AVS 58th Annual International Symposium and Exhibition
    Biofabrication and Novel Devices Focus Topic Tuesday Sessions
       Session BN-TuP

Paper BN-TuP1
Photoluminescence Characterization of Polythiophene Films Incorporated with Highly-Functional Molecules Such as Metallophthalocyanines

Tuesday, November 1, 2011, 6:00 pm, Room East Exhibit Hall

Session: Biofabrication and Novel Devices Poster Session
Presenter: Hiroaki Kobe, Kanto Gakuin University, Japan
Authors: H. Kobe, Kanto Gakuin University, Japan
K. Onaka, Kanto Gakuin University, Japan
H. Kato, Kanto Gakuin University, Japan
S. Takemura, Kanto Gakuin University, Japan
T. Hiramatsu, Kanto Gakuin University, Japan
K. Shimada, Kanto Gakuin University, Japan
K. Matsui, Kanto Gakuin University, Japan
Correspondent: Click to Email
Conducting polymer polythiophene (PT) films incorporated with highly-functional molecules such as phthalocyanines with different center metals were synthesized and characterized by x-ray photoelectron spectroscopy (XPS) measurements, photolumimescence measurements (PL) and time correlated single photon counting (TCSPC) measurements in order to obtain fundamental photoluminescence properties of various PT-phthalocyanine complexes prepared by different solvents. The electrochemical polymerization was performed in acetonitrile containing thiophene monomer and (ET)4NBF4 as a supporting electrolyte and the polymerization on an indium tin oxide (ITO) was conducted by applying positive voltage to the anode. The dopant molecules were iron phtalocyanine (FePc), copper phtalocyanine (CuPc) magnesium phtalocyanine (MgPc), lithium phtalocyanine (Li2Pc) and cobalt phtalocyanine (CoPc). Those molecules were doped in the polymer film by the diffusion method. The solvents used in the doping process were acetonitrile and toluene. At first, it was confirmed by XPS measurements that the metallophthalocyanines were introduced in the PT films. In the photoluminescence measurement, emission peaks were different in intensity and wavelength according to the additional dopant molecules. Those peaks were influenced by Soret and Q bands. The solvent used in the doping process also influenced the emission characteristics. In the case of CuPc using acetonitrile as a solvent, emission peaks which originated from Soret and Q bands were observed in the photoluminescence emission spectrum. On the other hand, emission peaks only due to Q band were observed in the cases of FePc, MgPc, Li2Pc and CoPc. Using toluene as a solvent drastically changed the emission characteristics. In the case of FePc, Li2Pc and CoPc, the emission peaks only due to Soret band were observed. As for CuPc, an emission peak due to Soret band was dominated. In the TCSPC measurements, it was confirmed that the number of life time components fitted to the decay curve ranged from 3 to 5 with several nanoseconds to several hundreds of nanoseconds. The life time and the number of components depended on the center metals of the doped phthalocyanine and the solvent used in the doping process. The present work clarified that the photoluminescence emission peak position, intensity and life time were varied by solvents and center metals of phthalocyanines.