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A well-controlled one-step method, assisted by sec-butyl alcohol solvent engineering and N,N-dimethylformamide solvent annealing under an N2 atmosphere, is developed for the growth of a high quality CH3NH3Pb(1−x)SnxI3 perovskite film.

Carrier recombination involved in polymeric photocatalysts includes undissociated exciton decay and charge recombination, which is the major hindrance limiting their photocatalytic activities. Realizing high-efficient charge generation and separation simultaneously in...

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A series of new fluorinated 9,9 0 -bianthracene derivatives (BAnFs) have been designed and synthesized to serve as deep-blue dopants in organic electroluminescent (EL) devices. With the different substitution patterns of the electron-withdrawing groups, such as F and CF 3 , the photophysical properties, the energy levels and thermal stability of these BAnFs are tuned, which are supported by a density functional study of their geometry and electronic structure. In the thin film state, the fluorescent emissions of the BAnFs are fine-tuned from 448 to 439 nm, with varied fluorinated phenyl rings attached to the 9,9 0 -bianthracene core. All the BAnFs show a considerable thermal stability, which have high T g values, above 150 C. A pure blue emission at the Commission Internationale de l' Éclairage (CIE) coordinates (0.156, 0.083), has been achieved using the host 4,4 0 -bis(N-carbazolyl)biphenyl (CBP) doped with 10,10 0 -bis(3,5-bis(trifluoromethyl)phenyl)-9,9 0 -bianthracene (BAn-(3,5)-CF 3 ). The maximum current efficiency and power efficiency of the BAn-(3,5)-CF 3 -doped device are 3.05 cd A À1 and 2.62 lm W À1 , corresponding to 5.02% of the maximum external quantum efficiency. The synthesized new fluorinated 9,9 0 -bianthracene derivatives show potential applications as highly efficient pure blue emitters for organic light emitting devices.

In the present study, we designed a novel, multi-stimuli responsive, biocompatible and non-immunogenic smart carrier for targeted delivery and triggered release of hydrophobic drugs. The designed multi-stimuli responsive smart chitosan-based microcapsules (MSRS-CS-MCs) have been fabricated successfully from folic acid (FA) functionalized thiolated chitosan via a facile sonochemical method. Targeting moiety FA and red fluorescent dye (Rhodamine B isothiocyanate, RITC) were immobilized onto the shells of microcapsules. Meanwhile, oleic acid (OA) modified FeO magnetic nanoparticles (OA-FeOMNPs) and a model hydrophobic drug, green fluorescent dye (Coumarin 6, C6), were encapsulated into the microcapsules. As drug carriers, the obtained spherical MSRS-CS-MCs with the average size of 500nm showed excellent magnetic responsive ability, favorable selectively folate-receptor-mediated targeting functionality to the HeLa cells, and attractive reduction-responsive release ability for hydrophobic drugs. The integration of magnetic and reduction dual-responsiveness, folate-receptor-mediated targeting functionality and fluorescence visualization into the versatile microcapsules make MSRS-CS-MCs promising nanocarriers for future biomedical applications.

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