрагимова³

et al. 2017

Письма В Журнал Технической Физики

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Проведены исследования термолюминесценции (ТЛ) твердых растворов Ca(Alx Ga 1−x ) 2 S 4 : Eu 2+ (x = 0.1−0.3) после ультрафиолетового облучения ме-тодом линейного нагрева. Показано, что наблюдаемые максимумы ТЛ сложные и состоят из нескольких сильно перекрывающихся парциальных максимумов, определены энергия активации, сечение захвата, частотный фактор и концен-трация ловушечных уровней, ответственных за эти максимумы. С увеличением x интенсивность излучения и число пиков растет.

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“…К числу подобных смешанных соединений относятся и кристаллы Ca(Al x Ga 1−x ) 2 S 4 : Eu 2+ , люминесцентные свойства которых исследованы в работе [5]. При изучении их термолюминесценции авторам [6,7] удалось определить важнейшие параметры ловушечных уровней (энергию активации, сечение захвата, частотный фактор, концентрацию и др. ), играющих решающую роль в выявлении механизма наблюдаемых в кристаллах явлений.…”

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Определение некоторых параметров фотолюминесценции соединения Ca(Al-=SUB=-x-=/SUB=-Ga-=SUB=-1-x-=/SUB=-)-=SUB=-2-=/SUB=-S-=SUB=-4-=/SUB=- : Eu-=SUP=-2+-=/SUP=-

Asadov¹,

Гаджиева²,

Mamedov³

et al. 2019

Письма В Журнал Технической Физики

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We synthesized a solid solution of Ca(Al_ x Ga_1 – x )_2S_4 activated with europium ions Eu^2+. The photoluminescence spectra and photoluminescence excitation spectra of the crystals at 300 K for x = 0.2 are measured. The dependence of the luminescence intensity on the temperature in the range of 10–300 K is investigated. Based on the experimental results, the redshift, the Stokes shift, the activation energy, and the lifetime of the Eu^2+ ions are determined.

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Low-temperature thermoluminescence in CaGa2S4:Eu2+

Cited by 14 publications

References 23 publications

Direct hole and delayed electron capture on a picosecond timescale by Eu2+ centers in CaGa2S4 monitored by synchroscan with horizontal blanking

Direct hole and delayed electron capture on a picosecond timescale by Eu2+ centers in CaGa2S4 monitored by synchroscan with horizontal blanking

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

Определение некоторых параметров фотолюминесценции соединения Ca(Al-=SUB=-x-=/SUB=-Ga-=SUB=-1-x-=/SUB=-)-=SUB=-2-=/SUB=-S-=SUB=-4-=/SUB=- : Eu-=SUP=-2+-=/SUP=-

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