Highly improved upconversion luminescence in NaGd(WO₄)₂:Yb³⁺/Tm³⁺ inverse opal photonic crystals.
Highly improved upconversion luminescence in NaGd(WO₄)₂:Yb³⁺/Tm³⁺ inverse opal photonic crystals.
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DOI：
10.1039/c4nr05688d
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发表时间：
2015-01
期刊：
影响因子：
6.7
通讯作者：
Yunfeng Wang;Wen Xu;Shaobo Cui;Sai Xu;Ze Yin;Hongwei Song;Pingwei Zhou;Xiaoyang Liu;Lin Xu
中科院分区：
文献类型：
--
作者：
Yunfeng Wang;Wen Xu;Shaobo Cui;Sai Xu;Ze Yin;Hongwei Song;Pingwei Zhou;Xiaoyang Liu;Lin Xu
稀土(RE)掺杂纳米材料的上转换发光(UCL)因其广泛而潜在的应用而引起了人们的广泛兴趣。然而，UCL效率较低仍然是实际应用的障碍。光子调制是提高UCL效率的一种新方法。本工作以聚甲基丙烯酸甲酯(PMMA)为模板制备了NaGd(WO4)2：Yb(3+)/Tm(3+)反蛋白石光子晶体，系统研究了IOPC结构对Tm(3+)离子发射光谱和动力学的影响。有趣的是，在IOPC中，高阶UCL(1)D2-(3)H6/(3)F4相对增强。同时，抑制了激光照射引起的局部热效应。此外，可见UCL与近红外(NIR)下转换发光(DCL)的总强度比(DCL)比研磨参考(REF)提高了2.8-8倍，且与光子阻带(PSB)无关。UCL动力学研究表明，Tm(3+)的非辐射跃迁速率明显受到抑制。上述事实表明，在IOPC中，由于周期性的大孔结构，Tm(3+)的UCL效率大大提高。
The upconversion luminescence (UCL) of rare earth (RE) ions doped nanomaterials has attracted extensive interest because of its wide and great potential applications. However, the lower UCL efficiency is still an obstacle for real applications. Photonic modulation is a novel way to improve the efficiency of UCL. In this work, NaGd(WO4)2:Yb(3+)/Tm(3+) inverse opal photonic crystals (IOPCs) were fabricated through the polymethylmethacrylate (PMMA) template and the modification of the IOPC structure on the emission spectra and dynamics of Tm(3+) ions was systemically studied. It is interesting to observe that in the IOPCs, the high-order UCL (1)D2-(3)H6/(3)F4 was relatively enhanced. At the same time, the local thermal effect induced by laser irradiation was suppressed. Furthermore, the overall intensity ratio of visible UCL to near-infrared (NIR) down-conversion luminescence (DCL) was 2.8-8 times improved than that of the grinded reference (REF) and independent of the photonic stop band (PSB). The studies on UCL dynamics indicated that the nonradiative transition rate of Tm(3+) was considerably suppressed. The facts above indicated that in the IOPCs the UCL efficiency of Tm(3+) was largely improved due to the periodic macroporous structure.