183718-72-1Relevant articles and documents
Influence of the anchoring number in a carbazole-based photosensitizer on the photovoltaic performance of p-type NiO dye sensitized solar cells
Park, Ji Young,Jang, Bo Youn,Lee, Chi Hwan,Yun, Hyeong Jin,Kim, Jae Hong
, p. 61248 - 61255 (2014)
The development of high performance p-type dye sensitized solar cells (DSSCs) is essential for producing tandem configurations that can overcome the theoretical limitations of single-junction DSSCs. This study evaluates a suitable organic dye for producing high performance p-type DSSCs. The photovoltaic properties of the carbazole monomer (MCBZ) and dimer (DCBZ) were examined to determine the effects of the molecular structure of the photosensitizer on the photovoltaic performance. MCBZ absorbs a larger amount of visible light photons with wavelengths between 400 and 600 nm, and provides better p-type DSSCs than conventional coumarin 343-sensitized solar cells. Furthermore, DCBZ exhibits better photovoltaic performance under standard global AM 1.5 solar conditions than the MCBZ-sensitized solar cells because of the synergistic effects of the enhanced electron injection efficiency and reduced charge recombination probability.
Synthesis and DFT calculation on novel derivatives of Bis (indolyl) methanes
Zarandi, Maryam,Salimi Beni, Alireza
, p. 404 - 412 (2016)
Bis (indolyl) methane derivatives are an important class of biomolecules and heterocyclic scaffold of organic compounds. To extension novel Bis (indolyl) methane derivatives, two new aldehydes have been applied. In order to structural investigation, the optimized geometry, total energy, potential energy surface and vibrational wavenumbers of Bis (indolyl) methanes have been determined using DFT/B3LYP method with 6-31G (d) basis set. A complete vibrational assignment is provided for the observed IR spectra of Bis (indolyl) methanes. These methods are proposed as a tool to be applied in the structural characterization of Bis (indolyl) methanes. The isotropic chemical shift computed by 1H and 13C NMR chemical shifts of the Bis (indolyl) methanes, calculated using the GIAO method, shows good agreement with experimental observations. The calculated HOMO and LUMO with frontier orbital gap are presented in order to predict antibacterial properties.
Synthesis, photophysical and electrochemical properties of two novel carbazole-based dye molecules
Zhang, Qing,Zhu, Weiju,Fang, Min,Yin, Fangfang,Li, Cun
, p. 379 - 385 (2015)
Two carbazole-based dye molecules: 3-(6-benzothiazol-2-yl-9H- hexylcarbazole-3-yl)-2-cyano-acylic acid (D3) and 3-[5-(6-benzothiazol-2-yl-9H- hexylcarbazole-3-yl)-thiophen-2-yl]-2-cyan-acylic acid (D4) were synthesized by an approach from carbazole derivate using Vilsmeier-Haack, Suzuki cross-coupling and Knoevenagel reactions. Their physical and electrochemical properties were investigated. D3 and D4 exhibit different optical properties, such as UV absorption, photoluminescence, fluorescence quantum yield and fluorescence lifetime in different solvents. Compared with D3 without a thiophene unit, the maximum absorption wavelength of D4 red-shift obviously and its fluorescence intensity is also enhanced. A shift of the EHOMO and ELUMO is observed for D3 (EHOMO = 2.06 V, ELUMO = -1.39 V vs. NHE) and D4 (EHOMO = 1.73 V, ELUMO = -1.33 V vs. NHE). D3 and D4 can be used as dyes for dye-sensitized solar cells (DSSCs) with TiO 2 nanomaterial because their EHOMO are lower than the conduction band edge of TiO2 [-0.5 V (vs. NHE)] and their E LUMO are higher than the I3-/I- redox potential [0.42 V (vs. NHE)].
Aggregation induced emission-active two-photon absorption zwitterionic chromophore for bioimaging application
Meng, Fei,Zhang, Chengkai,Li, Dandan,Tian, Yupeng
, (2020)
The fabrication of two-photon absorption material is a versatile approach to achieve high resolution bioimaging with low phototoxicity yet remain sophisticated. Herein, a zwitterionic chromophore, MF, with D-π-A configuration has been rational designed and synthesized. Remarkably, MF exhibited enhanced one- and two-photon fluorescent in the aggregation states. Additionally, the obtained MF NPs encapsulated by Pluronic F-127, could be employed as a two-photon fluorescent probe for bioimaging. The results reveal that MF NPs could target mitochondria by using two-photon confocal microscopy and stimulated emission depletion nanoscopy methods.
Deep-blue electroluminescence from nondoped and doped organic light-emitting diodes (OLEDs) based on a new monoaza[6]helicene
Hua, Wanming,Liu, Zhi,Duan, Lian,Dong, Guifang,Qiu, Yong,Zhang, Baojie,Cui, Deliang,Tao, Xutang,Cheng, Na,Liu, Yongjun
, p. 75 - 84 (2015)
A new organic electroluminescent material, monoaza[6]helicene (1), was successfully prepared via an effective photochemical reaction in about 10 minutes with high productivity. The thermal, photophysical, electrochemical properties, quantum chemical and X-ray structural studies as well as characteristics of organic light-emitting diodes were fully investigated. 1 exhibited excellent solubility and high thermal stability. The first singlet excitation energy of 1 was measured to be around 2.92 eV with a HOMO level of -5.19 eV and a LUMO level of -2.27 eV. Helical molecular geometry of 1 effectively blocked the π-conjugation and decreased the close-packing of molecules. Both the nondoped and doped OLEDs emitted deep-blue light at 444 and 462 nm with CIE coordinates of (0.15, 0.09) and (0.15, 0.10). The doped OLED based on 1 was the first example of helicenes as light emitters that exhibited a brightness of more than 3000 cd m-2 with high color purity and excellent efficiency stability.
Synthesis of carbazole-based copolymers containing carbazole-thiazolo[5,4-: D] thiazole groups with different dopants and their fluorescence and electrical conductivity applications
Sathiyan, Govindasamy,Thangamuthu, Rangasamy,Sakthivel, Pachagounder
, p. 69196 - 69205 (2016)
To improve the electrical conductivity of poly(carbazole-thiazolo[5,4-d]thiazole) (p-CzTT), five different dopants, such as HCl, Fe(iii), Cu(ii), H3BO3, and I2, were introduced into its framework through protonation of a nitrogen atom or by complex formation. Carbazole-thiazolo[5,4-d]thiazole (CzTT) and poly(carbazole-thiazolo[5,4-d]thiazole) (p-CzTT) were synthesized by the reactions of carbazole aldehydes and dithiooxamide. The synthesized monomer and polymer were confirmed by FT-IR, UV-vis, 1H, 13C-NMR, and GPC studies. The doped polymers were examined by FT-IR spectroscopy, UV-visible absorption, fluorescence, thermogravimetric analysis (TGA), cyclic voltammetry (CV), and electrical conductivity. The optical band gap (Eoptg) of CzTT and p-CzTT were found to be 2.74 eV and 1.95 eV, respectively. The thermal stability of the polymer showed 5% weight loss at 358 °C. Based on CV analysis, the HOMO and LUMO energy levels and the electrochemical band gap (Ecvg) of p-CzTT were obtained as -5.86 eV, -3.19 eV, and 2.67 eV, respectively. The CzTT and p-CzTT exhibited fluorescence emission at 461 nm and 448 nm, respectively. Among the dopants introduced, Fe(iii)- and I2-doped polymer showed excellent electrical conductivities of 6.8 × 10-5 S cm-1 and 5.9 × 10-5 S cm-1, respectively.
Regulation of aggregation-induced emission color of α-cyanostilbene luminogens through donor engineering of amino derivatives
Tonga, Murat
supporting information, (2021/03/16)
In this contribution, α-cyanostilbene-based D-π-A-π-D type compounds consisting of different substituents on the amino donor group (e.g., fused, aryl/alkyl, and dialkyl) were designed, synthesized and their aggregation-induced emission was investigated thoroughly. The incorporation of these substituents furnished AIE features with tunable emission colors ranging from green-to-yellow-to-red. The compounds all showed a weak emission in THF; however, they showed an enhanced emission upon addition of water by forming emissive aggregates, which may arise from the restriction of twisted intramolecular charge transfer and E/Z isomerization. The DFT calculations revealed that the luminogens adopted distinctive conformations including a highly twisted one and a relatively coplanar one with the variation in the amino substituents.
Photosensitive dye taking carbazole and triphenylamine as D-D-π-A structure of two-stage electron donor as well as preparation method and application thereof (by machine translation)
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Page/Page column 13-16; 18-20; 24, (2020/09/01)
The invention belongs to the field of solar cells and discloses a photosensitive dye taking carbazole and triphenylamine as a two-stage electron donor and D-D-π-A structure as well as a preparation method and application of the photosensitive dye as a π conjugated bridge. The preparation method is simple, the process is easy to control, the raw material source is wide, the price is low, the prepared photosensitive dye is high in purity, high in yield and suitable for industrial production. The photosensitive dye is used for preparing a photo-sensitized solar cell. (by machine translation)
