文章基本信息

标题：A Strategy to enhance Eu3+ emission from LiYF4:Eu nanophosphors and green-to-orange multicolor tunable, transparent nanophosphor-polymer composites
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作者：Su Yeon Kim ; Yu-Ho Won ; Ho Seong Jang 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2015
卷号：5
期号：1
DOI：10.1038/srep07866
语种：English
出版社：Springer Nature
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 →⁷F_J (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.