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Insights into excellent persistent luminescence and detecting trap distribution in BaHfSi3O9:Eu2+,Pr3+
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2017-11-01 00:00:00 , DOI: 10.1039/c7tc03579a Haijie Guo 1, 2, 3, 4, 5 , Yuhua Wang 1, 2, 3, 4, 5 , Gen Li 1, 2, 3, 4, 5 , Jie Liu 1, 2, 3, 4, 5 , Peng Feng 1, 2, 3, 4, 5 , Dongwei Liu 1, 2, 3, 4, 5
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2017-11-01 00:00:00 , DOI: 10.1039/c7tc03579a Haijie Guo 1, 2, 3, 4, 5 , Yuhua Wang 1, 2, 3, 4, 5 , Gen Li 1, 2, 3, 4, 5 , Jie Liu 1, 2, 3, 4, 5 , Peng Feng 1, 2, 3, 4, 5 , Dongwei Liu 1, 2, 3, 4, 5
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A barizite-like compound BaHfSi3O9 (BHS) was tailored to emit intense bluish green persistent luminescence (PersL) above the recognizable intensity level (≥0.32 mcd m−2) lasting for more than 12 h through codoping with Eu2+ and Pr3+. X-ray powder diffraction, the crystal and electronic structures, photoluminescence (PL) and photoluminescence excitation (PLE) were basically studied. Furthermore, decay curves, as well as thermo-luminescence (TL) spectra, were systematically carried out to clarify the mechanism of the PersL. We used the excitation duration, decay duration and excitation temperature dependent TL experiments to estimate the trap density distribution in BHS:Eu2+,Pr3+ phosphor. Based on the above measurements, the 
positive defects could be responsible for the bluish green PersL at room temperature. In the process of PersL, the electrons captured by shallow traps transfer to the Eu2+ levels through a conduction band (CB) which leads to a rapid decay in the early decay stage (t < 3 h), whereas the electrons trapped by deep traps through a quantum tunnelling process result in much slower and nonexponential decay behavior in the later slow-decay stage (t > 3 h). A possible mechanism is proposed for the PersL process in BHS:Eu2+,Pr3+ phosphor.
中文翻译：
BaHfSi 3 O 9：Eu 2 +，Pr 3+中出色的持久发光和检测陷阱分布的见解
调整了重晶石状化合物BaHfSi 3 O 9（BHS）的强度，使其通过与Eu 2+和Eu 2+共掺杂持续超过12小时，从而发出高于可识别强度水平（≥0.32 mcd m -2）的强烈蓝绿色持续发光（PersL）。Pr 3+。基本研究了X射线粉末衍射，晶体和电子结构，光致发光（PL）和光致发光激发（PLE）。此外，系统地进行了衰减曲线以及热发光（TL）光谱，以阐明PersL的机理。我们使用激发持续时间，衰减持续时间和激发温度相关的TL实验来估算BHS：Eu 2 +，Pr中的陷阱密度分布3+磷光体。根据以上测量，在室温下，正缺陷可能是蓝色绿色PersL的原因。在PersL的过程中，被浅陷阱捕获的电子通过导带（CB）转移到Eu 2+能级，导致在衰减的早期阶段（ t <3 h）迅速衰减，而被深陷阱俘获的电子量子隧穿过程中的陷阱会在随后的慢衰减阶段（ t > 3 h）导致慢得多的非指数衰减行为。提出了在BHS：Eu 2 +，Pr 3+荧光粉中进行PersL过程的可能机制。
更新日期：2017-11-16
positive defects could be responsible for the bluish green PersL at room temperature. In the process of PersL, the electrons captured by shallow traps transfer to the Eu2+ levels through a conduction band (CB) which leads to a rapid decay in the early decay stage (t < 3 h), whereas the electrons trapped by deep traps through a quantum tunnelling process result in much slower and nonexponential decay behavior in the later slow-decay stage (t > 3 h). A possible mechanism is proposed for the PersL process in BHS:Eu2+,Pr3+ phosphor.
中文翻译：
BaHfSi 3 O 9：Eu 2 +，Pr 3+中出色的持久发光和检测陷阱分布的见解
调整了重晶石状化合物BaHfSi 3 O 9（BHS）的强度，使其通过与Eu 2+和Eu 2+共掺杂持续超过12小时，从而发出高于可识别强度水平（≥0.32 mcd m -2）的强烈蓝绿色持续发光（PersL）。Pr 3+。基本研究了X射线粉末衍射，晶体和电子结构，光致发光（PL）和光致发光激发（PLE）。此外，系统地进行了衰减曲线以及热发光（TL）光谱，以阐明PersL的机理。我们使用激发持续时间，衰减持续时间和激发温度相关的TL实验来估算BHS：Eu 2 +，Pr中的陷阱密度分布3+磷光体。根据以上测量，
在室温下，正缺陷可能是蓝色绿色PersL的原因。在PersL的过程中，被浅陷阱捕获的电子通过导带（CB）转移到Eu 2+能级，导致在衰减的早期阶段（ t <3 h）迅速衰减，而被深陷阱俘获的电子量子隧穿过程中的陷阱会在随后的慢衰减阶段（ t > 3 h）导致慢得多的非指数衰减行为。提出了在BHS：Eu 2 +，Pr 3+荧光粉中进行PersL过程的可能机制。
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