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Formation of Deep Electron Traps by Yb3+ Codoping Leads to Super-Long Persistent Luminescence in Ce3+-Doped Yttrium Aluminum Gallium Garnet Phosphors
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-05-23 00:00:00 , DOI: 10.1021/acsami.8b02758 Jumpei Ueda 1 , Shun Miyano 1 , Setsuhisa Tanabe 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-05-23 00:00:00 , DOI: 10.1021/acsami.8b02758 Jumpei Ueda 1 , Shun Miyano 1 , Setsuhisa Tanabe 1
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The Y3Al2Ga3O12:Ce3+–Cr3+ compound is one of the brightest persistent phosphors, but its persistent luminescence duration is not so long because of the relatively shallow Cr3+ electron trap. To compare the vacuum referred binding energy of the electron trapping state by Cr3+ and lanthanide ions, we selected Yb3+ as a deeper electron trapping center. The Y3Al2Ga3O12:Ce3+–Yb3+ phosphors show Ce3+:5d → 4f green persistent luminescence after blue light excitation. The formation of Yb2+ was confirmed by the increased intensity of absorption due to Yb2+:4f−5d at 585 nm during the charging process. This result indicates that the Yb3+ ions act as electron traps by capturing an electron. From the thermoluminescence glow curves, it was found that the Yb3+ trap makes a much deeper electron trap with a 1.01 eV depth than the Cr3+ electron trap with a 0.81 eV depth. This deeper Yb3+ trap provides a much slower detrapping rate of filled electron traps than the Cr3+-codoped persistent phosphor. In addition, by preparing transparent ceramics and optimizing Ce3+ and Yb3+ concentrations, the Y3Al2Ga3O12:Ce3+(0.2%)–Yb3+(0.1%) as-made transparent ceramic phosphor showed super-long persistent luminescence for over 138.8 h after blue light charging.
中文翻译：
Yb 3+共掺杂形成深电子陷阱导致Ce 3+掺杂钇铝镓石榴石荧光粉超持久发光。
Y 3 Al 2 Ga 3 O 12：Ce 3+ -Cr 3+化合物是最亮的持久性磷光体之一，但由于Cr 3+电子陷阱相对较浅，其持久发光持续时间并不长。为了比较Cr 3+和镧系元素离子在真空中的电子俘获态结合能，我们选择Yb 3+作为更深的电子俘获中心。Y 3 Al 2 Ga 3 O 12：Ce 3+ –Yb 3+荧光粉显示Ce 3+：5d→4f蓝光激发后，绿色持续发光。在充电过程中，由于在585 nm处的Yb 2+：4f-5d引起的吸收强度增加，证实了Yb 2+的形成。该结果表明，Yb 3+离子通过捕获电子而充当电子陷阱。从热致发光辉光曲线发现，Yb 3+陷阱的电子陷阱深度为1.01 eV，比Cr 3+电子陷阱的电子陷阱深度为0.81 eV。与Cr 3+掺杂的持久性磷光体相比，这种更深的Yb 3+陷阱提供了填充电子陷阱的解吸速率慢得多。此外，通过制备透明陶瓷和优化铈3 +和Yb 3+浓度下，Y 3 Al 2 Ga 3 O 12：Ce 3+（0.2％）– Yb 3+（0.1％）制成的透明陶瓷磷光体在经过138.8 h后显示超长持续发光蓝光充电。
更新日期：2018-05-23
中文翻译：
Yb 3+共掺杂形成深电子陷阱导致Ce 3+掺杂钇铝镓石榴石荧光粉超持久发光。
Y 3 Al 2 Ga 3 O 12：Ce 3+ -Cr 3+化合物是最亮的持久性磷光体之一，但由于Cr 3+电子陷阱相对较浅，其持久发光持续时间并不长。为了比较Cr 3+和镧系元素离子在真空中的电子俘获态结合能，我们选择Yb 3+作为更深的电子俘获中心。Y 3 Al 2 Ga 3 O 12：Ce 3+ –Yb 3+荧光粉显示Ce 3+：5d→4f蓝光激发后，绿色持续发光。在充电过程中，由于在585 nm处的Yb 2+：4f-5d引起的吸收强度增加，证实了Yb 2+的形成。该结果表明，Yb 3+离子通过捕获电子而充当电子陷阱。从热致发光辉光曲线发现，Yb 3+陷阱的电子陷阱深度为1.01 eV，比Cr 3+电子陷阱的电子陷阱深度为0.81 eV。与Cr 3+掺杂的持久性磷光体相比，这种更深的Yb 3+陷阱提供了填充电子陷阱的解吸速率慢得多。此外，通过制备透明陶瓷和优化铈3 +和Yb 3+浓度下，Y 3 Al 2 Ga 3 O 12：Ce 3+（0.2％）– Yb 3+（0.1％）制成的透明陶瓷磷光体在经过138.8 h后显示超长持续发光蓝光充电。
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