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Influence of high pressure on Sr_2SiO_4:Eu~(2+) luminescence

机译：高压对Sr_2SiO_4：Eu〜（2+）发光的影响

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Eu~(2+) doped Sr_2SiO_4 phosphors were synthesized by solid state synthesis technique. The purity and crystal structure of the materials was studied with the X-ray powder diffraction. Depending on the synthesis method the materials contain one (α') or two (α' + β) crystal phases. Luminescence properties were studied in UV-Vis range at ambient and high hydrostatic pressure. Two broad emission bands in the yellow-orange and blue-green region were attributed to the 9-fold coordinated and 10-fold coordinated Eu2*, respectively. We found that increasing pressure causes a red shift of the yellow-orange emission. This is typical pressure dependence related to 4f~65d~1→4f~7 transition in Eu~(2+) observed also in other materials. In the case of blue-green band, when pressure increases from ambient to 50 kbar, the emission band shifts strongly to higher energy, and for pressure higher than 50 kbar does not depend on pressure. This effect was considered in framework of crystal field model. We presumed that electrostatic field in a 10-fold coordinated site is a superposition of crystal field of four ligands that belong to tetrahedral coordination and six ligands belonging to octahedral coordination. We discussed untypical pressure dependence of the blue-green emission band as a result of pressure influence on the lower excited state in Eu~(2+), i.e. 4f~65d~1(e) at octahedral and 4f~65d~1(t) at tetrahedral coordination.
机译：采用固态合成技术合成了Eu〜（2+）掺杂的Sr_2SiO_4荧光粉。用X射线粉末衍射研究了材料的纯度和晶体结构。取决于合成方法，材料包含一个（α'）或两个（α'+β）晶相。在环境和高静水压力下在UV-Vis范围内研究了发光特性。黄橙色和蓝绿色区域中的两个宽发射带分别归因于9倍配位和10倍配位的Eu2 *。我们发现压力增加会导致橙黄色发射的红移。这是与其他材料中Eu〜（2+）中4f〜65d〜1→4f〜7转变有关的典型压力依赖性。在蓝绿色带的情况下，当压力从环境压力增加到50 kbar时，发射带会强烈地移动到更高的能量，而对于高于50 kbar的压力，则不依赖于压力。在晶体场模型的框架中考虑了该效应。我们假定静电场在10倍的配位中是四个属于四面体配位体的配体和六个属于八面体配位体的配体的晶体场的叠加。我们讨论了压力对Eu〜（2+）中较低激发态（即八面体4f〜65d〜1（e）和八面体4f〜65d〜1（t）的影响）对蓝绿色发射带的非典型压力依赖性。 ）四面体协调。

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