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Punitharasu V, Mele Kavungathodi MF, Nithyanandhan J. Self-Assembly of Cis-Configured Squaraine Dyes at the TiO 2-Dye Interface: Far-Red Active Dyes for Dye-Sensitized Solar Cells. ACS APPLIED MATERIALS & INTERFACES 2018; 10:16541-16551. [PMID: 29676159 DOI: 10.1021/acsami.8b03106] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
To synergize both steric and electronic factors in designing the dyes for dye-sensitized solar cells, a series of cis-configured unsymmetrical squaraine dyes P11-P15 with suitably functionalized alkyl groups and squaric acid units containing the electron-withdrawing groups were synthesized, respectively. These dyes capture the importance of (i) the effect and position of branched alkyl groups, (ii) mono- and di-anchoring groups containing dyes, and (iii) further appending the alkyl groups through the cyanoester vinyl unit on the central squaric acid units of D-A-D-based cis-configured squaraine dyes. All the above factors govern the controlled self-assembly of the dyes on the TiO2 surface which helps to broaden the absorption profile of the dyes with an increased energy-harvesting process. With respect to the position of the branched alkyl groups, dye P11 with the sp3-C and N-alkyl groups away from the TiO2 surface showed a better device efficiency of 5.98% ( Jsc of 14.46 mA cm-2, Voc of 0.576 V, and ff of 71.8%) than its positional isomer P12 with 3.45% ( Jsc of 8.78 mA cm-2, Voc of 0.554 V, and ff of 70.9%). However, with respect to the dyes containing mono- and di-anchoring groups, P13 with two anchoring units exhibited a superior device performance of 7.58% ( Jsc of 17.12 mA cm-2, Voc of 0.618 V, and ff of 71.7%) in the presence of optically transparent co-adsorbent CDCA (3α,7α-dihydroxy-5β-cholanic acid) than dyes P11 and P12.
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Affiliation(s)
- Vellimalai Punitharasu
- Physical and Materials Chemistry Division , CSIR-National Chemical Laboratory, CSIR-Network of Institutes for Solar Energy , Dr. Homi Bhabha Road , Pune 411008 , India
- Academy of Scientific and Innovative Research (AcSIR) , New Delhi 110025 , India
| | - Munavvar Fairoos Mele Kavungathodi
- Physical and Materials Chemistry Division , CSIR-National Chemical Laboratory, CSIR-Network of Institutes for Solar Energy , Dr. Homi Bhabha Road , Pune 411008 , India
| | - Jayaraj Nithyanandhan
- Physical and Materials Chemistry Division , CSIR-National Chemical Laboratory, CSIR-Network of Institutes for Solar Energy , Dr. Homi Bhabha Road , Pune 411008 , India
- Academy of Scientific and Innovative Research (AcSIR) , New Delhi 110025 , India
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Synthesis, crystal structures, and optical properties of the π-π interacting pyrrolo[2,3-b]quinoxaline derivatives containing 2-thienyl substituent. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.06.008] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Alagumalai A, M K MF, Vellimalai P, Sil MC, Nithyanandhan J. Effect of Out-of-Plane Alkyl Group's Position in Dye-Sensitized Solar Cell Efficiency: A Structure-Property Relationship Utilizing Indoline-Based Unsymmetrical Squaraine Dyes. ACS APPLIED MATERIALS & INTERFACES 2016; 8:35353-35367. [PMID: 27957855 DOI: 10.1021/acsami.6b12730] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Squaraine dyes are promising chromophores to harvest visible and near-infrared (NIR) photons. A series of indoline-based unsymmetrical squaraine (SQ) dyes that contain alkyl chains at sp3 C- and N- atoms of indoline moieties with a carboxylic acid anchoring group were synthesized. The optical and electrochemical properties of the SQ dyes in solution were nearly identical as there was no change in the D-A-D SQ framework; however, remarkable changes with respect to the power conversion efficiencies (PCE) were observed depending upon the position of alkyl groups in the dye. Introduction of alkyl groups to the indoline unit that was away from anchoring unit were helped in more dye loading with controlled organization of dyes on surface, increased charge transfer resistance, long electron lifetime, and hence higher PCE than that of the corresponding isomer in which the alkyl groups funtionalized indoline unit contains the carboxylic acid anchoring group. Careful analysis of incident photon-to-current conversion efficiency (IPCE) profiles indicated the presence of aggregated structure on the TiO2 surface that contributes to the charge injection in the presence of a coadsorbent. A dye-sensitized solar cell (DSSC) device made out of SQ5 was achieved an efficiency of 9.0%, with an open-circuit potential (Voc) of 660 mV and short-circuit current density (Jsc) of 19.82 mA/cm2, under simulated AM 1.5G illumination (100 mW/cm2). The IPCE profile of SQ5 shows an onset near to 750 nm with a good quantum efficiency (>80%) in the range of 550-700 nm, indicating the importance of self-organization of dyes on the TiO2 surface for an efficient charge injection. This present investigation revealed the importance of position of alkyl groups in the squaraine-based dyes for the better PCE.
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Affiliation(s)
- Ananthan Alagumalai
- Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, CSIR-Network of Institutes for Solar Energy , Dr. Homi Bhaba Road, Pune 411008, India
| | - Munavvar Fairoos M K
- Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, CSIR-Network of Institutes for Solar Energy , Dr. Homi Bhaba Road, Pune 411008, India
| | - Punitharasu Vellimalai
- Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, CSIR-Network of Institutes for Solar Energy , Dr. Homi Bhaba Road, Pune 411008, India
- Academy of Scientific and Innovative Research (AcSIR) , New Delhi 110025, India
| | - Manik Chandra Sil
- Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, CSIR-Network of Institutes for Solar Energy , Dr. Homi Bhaba Road, Pune 411008, India
- Academy of Scientific and Innovative Research (AcSIR) , New Delhi 110025, India
| | - Jayaraj Nithyanandhan
- Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, CSIR-Network of Institutes for Solar Energy , Dr. Homi Bhaba Road, Pune 411008, India
- Academy of Scientific and Innovative Research (AcSIR) , New Delhi 110025, India
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Mei J, Leung NLC, Kwok RTK, Lam JWY, Tang BZ. Aggregation-Induced Emission: Together We Shine, United We Soar! Chem Rev 2015; 115:11718-940. [DOI: 10.1021/acs.chemrev.5b00263] [Citation(s) in RCA: 5139] [Impact Index Per Article: 571.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Ju Mei
- HKUST-Shenzhen Research Institute, Hi-Tech
Park, Nanshan, Shenzhen 518057, China
- Department of Chemistry,
HKUST Jockey Club Institute for Advanced Study, Institute of Molecular
Functional Materials, Division of Biomedical Engineering, State Key
Laboratory of Molecular Neuroscience, Division of Life Science, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Nelson L. C. Leung
- HKUST-Shenzhen Research Institute, Hi-Tech
Park, Nanshan, Shenzhen 518057, China
- Department of Chemistry,
HKUST Jockey Club Institute for Advanced Study, Institute of Molecular
Functional Materials, Division of Biomedical Engineering, State Key
Laboratory of Molecular Neuroscience, Division of Life Science, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Ryan T. K. Kwok
- HKUST-Shenzhen Research Institute, Hi-Tech
Park, Nanshan, Shenzhen 518057, China
- Department of Chemistry,
HKUST Jockey Club Institute for Advanced Study, Institute of Molecular
Functional Materials, Division of Biomedical Engineering, State Key
Laboratory of Molecular Neuroscience, Division of Life Science, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Jacky W. Y. Lam
- HKUST-Shenzhen Research Institute, Hi-Tech
Park, Nanshan, Shenzhen 518057, China
- Department of Chemistry,
HKUST Jockey Club Institute for Advanced Study, Institute of Molecular
Functional Materials, Division of Biomedical Engineering, State Key
Laboratory of Molecular Neuroscience, Division of Life Science, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Ben Zhong Tang
- HKUST-Shenzhen Research Institute, Hi-Tech
Park, Nanshan, Shenzhen 518057, China
- Department of Chemistry,
HKUST Jockey Club Institute for Advanced Study, Institute of Molecular
Functional Materials, Division of Biomedical Engineering, State Key
Laboratory of Molecular Neuroscience, Division of Life Science, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
- Guangdong
Innovative Research Team, SCUT-HKUST Joint Research Laboratory, State
Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China
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Kubota Y, Kasatani K, Takai H, Funabiki K, Matsui M. Strategy to enhance solid-state fluorescence and aggregation-induced emission enhancement effect in pyrimidine boron complexes. Dalton Trans 2015; 44:3326-41. [PMID: 25599172 DOI: 10.1039/c4dt03318c] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The synthesis and the solution/solid-state fluorescence properties of pyrimidine-based monoboron complexes differing in terms of the substituents [either two fluorine atoms (BF2 complex) or two phenyl groups (BPh2 complex)] on the boron atom are reported herein. Unrestricted C-Ar intramolecular rotation in the non-, trifluoromethyl-, and cyano-substituted derivatives resulted in negligible fluorescence in solution. On the other hand, methoxy- and dimethylamino-substituted analogues caused the restriction of the C-Ar intramolecular rotation and consequently resulted in relatively strong fluorescence in solution. The non-, trifluoromethyl-, and cyano-substituted derivatives showed a pronounced aggregation-induced emission enhancement effect. Dimethylamino-substituted derivatives exhibited solvatochromism in the fluorescence spectra. Substitution with BPh2 effectively enhanced the fluorescence quantum yield compared to the corresponding BF2 complexes in the solid-state.
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Affiliation(s)
- Yasuhiro Kubota
- Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan.
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Yu B, Chen Y, Hong M, Duan P, Gan S, Chao H, Zhao Z, Zhao J. Rhodium-catalyzed C–H activation of hydrazines leads to isoquinolones with tunable aggregation-induced emission properties. Chem Commun (Camb) 2015; 51:14365-8. [DOI: 10.1039/c5cc05239d] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
We report a RhIII-catalyzed synthesis of isoquinolonesviaC–H activation/annulation of benzoylhydrazines and alkynes for AIE studies.
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Affiliation(s)
- Bole Yu
- Shenzhen Key Lab of Nano-Micro Material Research
- School of Chemical Biology and Biotechnology
- Shenzhen Graduate School of Peking University
- Shenzhen
- China
| | - Ying Chen
- Shenzhen Key Lab of Nano-Micro Material Research
- School of Chemical Biology and Biotechnology
- Shenzhen Graduate School of Peking University
- Shenzhen
- China
| | - Mei Hong
- Shenzhen Key Lab of Nano-Micro Material Research
- School of Chemical Biology and Biotechnology
- Shenzhen Graduate School of Peking University
- Shenzhen
- China
| | - Pingping Duan
- Shenzhen Key Lab of Nano-Micro Material Research
- School of Chemical Biology and Biotechnology
- Shenzhen Graduate School of Peking University
- Shenzhen
- China
| | - Shifeng Gan
- Guangdong Innovative Research Team
- State Key Laboratory of Luminescent Materials and Devices
- South China University of Technology
- Guangzhou 510640
- China
| | - Hui Chao
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry
- School of Chemistry and Chemical Engineering
- Sun Yat-Sen University
- Guangzhou
- China
| | - Zujin Zhao
- Guangdong Innovative Research Team
- State Key Laboratory of Luminescent Materials and Devices
- South China University of Technology
- Guangzhou 510640
- China
| | - Jing Zhao
- Shenzhen Key Lab of Nano-Micro Material Research
- School of Chemical Biology and Biotechnology
- Shenzhen Graduate School of Peking University
- Shenzhen
- China
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Mei J, Hong Y, Lam JWY, Qin A, Tang Y, Tang BZ. Aggregation-induced emission: the whole is more brilliant than the parts. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2014; 26:5429-79. [PMID: 24975272 DOI: 10.1002/adma.201401356] [Citation(s) in RCA: 1833] [Impact Index Per Article: 183.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2014] [Revised: 05/25/2014] [Indexed: 05/20/2023]
Abstract
"United we stand, divided we fall."--Aesop. Aggregation-induced emission (AIE) refers to a photophysical phenomenon shown by a group of luminogenic materials that are non-emissive when they are dissolved in good solvents as molecules but become highly luminescent when they are clustered in poor solvents or solid state as aggregates. In this Review we summarize the recent progresses made in the area of AIE research. We conduct mechanistic analyses of the AIE processes, unify the restriction of intramolecular motions (RIM) as the main cause for the AIE effects, and derive RIM-based molecular engineering strategies for the design of new AIE luminogens (AIEgens). Typical examples of the newly developed AIEgens and their high-tech applications as optoelectronic materials, chemical sensors and biomedical probes are presented and discussed.
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Affiliation(s)
- Ju Mei
- Department of Chemistry, HKUST Jockey Club Institute for Advanced Study, Division of Life Science, Institute of Molecular Functional Materials and Division of Biomedical Engineering, The Hong Kong University of Science & Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong, China
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Guieu S, Rocha J, Silva AM. Crystallization-induced light-emission enhancement of diphenylmethane derivatives. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.07.107] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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