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首页> 外文期刊>Advanced Functional Materials >Electrochromic Switch Devices Mixing Small- and Large-Sized U peon verting Nanocrystals
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Electrochromic Switch Devices Mixing Small- and Large-Sized U peon verting Nanocrystals

机译：电致变色开关设备，混合了小型和大型的U-Peon纳米晶体

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摘要

The hasty progress in smart, portable, flexible, and transparent integrated electronics and optoelectronics is currently one of the driving forces in nanoscience and nanotechnology. A promising approach is the combination of transparent conducting electrode materials (e.g., silver nanowires, AgNWs) and upconverting nanoparticles (UCNPs). Here, electrochromic devices based on transparent nanocomposite films of poly(methyl methacrylate) and AgNWs covered by UCNPs of different sizes and compositions are developed. By combining the electrical control of the heat dissipation in AgNW networks with size-dependent thermal properties of UCNPs, tunable electrochromic transparent devices covering a broad range of the chromatic diagrams are fabricated. As illustrative examples, devices mixing large-sized (70 nm) beta-NaYF4:Yb,Ln and small-sized (15 nm) NaGdF4:Yb,Ln@NaYF4 core@shell UCNPs (Ln = Tm, Er, Ce/Ho) are presented, permitting to monitor the temperature-dependent emission of the particles by the intensity ratio of the Er3+ 2H11/2 and S-4(3/2) - I-4(15/2) emission lines, while externally controlling the current flow in the AgNW network. Moreover, by defining a new thermometric parameter involving the intensity ratio of transitions of large- and small-sized UCNPs, a relative thermal sensitivity of 5.88% K-1 (at 339 K) is obtained, a sixfold improvement over the values reported so far.
机译：智能，便携式，灵活和透明的集成电子学和光电子学的急速发展是当前纳米科学和纳米技术的推动力之一。一种有前途的方法是将透明导电电极材料（例如，银纳米线，AgNW）和上转换纳米颗粒（UCNP）结合在一起。在此，开发了基于聚甲基丙烯酸甲酯和被不同大小和组成的UCNP覆盖的AgNW的透明纳米复合膜的电致变色器件。通过将AgNW网络中的散热电子控制与UCNPs的尺寸相关热性能相结合，可制造出覆盖色度图范围广的可调电致变色透明器件。作为说明性示例，设备将大型（> 70 nm）β-NaYF4：Yb，Ln和小型（<15 nm）NaGdF4：Yb，Ln @ NaYF4核@壳UCNP混合（Ln = Tm，Er，Ce / Ho）被提出，允许通过Er3 + 2H11 / 2和S-4（3/2）-> I-4（15/2）发射线的强度比来监视颗粒的温度相关发射控制AgNW网络中的电流。此外，通过定义一个涉及大型和小型UCNP跃迁强度比的新测温参数，相对热敏度为5.88％K-1（在339 K下），是迄今为止报道值的六倍。

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