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首页> 外文期刊>Physica, B. Condensed Matter >Photoluminescence and EPR studies on gamma irradiated Ce~3 doped potassium halide single crystals
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Photoluminescence and EPR studies on gamma irradiated Ce~3 doped potassium halide single crystals

机译:γ辐照Ce〜3掺杂卤化钾单晶的光致发光和EPR研究

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Electron Paramagnetic Resonance(EPR), Photoluminescence(PL), Thermoluminescence (TL) and other optical studies of γ-irradiated KBr, KCl:Ce~3 single crystals. Cerium when doped into the KBr, KCl is found to enter the host lattice in its trivalent state and act as electron trap during γ-irradiation, thereby partially converting itself to Ce ~2. The Photoluminescence(PL) spectra of both KCl and KBr crystals doped with Ce exhibit the strong blue emissions of Ce corresponding to ~5d(~2D)→~2F_(5/2) and ~5d(~2D)→~2F_(7/2) transitions. The defect centers formed in the Ce~3 doped KBr and KCl. Crystals are studied using the technique of EPR. A dominant TL glow peak at 374, 422 K and KCl:Ce~3 at 466, 475 K is observed in the crystal. EPR studies indicate the presence at two centers at room temperature. Spectral distribution under the thermoluminescence emission(TLE) and optically stimulated emission(OSL) support the idea that defect annihilation process to be due to thermal release of F electron in KBr, KCl:Ce~3 crystals. Both Ce ~3 and Ce~2 emissions were observed in the thermoluminescence emission of the crystals.
机译:γ辐照的KBr,KCl:Ce〜3单晶的电子顺磁共振(EPR),光致发光(PL),热致发光(TL)和其他光学研究。铈掺杂到KBr中时,发现KCl以其三价态进入主体晶格,并在γ辐射过程中充当电子陷阱,从而将其自身部分转化为Ce〜2。掺杂有Ce的KCl和KBr晶体的光致发光(PL)光谱均显示出对应于〜5d(〜2D)→〜2F_(5/2)和〜5d(〜2D)→〜2F_(7)的强Ce蓝光发射/ 2)转换。在Ce〜3掺杂的KBr和KCl中形成缺陷中心。使用EPR技术研究晶体。在晶体中观察到主要的TL辉光峰在374、422 K和KCl:Ce〜3在466、475K。 EPR研究表明,在室温下在两个中心均存在。在热致发光发射(TLE)和光激发发射(OSL)下的光谱分布支持以下观点:缺陷an灭过程归因于KBr,KCl:Ce〜3晶体中F电子的热释放。在晶体的热发光发射中都观察到Ce〜3和Ce〜2发射。

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