73025-93-1Relevant articles and documents
Effects of meta or para connected organic dyes for dye-sensitized solar cell
Jiao, Yunfei,Mao, Le,Liu, Shuaishuai,Tan, Tianwen,Wang, Donglin,Cao, Dapeng,Mi, Baoxiu,Gao, Zhiqiang,Huang, Wei
, p. 165 - 174 (2018)
Two novel phenothiazine-based organic dyes have been designed and synthesized as sensitizers for dye-sensitized solar cell (DSSC). In these dyes, we have employed carbazole as donor, phenothiazine as π-bridge, and rhodanine acetic acid as acceptor. For comparison, a benzene group has been introduced as the π-linker between carbazole donor and phenothiazine π-bridge with meta or para connection mode. Using the dye with the para-connected method, the DSSC devices exhibited higher power conversion efficiency of 5.57% than those based on dye with meta-connection mode (4.56%). The improved performance mainly came from better short-circuit photocurrent current. Photophysical, electrochemical, theoretical calculations and electrochemical impedance spectroscopy have been further investigated to disclose corresponding device mechanisms.
Syntheses, crystal structures, nonlinear optical properties and cis-trans isomerization of functionalized sulfur-terminal [Zn(II) and Cd?(II)] complexes based on phenothiazine-2,2′:6′,2″-terpyridine conjugated ligands
Sun, Wan,Sun, Pingping,Zhu, Yingzhong,Wang, Hui,Li, Shengli,Wu, Jieying,Tian, Yupeng
, p. 110 - 119 (2015)
One novel 2,2′:6′,2″-terpyridine ligand L and its complexes (Zn(S)2L, Cd(S)2L) were synthesized and systematically characterized. There were cis-trans isomerization of the ethylene group in compounds of L, Zn(S)2L and Cd(S
Panchromatic quasi-solid-state squaraine dye sensitized solar cells enhanced by F?rster resonance energy transfer of DCM-pyran
Yun, Hyeong Jin,Jung, Dae Young,Lee, Do Kyoung,Jen, Alex K.-Y.,Kim, Jae Hong
, p. 675 - 681 (2015)
The panchromatic operation of quasi-solid state dye sensitized solar cells is one of the most important criteria for enhancing the performance of solar cells. This paper presents a novel strategy for designing efficient panchromatic quasi-solid state dye sensitized solar cells that are enhanced by F?rster resonance energy transfer. 4-(Dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran is excited by the irradiation of visible light with a short wavelength, and the excited energy is then transferred to a blue organic photosentizer, symmetrically structured squaraine. The addition of 4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran to the quasi-solid electrolyte improves the photovoltaic performance of squaraine-sensitized solar cells. The optimized quasi-solid state dye sensitized solar cell exhibits approximately 1.8 times higher overall conversion efficiency than the solar cell without any fluorescence materials. In particular, the photocurrent is enhanced significantly at the absorption wavelength range of 4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran, which means that the panchromatic quasi-solid state dye sensitized solar cell has been designed successfully.
Molecular engineering of simple phenothiazine-based dyes to modulate dye aggregation, charge recombination, and dye regeneration in highly efficient dye-sensitized solar cells
Hua, Yong,Chang, Shuai,He, Jian,Zhang, Caishun,Zhao, Jianzhang,Chen, Tao,Wong, Wai-Yeung,Wong, Wai-Kwok,Zhu, Xunjin
, p. 6300 - 6308 (2014)
A series of simple phenothiazine-based dyes, namely, TP, EP, TTP, ETP, and EEP have been developed, in which the thiophene (T), ethylenedioxythiophene (E), their dimers, and mixtures are present to modulate dye aggregation, charge recombination, and dye regeneration for highly efficient dye-sensitized solar cell (DSSC) applications. Devices sensitized by the dyes TP and TTP display high power conversion efficiencies (PCEs) of 8.07 (Jsc=15.2mA cm -2, Voc=0.783V, fill factor (FF)=0.679) and 7.87 % (J sc=16.1mA cm-2, Voc=0.717V, FF=0.681), respectively; these were measured under simulated AM 1.5 sunlight in conjunction with the I-/I3- redox couple. By replacing the T group with the E unit, EP-based DSSCs had a slightly lower PCE of 7.98 % with a higher short-circuit photocurrent (Jsc) of 16.7mA cm-2. The dye ETP, with a mixture of E and T, had an even lower PCE of 5.62 %. Specifically, the cell based on the dye EEP, with a dimer of E, had inferior Jsc and Voc values and corresponded to the lowest PCE of 2.24 %. The results indicate that the photovoltaic performance can be finely modulated through structural engineering of the dyes. The selection of T analogues as donors can not only modulate light absorption and energy levels, but also have an impact on dye aggregation and interfacial charge recombination of electrons at the interface of titania, electrolytes, and/or oxidized dye molecules; this was demonstrated through DFT calculations, electrochemical impedance analysis, and transient photovoltage studies. Shape sensitivity: A solar cell sensitized with a phenothiazine-based dye containing a bithiophene unit (TTP) as the electron donor has a high power conversion efficiency (PCE) of 7.87 %, whereas a related dye containing an ethylenedioxythiophene and thiophene unit (ETP) and that containing an ethylenedioxythiophene dimer (EEP) have much lower PCE values. The photovoltaic performance is sensitive to structural modifications (see picture).
Using phenoxazine and phenothiazine as electron donors for second-order nonlinear optical chromophore: Enhanced electro-optic activity
Liu, Fenggang,Wang, Haoran,Yang, Yuhui,Xu, Huajun,Yang, Dan,Bo, Shuhui,Liu, Jialei,Zhen, Zhen,Liu, Xinhou,Qiu, Ling
, p. 196 - 203 (2015)
Two novel chromophores based on the phenoxazine (chromophore L1) or phenothiazine (chromophore L2) donor, and tricyanofuran acceptors linked together via thiophene as the bridges have been synthesized and systematically investigated. Cyclic voltammetry measurements showed that chromophore L1 had smaller energy gap than chromophore L2 due to the stronger electron-donating ability. Moreover, Density functional theory calculations suggested that the β value of chromophore L1 is 17% larger than that of chromophore L2. The doped film containing the chromophore L1 showed an r33 value of 49 pm/V at the concentration of 25 wt% which is two times higher than the EO activity of the chromophore L2 (23 pm/V) and the traditional aryl chromophore (10-20 pm/V). High r33 value, high thermal stability (onset decomposition temperatures higher than 220 °C) suggests the potential use of the new chromophore in nonlinear optical materials.
Phenothiazine–rhodamine-based colorimetric and fluorogenic ‘turn-on' sensor for Zn2+ and bioimaging studies in live cells
Karmegam, Muthu Vengaian,Karuppannan, Sekar,Christopher Leslee, Denzil Britto,Subramanian, Singaravadivel,Gandhi, Sivaraman
, p. 90 - 97 (2020)
A phenothiazine–rhodamine (PTRH) fluorescent dyad was synthesized and its ability to selectively sense Zn2+ ions in solution and in in vitro cell lines was tested using various techniques. When compared with other competing metal ions, the PTRH probe showed the high selectivity for Zn2+ ions that was supported by electronic and emission spectral analyses. The emission band at 528?nm for the PTRH probe indicated the ring closed form of PTRH, as for Zn2+ ion binding to PTRH, the λem get shift to 608?nm was accompanied by a pale yellow to pink colour (under visible light) and green to pinkish red fluorescence emission (under UV light) due to ring opening of the spirolactam moiety in the PTRH ligand. Spectral overlap of the donor emission band and the absorption band of the ring opened form of the acceptor moiety contributed towards the fluorescence resonance energy transfer ON mechanism for Zn2+ ion detection. The PTRH sensor had the lowest detection limit for Zn2+, found to be 2.89?×?10?8?M. The sensor also demonstrated good sensing application with minimum toxicity for in vitro analyses using HeLa cells.
Organic Nanoprobe Cocktails for Multilocal and Multicolor Fluorescence Imaging of Reactive Oxygen Species
Yin, Chao,Zhu, Houjuan,Xie, Chen,Zhang, Lei,Chen, Peng,Fan, Quli,Huang, Wei,Pu, Kanyi
, (2017)
Hypochlorite (ClO?) as a highly reactive oxygen species not only acts as a powerful “guarder” in innate host defense but also regulates inflammation-related pathological conditions. Despite the availability of fluorescence probes for detection
Enhancement of photovoltaic performance in dye-sensitized solar cells fabricated with dendritic photosensitizer containing site-isolated chromophores
Kim, Myeong Seok,Cho, Min Ju,Choi, Young Cheol,Ahn, Kwang-Soon,Choi, Dong Hoon,Kim, Kyungkon,Kim, Jae Hong
, p. 986 - 994 (2013)
We designed and synthesized a series of phenothiazine-based donor-acceptor type molecules which consist of different numbers of chromophores in a molecule for use as photosensitizers for dye-sensitized solar cells (DSSCs). Intriguingly, a dendritic molecule containing three chromophores not only gave a new possibility to modify the three dimensional structure, but also reduced aggregation between chromophores inducing dipole-dipole interaction. The DSSCs made of a dendritic photosensitizer system exhibited much higher cell efficiencies than those with the single- or double-chromophoric photosensitizers due to efficient electron extraction pathways in the dendritic molecule which lead to a significantly reduce recombination rate of electrons from the TiO 2 to the electrolyte when the same numbers of chromophores were loaded on the TiO2 surface. In particular, the DSSC based on the dendritic molecule exhibited improved open-circuit voltage than that of the single- or double-chromophoric photosensitizers. This can be attributed to strong adsorption properties of the TiO2 electrode and a screening effect to the electrolyte ions provided by the network structure of the dendritic photosensitizer. The different behavior of these DSSCs was explained by comparing the results of electrochemical impedance spectroscopy and measurement of open-circuit voltage decay.
The comparative study of new carboxylated 1,3-indanedione sensitizers with standard cyanoacetic acid dyes using co-adsorbents in dye-sensitized solar cells
Jeong, Hyeonjun,Chitumalla, Ramesh Kumar,Kim, Dong Woo,Vattikuti, S.V. Prabhakar,Thogiti, Suresh,Cheruku, Rajesh,Kim, Jae Hong,Jang, Joonkyung,Koyyada, Ganesh,Jung, Jae Hak
, p. 84 - 90 (2019)
Two new carboxylated 1,3-indanedione sensitizers (MPhe-ind and BPhe-ind) were synthesized and their dye-sensitized solar cells (DSSC) performance were compared with the corresponding standard cyanoacetic acid sensitizers (MPhe-cn and BPhe-cn). The carboxylated 1,3-indanedione sensitizers have shown almost 100 nm enhanced absorption curves compared to the cyanoacetic acid dyes with an extended IPCE curve up to 800 nm. Despite greater absorption and electrochemical properties, the synthesized dyes showed moderate efficiencies (2.10% and 2.67%) than standard dyes. The low electron injection efficiency and recombination of carboxylated 1,3-indanedione might be responsible for low efficiency. Detailed investigation studies have been performed and complemented with the theoretical studies.
New series of light-emitting polyquinolines containing 9,9′-spirobifluorene Units
Huang, Bing,Li, Jun,Jiang, Zuoquan,Qin, Jingui,Yu, Gui,Liu, Yunqi
, p. 6915 - 6922 (2005)
A new series of polyquinoline copolymers (P1-P5) containing 9,9'-spirobifluorene in the main chain were synthesized via Friedlaender reactions. The emission colors of the polymers were readily tuned from blue to yellow by changing the conjugated counits. Excellent EL performances were obtained for P5, probably because the proper donor/acceptor pairs were rightly matched, and the charge transport was significantly balanced. The devices based on P5 showed a maximum external quantum efficiency of 0.63% and a maximum photometric efficiency of 1.85 cd/A (at a brightness of 140 cd/m2). Yellow-green EL with narrow full width at the half-maximum (fwhm 2) among the currently reported polyquinolines was obtained for P5.
