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A Strategy to enhance Eu3+ emission from LiYF4:Eu nanophosphors and green-to-orange multicolor tunable transparent nanophosphor-polymer composites

机译:增强LiYF4:Eu纳米磷光体和绿色至橙色多色可调透明纳米磷光体-聚合物复合材料的Eu3 +发射的策略

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摘要

LiYF4:Eu nanophosphors with a single tetragonal phase are synthesized, and various strategies to enhance the Eu3+ emission from the nanophosphors are investigated. The optimized Eu3+ concentration is 35 mol%, and the red emission peaks due to the 5D0 →7FJ (J = 1 and 2) transitions of Eu3+ ions are further enhanced by energy transfer from a sensitizer pair of Ce3+ and Tb3+. The triple doping of Ce, Tb, and Eu into the LiYF4 host more effectively enhances the Eu3+ emission than the core/shell strategies of LiYF4:Eu(35%)/LiYF4:Ce(15%), Tb(15%) and LiYF4:Ce(15%), Tb(15%)/LiYF4:Eu(35%) architectures. Efficient energy transfer from Ce3+ to Eu3+ through Tb3+ results in three times higher Eu3+ emission intensity from LiYF4:Ce(15%), Tb(15%), Eu(1%) nanophosphors compared with LiYF4:Eu(35%), which contains the optimized Eu3+ concentration. Owing to the energy transfer of Ce3+ → Tb3+ and Ce3+ → Tb3+ → Eu3+, intense green and red emission peaks are observed from LiYF4:Ce(13%), Tb(14%), Eu(1-5%) (LiYF4:Ce, Tb, Eu) nanophosphors, and the intensity ratio of green to red emission is controlled by adjusting the Eu3+ concentration. With increasing Eu3+ concentration, the LiYF4:Ce, Tb, Eu nanophosphors exhibit multicolor emission from green to orange. In addition, the successful incorporation of LiYF4:Ce, Tb, Eu nanophosphors into polydimethylsiloxane (PDMS) facilitates the preparation of highly transparent nanophosphor-PDMS composites that present excellent multicolor tunability.
机译:合成了具有单四方相的LiYF4:Eu纳米磷光体,并研究了各种增强纳米磷光体Eu 3 + 发射的策略。优化的Eu 3 + 浓度为35 mol%,红色发射峰是 5 D0→ 7 FJ引起的(J = 1和2)Eu 3 + 离子的跃迁通过Ce 3 + 和Tb 3 + 敏化剂对的能量转移而得到进一步增强。与LiYF4:Eu(35%)/ LiYF4:Ce(15%)的核/壳策略相比,向LiYF4主体中三重掺杂Ce,Tb和Eu可以更有效地增强Eu 3 + 发射。 ),Tb(15%)和LiYF4:Ce(15%),Tb(15%)/ LiYF4:Eu(35%)架构。通过Tb 3 + 从Ce 3 + 到Eu 3 + 的有效能量转移导致Eu 3 + 3 + 浓度。由于Ce 3 + →Tb 3 + 和Ce 3 + →Tb 3 + →的能量转移从LiYF4:Ce(13%),Tb(14%),Eu(1-5%)(LiYF4:Ce,Tb,Eu)观察到Eu 3 + ,强烈的绿色和红色发射峰纳米磷光体,通过调节Eu 3 + 的浓度来控制绿色与红色发射的强度比。随着Eu 3 + 浓度的增加,LiYF4:Ce,Tb,Eu纳米磷光体呈现出从绿色到橙色的多色发射。此外,成功将LiYF4:Ce,Tb,Eu纳米磷光体并入聚二甲基硅氧烷(PDMS)有助于制备具有优异多色可调性的高度透明的纳米磷光体-PDMS复合材料。

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