UV-vis induced emission-color switching in Eu-doped BaNa2MgP2O8
UV-vis induced emission-color switching in Eu-doped BaNa2MgP2O8
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DOI：
10.1016/j.jallcom.2022.168007
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发表时间：
2022-11
影响因子：
6.2
通讯作者：
Yoshinori Yonezaki
中科院分区：
文献类型：
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作者：
Yoshinori Yonezaki
本文通过掺杂的铕离子的光氧化还原反应证明了BaNa2MgP2O8: Eu的发射色变化。采用高温固相反应在空气中制备了掺铕的bana2mgp2o8。在紫外激发下，铕掺杂的bana2mgp2o8表现出微弱的混合色发射，包含橙色和蓝色成分。它们分别来源于Eu3+中的4个f6 ~ 4个f6组内电子跃迁和Eu2+中的4个f65d1 ~ 4个f7组间电子跃迁。由于Eu3+光氧化还原反应都是由紫外-可见光刺激促成的，因此Eu3+/Eu2+的比值随刺激波长的不同而接近平衡值。所得到的发射颜色在刺激光的作用下连续变化。光吸收特性和ESR谱分析表明，在BaNa2MgP2O8中，Eu和po43之间的电子转移引起了Eu中的光氧化还原反应。
This paper demonstrates emission-color change of BaNa2MgP2O8: Eu through photoredox reactions of dopant europium ions. Europium doped BaNa2MgP2O8was prepared by high-temperature solid state reaction in air. Under UV excitation, Eu-doped BaNa2MgP2O8exhibited weak mixed-color emission involving orange and blue components. They were derived from 4 f6-4 f6intraconfigurational electron transition in Eu3+and 4 f65d1-4 f7interconfigurational electron transition in Eu2+, respectively. Since Eu3+⇄ Eu2+photoredox reactions were both facilitated by UV–vis photostimulation, Eu3+/Eu2+ratio approached to an equilibrium value depending on the stimulation wavelength. The resultant emission color was continuously varied by stimulation light. Optical absorption character and ESR spectroscopy revealed that the photoredox reactions in Eu were caused by electron transfer between Eu and PO43-within BaNa2MgP2O8.