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Performance Improvement of Triplet–Triplet Annihilation-Based Upconversion Solid Films through Plasmon-Induced Backward Scattering of Periodic Arrays of Ag and Al
Langmuir ( IF 3.7 ) Pub Date : 2021-09-20 , DOI: 10.1021/acs.langmuir.1c01770 Kosuke Sugawa 1 , Satoshi Yoshinari 1 , Shiryu Watanabe 1 , Kosuke Ishida 1 , Shota Jin 1 , Naoto Takeshima 1 , Toru Fukasawa 1 , Misa Fukushima 2 , Ryuzi Katoh 2 , Kouichi Takase 3 , Hironobu Tahara 4 , Joe Otsuki 1
Langmuir ( IF 3.7 ) Pub Date : 2021-09-20 , DOI: 10.1021/acs.langmuir.1c01770 Kosuke Sugawa 1 , Satoshi Yoshinari 1 , Shiryu Watanabe 1 , Kosuke Ishida 1 , Shota Jin 1 , Naoto Takeshima 1 , Toru Fukasawa 1 , Misa Fukushima 2 , Ryuzi Katoh 2 , Kouichi Takase 3 , Hironobu Tahara 4 , Joe Otsuki 1
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The performance improvement of solid-state triplet–triplet annihilation-based photon upconversion (TTA-UC) systems is required for the application to various solar devices. The performance can be improved by making use of the local strong electric field generated through the excitation of localized surface plasmon (LSP) resonance of metal nanostructures. However, since the improvement is effective only within the limited nanospace around nanoparticles (i.e., the near-field effect), a methodology for improving the performance over a wider spatial region is desirable. In this study, a significant improvement in the threshold light excitation intensity (Ith) (77% decrease) as the figure of merit and the upconverted emission intensity (6.3 times enhancement) in a solid-state TTA-UC film with a thickness of 3 μm was achieved by stacking the film with periodic Ag half-shell arrays. The highest-enhanced upconverted emission was obtained by tuning the diffuse reflectance peak, which results from the excitation of LSP resonance of the Ag half-shell arrays, to overlap well with the photoexcitation peak of the sensitizer in the TTA-UC film. The intensity of the enhanced upconverted emission was independent of the distance between the lower edge of the TTA-UC film and the surface of half-shell arrays in the nanometer order. These results suggest that the performance improvement was attributed to the photoexcitation enhancement of the sensitizer by elongating the excitation light path length inside the TTA-UC film, which was achieved through a strong backward scattering of the incident light based on the LSP resonance excitation (i.e., the far-field effect). In addition, the upconverted emission was improved using half-shell arrays comprising low-cost Al, although the enhancement factor was 3.5, which was lower than that of Ag half-shell arrays. The lower enhancement may be attributed to a decrease in the backward scattering of the excitation light owing to the intrinsic strong interband transition of Al at long visible wavelengths.
中文翻译：
通过等离子体诱导的 Ag 和 Al 周期阵列的反向散射改善基于三重态-三重态湮灭的上转换固体薄膜的性能
基于固态三重态-三重态湮灭的光子上转换（TTA-UC）系统的性能改进是各种太阳能设备应用所必需的。通过利用金属纳米结构的局域表面等离子体 (LSP) 共振激发产生的局部强电场可以提高性能。然而，由于改进仅在纳米粒子周围的有限纳米空间内有效（即，近场效应），因此需要在更宽的空间区域上改进性能的方法。在本研究中，阈值光激发强度（I th)（降低 77%）作为品质因数和厚度为 3 μm 的固态 TTA-UC 膜的上转换发射强度（增强 6.3 倍）是通过将膜与周期性 Ag 半壳阵列堆叠来实现的。最高增强的上转换发射是通过调整漫反射峰获得的，漫反射峰是由 Ag 半壳阵列的 LSP 共振激发引起的，与 TTA-UC 膜中敏化剂的光激发峰很好地重叠。增强的上转换发射的强度与 TTA-UC 膜下边缘与纳米级半壳阵列表面之间的距离无关。即远场效应）。此外，使用包含低成本铝的半壳阵列改善了上转换发射，尽管增强因子为 3.5，低于银半壳阵列。较低的增强可能是由于 Al 在长可见光波长下固有的强带间跃迁导致激发光的后向散射减少。
更新日期：2021-10-06
中文翻译：
通过等离子体诱导的 Ag 和 Al 周期阵列的反向散射改善基于三重态-三重态湮灭的上转换固体薄膜的性能
基于固态三重态-三重态湮灭的光子上转换（TTA-UC）系统的性能改进是各种太阳能设备应用所必需的。通过利用金属纳米结构的局域表面等离子体 (LSP) 共振激发产生的局部强电场可以提高性能。然而，由于改进仅在纳米粒子周围的有限纳米空间内有效（即，近场效应），因此需要在更宽的空间区域上改进性能的方法。在本研究中，阈值光激发强度（I th)（降低 77%）作为品质因数和厚度为 3 μm 的固态 TTA-UC 膜的上转换发射强度（增强 6.3 倍）是通过将膜与周期性 Ag 半壳阵列堆叠来实现的。最高增强的上转换发射是通过调整漫反射峰获得的，漫反射峰是由 Ag 半壳阵列的 LSP 共振激发引起的，与 TTA-UC 膜中敏化剂的光激发峰很好地重叠。增强的上转换发射的强度与 TTA-UC 膜下边缘与纳米级半壳阵列表面之间的距离无关。即远场效应）。此外，使用包含低成本铝的半壳阵列改善了上转换发射，尽管增强因子为 3.5，低于银半壳阵列。较低的增强可能是由于 Al 在长可见光波长下固有的强带间跃迁导致激发光的后向散射减少。
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