Hua Lu

Hangzhou Normal University, Hang-hsien, Zhejiang Sheng, China

Are you Hua Lu?

Claim your profile

Publications (2)8.41 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: Two new solution-processable enlarged pi -conjugated donor-acceptor (D-A) organic small molecules consisting of dialkoxysubstituted benzo[1,2-b:4,5-b'] dithiophene (BDT) or dioctyltertthiophene (3T) as the central donor units, diketopyrrolopyrrole (DPP) as the acceptor unit and triphenylamine (TPA) as the terminal conjugated segment, TPA-DPP-BDT and TPA-DPP-3T, were designed and synthesized. Both small molecules possess broad absorption ranging from 300 to 800 nm with an optical band at approximately 1.50 eV and relatively low HOMO energy levels from -5.12 to approximately -5.16 eV. Expectedly, the UV-Vis absorption onset (810 nm) of TPA-DPP-BDT is largely red-shifted (60 nm) relative to that (750 nm) of previously reported BDT(TDPP) 2, which consists of BDT and DPP units. Unlike most of the TPA based molecules, strong molecular aggregation was observed in the solid state for both small molecules. In addition, atomic force microscopy (AFM) and X-ray diffraction (XRD) investigations indicated that TPA-DPP-3T and TPA-DPP-BDT exhibit good miscibility with fullerene derivatives. The organic solar cells based on TPA-DPP-BDT/PC61BM(1:1) demonstrated power conversion efficiencies as high as 4.04% with a short-circuit current density (J(sc)) of 11.40 mA cm (2) and a fill factor (FF) of 53.2% when the active layer of the cell was annealed at 130 degrees C for 10 min.
    No preview · Article · Oct 2014 · Organic Electronics
  • [Show abstract] [Hide abstract]
    ABSTRACT: A series of linear 2,5-tetraphenylsilole-vinylene-type polymers were successfully synthesized for the first time. The tetraphenylsilole moieties were linked at their 2,5-positions through a vinylene bridge with p-dialkoxybenzenes to obtain polymer PSVB and with 3,6-carbazole to obtain polymer PSVC. For comparison, 2,5-tetraphenylsilole-ethyne-type polymer PSEB was also synthesized, in which the vinylene bridge of PSVB was replaced with an ethyne bridge. Very interestingly, the bridging group (vinylene or ethyne) had a significant effect on the photophysical properties of the corresponding polymers. The fluorescence peak of PSEB at 504 nm in solution originated from the emission of its silole moieties, whereas PSVB and PSVC emitted yellow light and no blueish-green emission from the silole moieties was observed, thus demonstrating that the emissions of PSVB and PSVC were due to their polymer backbones. More importantly, the 2,5-tetraphenylsilole-ethyne polymer exhibited a pronounced aggregation-enhanced emission (AEE) effect but the 2,5-tetraphenylsilole-vinylene polymer was AEE-inactive. Moreover, both AEE-active 2,5-tetraphenylsilole-ethyne polymer and AEE-inactive 2,5-tetraphenylsilole-vinylene polymers were successfully applied as fluorescent chemosensors for the detection of explosive compounds.
    No preview · Article · Jul 2012 · Chemistry - An Asian Journal