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2024年4月嘲风作品集（一）

已有 871 次阅读 2024-6-25 14:32 |个人分类:作品发表|系统分类:论文交流

▲ Vol 03 Issue 02 | April, 2024

Study on the energy level limitations of triplet-triplet annihilation upconversion with anthracene-isomerized dimers as annihilators

Shanshan Liu, Tingting Gou, Xiaojuan Song, Riming Hu, Heyuan Liu, Xiyou Li, Xuchuan Jiang

The enhancement in the efficiency of triplet-triplet annihilation upconversion (TTA-UC) is mainly determined by the triplet energy transfer (TET) and triplet-triplet annihilation (TTA) between the sensitizers and annihilators. The TET process works efficiently by adjusting the concentration ratio of the sensitizers and annihilators. The efficiency of TTA is determined by the properties of the annihilator. Because TTA is a Dexter-type energy transfer and is affected by the diffusion rate, the energy levels of the excited states and the molecular size are both crucial in TTA. In this study, four isomerized dimers of 9,10-diphenlanthracene (DPA) and anthracene (An) were designed and prepared as annihilators for TTA-UC. The singlet and triplet energy levels could be adjusted by altering the connection position while maintaining the molecular weight and size. When PtOEP was used as the sensitizer, the maximum upconversion efficiency of 9-[4-(9-anthracenyl)phenyl]-10-phenylanthracene (9DPA-9An) was ∼11.18%. This is four times higher than that of 9,10-diphenyl-2,9′-bianthracene (2DPA-9An, 2.63%). The calculation of the energies of T1 and the higher triplet state (T3, because E(T2) is similar to the E(T1) of these dimers) for these dimers has provided insights into the underlying reasons. These indicated that the energy gap value of 2 × E(T1) − E(T3) is the determining factor for TTA efficiency. This work may provide a better understanding of the excited-state energy levels, which is crucial for designing novel annihilators to enhance the TTA-UC efficiency.

https://www.sciencedirect.com/science/article/pii/S2772571524000019

▲ Vol 33 Issue 04 | April, 2024

Co-doped BaFe2As2 Josephson junction fabricated with a focused helium ion beam

Ziwen Chen(陈紫雯), Yan Zhang(张焱), Ping Ma(马平), Zhongtang Xu(徐中堂), Yulong Li(李宇龙), Yue Wang(王越), Jianming Lu(路建明), Yanwei Ma(马衍伟), and Zizhao Gan(甘子钊)

Josephson junction plays a key role not only in studying the basic physics of unconventional iron-based superconductors but also in realizing practical application of thin-film based devices, therefore the preparation of high-quality iron pnictide Josephson junctions is of great importance. In this work, we have successfully fabricated Josephson junctions from Co-doped BaFe2As2 thin films using a direct junction fabrication technique which utilizes high energy focused helium ion beam (FHIB). The electrical transport properties were investigated for junctions fabricated with various He+ irradiation doses. The junctions show sharp superconducting transition around 24 K with a narrow transition width of 2.5 K, and a dose correlated foot-structure resistance which corresponds to the effective tuning of junction properties by He+ irradiation. Significant Jc suppression by more than two orders of magnitude can be achieved by increasing the He+ irradiation dose, which is advantageous for the realization of low noise ion pnictide thin film devices. Clear Shapiro steps are observed under 10 GHz microwave irradiation. The above results demonstrate the successful fabrication of high quality and controllable Co-doped BaFe2As2 Josephson junction with high reproducibility using the FHIB technique, laying the foundation for future investigating the mechanism of iron-based superconductors, and also the further implementation in various superconducting electronic devices.

https://cpb.iphy.ac.cn/EN/10.1088/1674-1056/ad21f7

▲ Vol 20 Issue 14 | 04 April, 2024

Flexible Block Copolymer Metamaterials Featuring Hollow Ordered Nanonetworks with Ultra-High Porosity and Surface-To-Volume Ratio

I-Ming Lin, Chih-Ying Yang, Yi-Ming Wang, Wei-En Wang, Yu-Chueh Hung, Edwin L. Thomas, Yeo-Wan Chiang

Flexible Block Copolymer Metamaterials

In article number 2307487, Yeo-Wan Chiang and co-workers developed dual extractable nanocomposites capable of creating a novel hollow gyroid (HG) featuring maximum porosity, low reflectivity, and high specific reduced modulus. Owing to the highly interconnected and ordered nanonetworks, the pioneering HG is promising as a nanoreactor for developing ultra-lightweight and robust nanomaterials for aerospace, catalysis, and energy applications.

https://onlinelibrary.wiley.com/doi/10.1002/smll.202470114

▲ Vol 51 Issue 07 | 11 April, 2024

基于高次谐波的高功率高稳定13.5 nm极紫外光源

李逵, 孟润宇, 李睿晅, 张光银, 姚铭杰, 徐豪, 王雨童, 李捷, 张晓世, 仲维

开发了由高重复频率（3 kHz）高能量（3 mJ）钛蓝宝石激光器驱动的极紫外和软X射线高次谐波激光光源。该光源系统在30 nm（光子能量为~45 eV）波长附近实现了大于120 μW的平均功率，在13.46 nm波长（光子能量为~92 eV）处实现了1.9 μW的平均功率，其中在13.46 nm波长处带宽为0.124 nm的单个谐波实现了0.32 μW的平均功率。此外，在该系统中，激光功率连续12 h的不稳定性均方根小于5%，连续8 h光束指向均方根小于10 µrad。该系统在生物成像、干涉光刻和芯片检测等领域中具有重要应用。

https://www.opticsjournal.net/Articles/OJfdd3bb2cf5bd129f/Abstract

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