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Super stable (Ba,Sr)LuAl2Si2O2N5:Ce3+,Eu2+ phosphors
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2020/02/17 , DOI: 10.1039/c9tc06932a Dawei Wen 1, 2, 3, 4, 5 , Hideki Kato 6, 7, 8, 9 , Masato Kakihana 6, 7, 8, 9
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2020/02/17 , DOI: 10.1039/c9tc06932a Dawei Wen 1, 2, 3, 4, 5 , Hideki Kato 6, 7, 8, 9 , Masato Kakihana 6, 7, 8, 9
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Phosphors suffer from decreasing light output due to degradation on exposure to heat, oxygen and water during the device fabrication process and in the working environment. Here, we report a series of (Ba,Sr)LuAl2Si2O2N5:Ce3+,Eu2+ phosphors which retain their initial luminescence intensity after being annealed in air at up to 800 °C or immersed in water for 5 days. Powder X-ray diffraction for fresh and annealed samples and thermogravimetric/differential thermal analysis confirmed the high stability of the host lattice of (Ba,Sr)LuAl2Si2O2N5. Electron spin resonance showed that the majority of Eu remained in the divalent state even after heating at 800 °C in air. The robust host lattice and stable valence of the activators are responsible for the high stability of (Ba,Sr)LuAl2Si2O2N5:Ce3+,Eu2+ phosphors. The high chemical stability originates from the featured star-like N[(Al/Si)(O/N)3]4 building block and the condensed three dimensional rigid framework. The (Ba,Sr)LuAl2Si2O2N5:Ce3+,Eu2+ phosphors are potential candidates for lighting and display applications, especially for those that need high temperature treatment in the packaging process.
中文翻译：
超稳定（Ba，Sr）LuAl2Si2O2N5：Ce3 +，Eu2 +荧光粉
由于在器件制造过程中以及在工作环境中暴露于热，氧和水后降解，磷光体的光输出降低。在这里，我们报告了一系列（Ba，Sr）LuAl 2 Si 2 O 2 N 5：Ce 3+，Eu 2+荧光粉，它们在空气中退火至800°C或浸入水中后仍保持其初始发光强度5天。新鲜和退火样品的粉末X射线衍射以及热重/差热分析证实了（Ba，Sr）LuAl 2 Si 2 O 2 N 5的主晶格具有很高的稳定性。电子自旋共振表明，即使在空气中在800°C加热后，大多数Eu仍保持二价状态。活化剂的牢固的主晶格和稳定的化合价是（Ba，Sr）LuAl 2 Si 2 O 2 N 5：Ce 3+，Eu 2+荧光粉的高稳定性的原因。高化学稳定性源于具有特色的星形N [（Al / Si）（O / N）3 ] 4结构单元和凝聚的三维刚性骨架。（Ba，Sr）LuAl 2 Si 2 O 2 N 5：Ce 3+，Eu 2+ 磷光体是照明和显示应用的潜在候选者，特别是对于在包装过程中需要高温处理的磷光体。
更新日期：2020-04-03
中文翻译：
超稳定（Ba，Sr）LuAl2Si2O2N5：Ce3 +，Eu2 +荧光粉
由于在器件制造过程中以及在工作环境中暴露于热，氧和水后降解，磷光体的光输出降低。在这里，我们报告了一系列（Ba，Sr）LuAl 2 Si 2 O 2 N 5：Ce 3+，Eu 2+荧光粉，它们在空气中退火至800°C或浸入水中后仍保持其初始发光强度5天。新鲜和退火样品的粉末X射线衍射以及热重/差热分析证实了（Ba，Sr）LuAl 2 Si 2 O 2 N 5的主晶格具有很高的稳定性。电子自旋共振表明，即使在空气中在800°C加热后，大多数Eu仍保持二价状态。活化剂的牢固的主晶格和稳定的化合价是（Ba，Sr）LuAl 2 Si 2 O 2 N 5：Ce 3+，Eu 2+荧光粉的高稳定性的原因。高化学稳定性源于具有特色的星形N [（Al / Si）（O / N）3 ] 4结构单元和凝聚的三维刚性骨架。（Ba，Sr）LuAl 2 Si 2 O 2 N 5：Ce 3+，Eu 2+ 磷光体是照明和显示应用的潜在候选者，特别是对于在包装过程中需要高温处理的磷光体。
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