A Strategy to enhance Eu3+ emission from LiYF4:Eu nanophosphors and green-to-orange multicolor tunable, transparent nanophosphor-polymer composites
- A Strategy to enhance Eu3+ emission from LiYF4:Eu nanophosphors and green-to-orange multicolor tunable, transparent nanophosphor-polymer composites
- 김수연; 원유호; 장호성
- nanophosphors; color tuning; core/shell; nanocomposites; luminescence
- Issue Date
- Scientific Reports
- VOL 5, NO 7866, 1-8
- LiYF4:Eu nanophosphors with a single tetragonal phase are synthesized, and various strategies to enhance the Eu31 emission from the nanophosphors are investigated. The optimized Eu31 concentration is 35 mol%, and the red emission peaks due to the 5D0R7FJ (J51 and 2) transitions of Eu31 ions are further enhanced by energy transfer from a sensitizer pair of Ce31 and Tb31. The triple doping of Ce, Tb, and Eu into the LiYF4 host more effectively enhances the Eu31 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 Ce31 to Eu31 through Tb31 results in three times higher Eu31 emission intensity from LiYF4:Ce(15%), Tb(15%), Eu(1%) nanophosphors compared with LiYF4:Eu(35%), which contains the optimized Eu31 concentration. Owing to the energy transfer of Ce31 R Tb31 and Ce31 R Tb31 R Eu31,
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 Eu31 concentration. With increasing Eu31 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.
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