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Start Over Author "Wu, Yilei" Journal journal of the american chemical society
33 results on '"Wu, Yilei"'

3. Correction to “A Design Strategy for Intrinsically Stretchable High-Performance Polymer Semiconductors: Incorporating Conjugated Rigid Fused-Rings with Bulky Side Groups”

Author

Liu, Deyu, primary, Mun, Jaewan, additional, Chen, Gan, additional, Schuster, Nathaniel J., additional, Wang, Weichen, additional, Zheng, Yu, additional, Nikzad, Shayla, additional, Lai, Jian-Cheng, additional, Wu, Yilei, additional, Zhong, Donglai, additional, Lin, Yangju, additional, Lei, Yusheng, additional, Chen, Yuelang, additional, Park, Jeong-Il, additional, Gam, Sangah, additional, Chung, Jong Won, additional, Yun, Youngjun, additional, Tok, Jeffrey B.-H., additional, and Bao, Zhenan, additional

Published
2021
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4. A Design Strategy for Intrinsically Stretchable High-Performance Polymer Semiconductors: Incorporating Conjugated Rigid Fused-Rings with Bulky Side Groups

Author

Liu, Deyu, primary, Mun, Jaewan, additional, Chen, Gan, additional, Schuster, Nathaniel J., additional, Wang, Weichen, additional, Zheng, Yu, additional, Nikzad, Shayla, additional, Lai, Jian-Cheng, additional, Wu, Yilei, additional, Zhong, Donglai, additional, Lin, Yangju, additional, Lei, Yusheng, additional, Chen, Yuelang, additional, Gam, Sangah, additional, Chung, Jong Won, additional, Yun, Youngjun, additional, Tok, Jeffrey B.-H., additional, and Bao, Zhenan, additional

Published
2021
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8. ExTzBox: A Glowing Cyclophane for Live-Cell Imaging

Author

Roy, Indranil, primary, Bobbala, Sharan, additional, Zhou, Jiawang, additional, Nguyen, Minh T., additional, Nalluri, Siva Krishna Mohan, additional, Wu, Yilei, additional, Ferris, Daniel P., additional, Scott, Evan Alexander, additional, Wasielewski, Michael R., additional, and Stoddart, J. Fraser, additional

Published
2018
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9. Hybrid Dion–Jacobson 2D Lead Iodide Perovskites

Author

Mao, Lingling, primary, Ke, Weijun, additional, Pedesseau, Laurent, additional, Wu, Yilei, additional, Katan, Claudine, additional, Even, Jacky, additional, Wasielewski, Michael R., additional, Stoumpos, Constantinos C., additional, and Kanatzidis, Mercouri G., additional

Published
2018
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10. X-Shaped Oligomeric Pyromellitimide Polyradicals

Author

Wu, Yilei, primary, Han, Ji-Min, additional, Hong, Michael, additional, Krzyaniak, Matthew D., additional, Blackburn, Anthea K., additional, Fernando, Isurika R., additional, Cao, Dennis D., additional, Wasielewski, Michael R., additional, and Stoddart, J. Fraser, additional

Published
2017
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12. Mechanical-Bond-Protected, Air-Stable Radicals

Author

Sun, Junling, primary, Liu, Zhichang, additional, Liu, Wei-Guang, additional, Wu, Yilei, additional, Wang, Yuping, additional, Barnes, Jonathan C., additional, Hermann, Keith R., additional, Goddard, William A., additional, Wasielewski, Michael R., additional, and Stoddart, J. Fraser, additional

Published
2017
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15. Intramolecular Energy and Electron Transfer within a Diazaperopyrenium-Based Cyclophane

Author

Gong, Xirui, primary, Young, Ryan M., additional, Hartlieb, Karel J., additional, Miller, Claire, additional, Wu, Yilei, additional, Xiao, Hai, additional, Li, Peng, additional, Hafezi, Nema, additional, Zhou, Jiawang, additional, Ma, Lin, additional, Cheng, Tao, additional, Goddard, William A., additional, Farha, Omar K., additional, Hupp, Joseph T., additional, Wasielewski, Michael R., additional, and Stoddart, J. Fraser, additional

Published
2017
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16. Size-Matched Radical Multivalency

Author

Lipke, Mark C., primary, Cheng, Tao, additional, Wu, Yilei, additional, Arslan, Hasan, additional, Xiao, Hai, additional, Wasielewski, Michael R., additional, Goddard, William A., additional, and Stoddart, J. Fraser, additional

Published
2017
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18. Fine-Tuning Semiconducting Polymer Self-Aggregation and Crystallinity Enables Optimal Morphology and High-Performance Printed All-Polymer Solar Cells

Author

Wu, Yilei, Schneider, Sebastian, Walter, Christopher, Chowdhury, Ashraful Haider, Bahrami, Behzad, Wu, Hung-Chin, Qiao, Qiquan, Toney, Michael F., and Bao, Zhenan

Abstract

Polymer aggregation and crystallization behavior play a crucial role in the performance of all-polymer solar cells (all-PSCs). Gaining control over polymer self-assembly via molecular design to influence bulk-heterojunction active-layer morphology, however, remains challenging. Herein, we show a simple yet effective way to modulate the self-aggregation of the commonly used naphthalene diimide (NDI)-based acceptor polymer (N2200), by systematically replacing a certain amount of alkyl side-chains with compact bulky side-chains (CBS). Specifically, we have synthesized a series of random copolymer (PNDI-CBSx) with different molar fractions (x= 0–1) of the CBS units and have found that both solution-phase aggregation and solid-state crystallinity of these acceptor polymers are progressively suppressed with increasing xas evidenced by UV–vis absorption, photoluminescence (PL) spectroscopies, thermal analysis, and grazing incidence X-ray scattering (GIWAXS) techniques. Importantly, as compared to the highly self-aggregating N2200, photovoltaic results show that blending of more amorphous acceptor polymers with donor polymer (PBDB-T) can enable all-PSCs with significantly increased PCE (up to 8.5%). The higher short-circuit current density (Jsc) results from the smaller polymer phase-separation domain sizes as evidenced by PL quenching and resonant soft X-ray scattering (R-SoXS) analyses. Additionally, we show that the lower crystallinity of the active layer is less sensitive to the film deposition methods. Thus, the transition from spin-coating to solution coating can be easily achieved with no performance losses. On the other hand, decreasing aggregation and crystallinity of the acceptor polymer too much reduces the photovoltaic performance as the donor phase-separation domain sizes increases. The highly amorphous acceptor polymers appear to induce formation of larger donor polymer crystallites. These results highlight the importance of a balanced aggregation strength between the donor and acceptor polymers to achieve high-performance all-PSCs with optimal active layer film morphology.

Published
2020
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19. White-Light Emission and Structural Distortion in New Corrugated Two-Dimensional Lead Bromide Perovskites

Author

Mao, Lingling, Wu, Yilei, Stoumpos, Constantinos C., Wasielewski, Michael R., and Kanatzidis, Mercouri G.

Abstract

Hybrid inorganic–organic perovskites are developing rapidly as high performance semiconductors. Recently, two-dimensional (2D) perovskites were found to have white-light, broadband emission in the visible range that was attributed mainly to the role of self-trapped excitons (STEs). Here, we describe three new 2D lead bromide perovskites incorporating a series of bifunctional ammonium dications as templates which also emit white light: (1) α-(DMEN)PbBr4(DMEN = 2-(dimethylamino)ethylamine), which adopts a unique corrugated layered structure in space group Pbcawith unit cell a= 18.901(4) Å, b= 11.782(2) Å, and c= 23.680(5) Å; (2) (DMAPA)PbBr4(DMAPA = 3-(dimethylamino)-1-propylamine), which crystallizes in P21/cwith a= 10.717(2) Å, b= 11.735(2) Å, c= 12.127(2) Å, and β = 111.53(3)°; and (3) (DMABA)PbBr4(DMABA = 4-dimethylaminobutylamine), which adopts Aba2 with a= 41.685(8) Å, b= 23.962(5) Å, and c= 12.000(2) Å. Photoluminescence (PL) studies show a correlation between the distortion of the “PbBr6” octahedron in the 2D layer and the broadening of PL emission, with the most distorted structure having the broadest emission (183 nm full width at half-maximum) and longest lifetime (τavg= 1.39 ns). The most distorted member α-(DMEN)PbBr4exhibits white-light emission with a color rendering index (CRI) of 73 which is similar to a fluorescent light source and correlated color temperature (CCT) of 7863 K, producing “cold” white light.

Published
2024
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20. Sliding-Ring Catenanes

Author

Fernando, Isurika R., primary, Frasconi, Marco, additional, Wu, Yilei, additional, Liu, Wei-Guang, additional, Wasielewski, Michael R., additional, Goddard, William A., additional, and Stoddart, J. Fraser, additional

Published
2016
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22. Chiral Redox-Active Isosceles Triangles

Author

Nalluri, Siva Krishna Mohan, primary, Liu, Zhichang, additional, Wu, Yilei, additional, Hermann, Keith R., additional, Samanta, Avik, additional, Kim, Dong Jun, additional, Krzyaniak, Matthew D., additional, Wasielewski, Michael R., additional, and Stoddart, J. Fraser, additional

Published
2016
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23. X-Shaped Oligomeric Pyromellitimide Polyradicals.

Author

Wu, Yilei, Han, Ji-Min, Hong, Michael, Krzyamd, Matthew D., Blackburn, Anthea K., Fernando, Isurika R., Cao, Dennis D., Wasielewski, Michael R., and Stoddart, J. Fraser

Subjects
*RADICALS (Chemistry), *OLIGOMERS, *ELECTRON spin states, *NUCLEAR magnetic resonance, *ELECTRON nuclear double resonance
Abstract

The synthesis of stable organic polyradicals is important for the development of magnetic materials. Herein we report the synthesis, isolation, and characterization of a series of X- shaped pyromellitimide (PI) oligomers (X„-R, n = 2-4, R = Hex or Ph) linked together by single C -- C bonds between their benzenoid cores. We hypothesize that these oligomers might form high-spin states in their reduced forms because of the nearly orthogonal conformations adopted by their PI units. 1H and 13C nuclear magnetic resonance (NMR) spectroscopies confirmed the isolation of the dimeric, trimeric, and tetrameric homologues. X-ray crystallography shows that X2-Ph crystallizes into a densely packed superstructure, despite the criss-crossed conformations adopted by the molecules. Electrochemical experiments, carried out on the oligomers Xn-Hex, reveal that the reductions of the PI units occur at multiple distinct potentials, highlighting the weak electronic coupling between the adjacent redox centers. Finally, the chemically generated radical anion and polyanion states, Xn- Hex·- and Xn-Hexn(·-respectively, were probed extensively by UV -- vis -- NIR absorption, EPR, and electron nuclear double resonance (ENDOR) spectroscopies. The ENDOR spectra of the radical monoanions Xn-Hex·- reveal that the unpaired electron is largely localized on a single PI unit. Further reductions of Xn-Hex·- yield EPR signals (in frozen solutions) that can be assigned to spin -- spin interactions in X-j-Hex2*·-^ Xj-Hex3*·-^ and X4-Hex4(·-^ Taken together, these findings demonstrate that directly linking the benzene rings of PIs with a single C-C bond is a viable method for generating stabilized high-spin organic anionic polyradicals. [ABSTRACT FROM AUTHOR]

Published
2018
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24. Energy and Electron Transfer Dynamics within a Series of Perylene Diimide/Cyclophane Systems

Author

Ryan, Seán T. J., primary, Young, Ryan M., additional, Henkelis, James J., additional, Hafezi, Nema, additional, Vermeulen, Nicolaas A., additional, Hennig, Andreas, additional, Dale, Edward J., additional, Wu, Yilei, additional, Krzyaniak, Matthew D., additional, Fox, Athan, additional, Nau, Werner M., additional, Wasielewski, Michael R., additional, Stoddart, J. Fraser, additional, and Scherman, Oren A., additional

Published
2015
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25. An Electrochromic Tristable Molecular Switch

Author

Sun, Junling, primary, Wu, Yilei, additional, Wang, Yuping, additional, Liu, Zhichang, additional, Cheng, Chuyang, additional, Hartlieb, Karel J., additional, Wasielewski, Michael R., additional, and Stoddart, J. Fraser, additional

Published
2015
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27. Redox Control of the Binding Modes of an Organic Receptor

Author

Frasconi, Marco, primary, Fernando, Isurika R., additional, Wu, Yilei, additional, Liu, Zhichang, additional, Liu, Wei-Guang, additional, Dyar, Scott M., additional, Barin, Gokhan, additional, Wasielewski, Michael R., additional, Goddard, William A., additional, and Stoddart, J. Fraser, additional

Published
2015
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28. Complexation of Polyoxometalates with Cyclodextrins

Author

Wu, Yilei, primary, Shi, Rufei, additional, Wu, Yi-Lin, additional, Holcroft, James M., additional, Liu, Zhichang, additional, Frasconi, Marco, additional, Wasielewski, Michael R., additional, Li, Hui, additional, and Stoddart, J. Fraser, additional

Published
2015
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31. Mechanical Bonds and Topological Effects in Radical Dimer Stabilization

Author

Frasconi, Marco, primary, Kikuchi, Takashi, additional, Cao, Dennis, additional, Wu, Yilei, additional, Liu, Wei-Guang, additional, Dyar, Scott M., additional, Barin, Gokhan, additional, Sarjeant, Amy A., additional, Stern, Charlotte L., additional, Carmieli, Raanan, additional, Wang, Cheng, additional, Wasielewski, Michael R., additional, Goddard, William A., additional, and Stoddart, J. Fraser, additional

Published
2014
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32. Photoexpulsion of Surface-Grafted Ruthenium Complexes and Subsequent Release of Cytotoxic Cargos to Cancer Cells from Mesoporous Silica Nanoparticles

Author

Frasconi, Marco, primary, Liu, Zhichang, additional, Lei, Juying, additional, Wu, Yilei, additional, Strekalova, Elena, additional, Malin, Dmitry, additional, Ambrogio, Michael W., additional, Chen, Xinqi, additional, Botros, Youssry Y., additional, Cryns, Vincent L., additional, Sauvage, Jean-Pierre, additional, and Stoddart, J. Fraser, additional

Published
2013
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33. Tunable White-Light Emission in Single-Cation-Templated Three-Layered 2D Perovskites (CH 3 CH 2 NH 3 ) 4 Pb 3 Br 10-x Cl x .

Author

Mao L, Wu Y, Stoumpos CC, Traore B, Katan C, Even J, Wasielewski MR, and Kanatzidis MG

Abstract

Two-dimensional (2D) hybrid halide perovskites come as a family (B) 2 (A) n-1 Pb n X 3n+1 (B and A= cations; X= halide). These perovskites are promising semiconductors for solar cells and optoelectronic applications. Among the fascinating properties of these materials is white-light emission, which has been mostly observed in single-layered 2D lead bromide or chloride systems (n = 1), where the broad emission comes from the transient photoexcited states generated by self-trapped excitons (STEs) from structural distortion. Here we report a multilayered 2D perovskite (n = 3) exhibiting a tunable white-light emission. Ethylammonium (EA + ) can stabilize the 2D perovskite structure in EA 4 Pb 3 Br 10-x Cl x (x = 0, 2, 4, 6, 8, 9.5, and 10) with EA + being both the A and B cations in this system. Because of the larger size of EA, these materials show a high distortion level in their inorganic structures, with EA 4 Pb 3 Cl 10 having a much larger distortion than that of EA 4 Pb 3 Br 10 , which results in broadband white-light emission of EA 4 Pb 3 Cl 10 in contrast to narrow blue emission of EA 4 Pb 3 Br 10 . The average lifetime of the series decreases gradually from the Cl end to the Br end, indicating that the larger distortion also prolongs the lifetime (more STE states). The band gap of EA 4 Pb 3 Br 10-x Cl x ranges from 3.45 eV (x = 10) to 2.75 eV (x = 0), following Vegard's law. First-principles density functional theory calculations (DFT) show that both EA 4 Pb 3 Cl 10 and EA 4 Pb 3 Br 10 are direct band gap semiconductors. The color rendering index (CRI) of the series improves from 66 (EA 4 Pb 3 Cl 10 ) to 83 (EA 4 Pb 3 Br 0.5 Cl 9.5 ), displaying high tunability and versatility of the title compounds.

Published
2017
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