Orange Persistent Luminescence and Photodarkening Related to Paramagnetic Defects of Nondoped CaO-Ga2O3-GeO2 Glass,The Journal of Physical Chemistry C

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Orange Persistent Luminescence and Photodarkening Related to Paramagnetic Defects of Nondoped CaO-Ga2O3-GeO2 Glass
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2019-11-27 , DOI: 10.1021/acs.jpcc.9b07638
Jumpei Ueda ₁ , Atsunori Hashimoto ₁ , Setsuhisa Tanabe ₁

Affiliation

Orange persistent luminescence and photodarkening phenomena were observed after ultraviolet (UV) excitation in calcium-gallium-germanate (CGG) glass with a composition of 3CaO-1Ga₂O₃-3GeO₂ prepared by a melt-quenching method. The CGG glass was characterized by using X-ray diffraction, differential scanning calorimetry, and Raman scattering analyses. Also, the optical and electronic properties of the CGG glass were investigated. Based on the electron paramagnetic resonance (EPR) spectra, it is found that new defects, NBOHC (nonbridging oxygen hole center) and E’(Ge) (unpaired electron at Ge ion bonding three oxygen), were created after UV excitation. From the good agreement between the time dependence of the photodarkening absorption intensity and EPR intensity of the NBOHC, the origin of the photodarkening phenomenon is found to be caused by NBOHC. Also, from the relationship between the time dependence of persistent luminescence intensity and the time-derivative EPR intensities of NBOHC and E’(Ge) centers, the persistent luminescence is found to be caused by the recombination process between these two different defects.

中文翻译：

与未掺杂CaO-Ga ₂ O ₃ -GeO ₂玻璃的顺磁缺陷相关的橙色持久发光和光暗化

在组成为3CaO-1Ga ₂ O ₃ -3GeO ₂的锗酸钙-镓锗酸盐（CGG）玻璃中，在紫外线（UV）激发后，观察到橙色持续发光和光暗化现象。通过熔融淬火法制备。通过使用X射线衍射，差示扫描量热法和拉曼散射分析来表征CGG玻璃。此外，还研究了CGG玻璃的光学和电子性能。根据电子顺磁共振（EPR）光谱，发现在紫外线激发后会产生新的缺陷，NBOHC（非桥氧空穴中心）和E'（Ge）（Ge离子与三个氧键合的未配对电子）。根据光暗化吸收强度的时间依赖性和NBOHC的EPR强度之间的良好一致性，发现光暗化现象的根源是NBOHC引起的。此外，从持续发光强度的时间依赖性与NBOHC和E'（Ge）中心的时间导数EPR强度之间的关系，

更新日期：2019-11-28

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