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Yan M.-K.,Key Laboratory for Organic Electronics and Information Displays KLOEID | Tao Y.,Key Laboratory for Organic Electronics and Information Displays KLOEID | Chen R.-F.,Key Laboratory for Organic Electronics and Information Displays KLOEID | Zheng C.,Key Laboratory for Organic Electronics and Information Displays KLOEID | And 2 more authors.
RSC Advances | Year: 2012

Two typical hole transport groups, carbazole and diphenylamine, and two typical electron transport groups, diphenylphosphine oxide and triphenylsilane, were linked to biphenyl at its ortho/meta/para-positions to investigate the effects of building blocks and linking topologies on the structural and electronic properties of such constructed host materials via density function theory calculation. It is found that the frontier orbital levels, energy band gap, and triplet energy of host molecules can be effectively tuned by different building blocks and linking topologies. The electron-transporting nature of π-conjugated molecules can be enhanced by connecting electron-withdrawing building blocks at the ortho or meta position, but not at the para-position. Employing asymmetric building blocks with meta-type topology would be an effective strategy for the design of high-performance bipolar host materials. This journal is © 2012 The Royal Society of Chemistry. Source


Li H.-H.,Nanjing University of Posts and Telecommunications | Chen R.-F.,Nanjing University of Posts and Telecommunications | Chen R.-F.,Key Laboratory for Organic Electronics and Information Displays KLOEID | Ma C.,Nanjing University of Posts and Telecommunications | And 4 more authors.
Wuli Huaxue Xuebao/ Acta Physico - Chimica Sinica | Year: 2011

We review the history, fabrication procedures, and mechanisms of TiO2 nanotubes prepared by the anodic oxidation of titanium. The influence of various preparation factors, such as electrolytes, pH value, voltage, bath temperature, and post treatment, on the structure and morphology of the TiO2 nanotubes are discussed. This review also summarizes the application of TiO2 nanotubes to dye-sensitized solar cells, quantum dot solar cells, and bulk heterojunction solar cells. A perspective on the future development of TiO2nanotubes and their applications is tentatively discussed. © Editorial office of Acta Physico-Chimica Sinica. Source


Cai X.,Nanjing University of Posts and Telecommunications | Shi L.,Nanjing University of Posts and Telecommunications | Liu X.,Nanjing University of Posts and Telecommunications | Liu X.,Key Laboratory for Organic Electronics and Information Displays KLOEID | And 8 more authors.
Progress in Chemistry | Year: 2013

Conjugated polymers with large, delocalized molecular structure have been widely used in the field of organic electronics, biological and/or chemical sensing, diagnosis and bioimaging due to their unique optical absorption and emission characteristics. Conjugated polymers functionalized by special groups, such as glycosyl, biotin, carboxyl, amino acid, peptide, nucleic acid, antibody, amino, thiol and so on, have ability to recognize certain biomolecules or heavy metal ions. Here, we review the recent development of functionalized conjugated polymer and their application in the biological and/or chemical analysis on the basis of functional groups of different types. Methods for functionalization of conjugated polymers, the application in the detection of proteins, pathogens, Hg2+ and Pb2+, and future development of this area are also included. Source


Yin J.,Key Laboratory for Organic Electronics and Information Displays KLOEID | Zhang S.-L.,Key Laboratory for Organic Electronics and Information Displays KLOEID | Chen R.-F.,Key Laboratory for Organic Electronics and Information Displays KLOEID | Ling Q.-D.,Nanjing University of Posts and Telecommunications | Huang W.,Nanjing University of Posts and Telecommunications
Physical Chemistry Chemical Physics | Year: 2010

By mimicking the molecular structure of 4,4′-bis(N-carbazolyl)-2, 2′-biphenyl (CBP), which is a widely used host material, a new series of host molecules (carbazole-endcapped heterofluorenes, CzHFs) were designed by linking the hole-transporting carbazole to the core heterofluorene molecules in either meta or para positions of the heterofluorene. The aromatic cores considered in this study are biphenyl, fluorene, silafluorenes, germafluorenes, carbazole, phosphafluorene, oxygafluorene, and sulfurafluorene. To reveal their molecular structures, optoelectronic properties and structure-property relationships of the proposed host materials, an in-depth theoretical investigation was elaborated via quantum chemical calculations. The electronic structures in the ground states, cationic and anionic states, and lowest triplet states of these designed molecules have been studied with emphasis on the highest occupied molecular orbitals (HOMOs), the lowest unoccupied molecular orbitals (LUMOs), energy gaps (Eg), triplet energy gaps ( 3Eg), as well as some other electronic properties including ionization potentials (IPs), electron affinities (EAs), reorganization energies (λ), triplet exciton generation fraction (χT), spin density distributions (SD), and absorption spectra. These photoelectronic properties can be tuned by chemical modifications of the heteroatom and the carbazole substitution at different positions. This study provides theoretical insights into the nature of host molecules, and shows that the designed CzHFs can meet the requirements of the host materials for triplet emitters. © 2010 the Owner Societies. Source


Likun M.,Nanjing University of Posts and Telecommunications | Xingfen L.,Key Laboratory for Organic Electronics and Information Displays KLOEID | Xingfen L.,Nanjing University of Posts and Telecommunications | Quli F.,Key Laboratory for Organic Electronics and Information Displays KLOEID | And 3 more authors.
Progress in Chemistry | Year: 2010

conjugated fluorescent polymers (CPs) such as polyacetylene, polyfluorene, polythiophene and polyphenylene derivatives have unique optical properties, self-assembly performance and regulable structure and properties. They have been used asexcellent optical sensing materials to develop high sensitive and selective sensors by utilizing the large extinction coefficient and high flurescence quantum yield of conjugated polymers, which have been a research hot spot in the field of biosensors. Detection of metal ions based on the conjugated polymer primarily relies on the non- water-soluble conjugated polymers. Metal ions can be detected by investigating the changes of the optical characteristics of the polymers induced by the combination of metal ions with some units such as bipyridyl and crown ethers on the polymer chains. Water solubility ofconjugated polymers can be improved by appending hydrophilic side chains on the main chain of polymer, which provide many new ideas for the design of metal ions biosensors. For example, some biomolecules such as DNA and glucopyranose can be used to design schemes in order to improve the sensitivity and selectivity for the detection of metal ions. This review summarizes the recent progress of highly sensitive detection of heavy metal ions (Hg 2+,Pb2+), transition-metal ions (Cu2+, Ni 2+, Fe3+, Ru3+, Ag+), rare earth element ion (Eu3+), and alkali metal ions (K+, Na +, Li+) based on non-water-soluble and water-soluble conjugated fluorescent polymers. The development prospects of the field is presented. Source

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