AVS 60th International Symposium and Exhibition
    Thin Film Thursday Sessions
       Session TF-ThP

Paper TF-ThP28
Photoluminescence Characterization of Polythiophene Doped with Metallophthalocyanines whose Central Metals Contain 3d, 4d and 5d Electrons

Thursday, October 31, 2013, 6:00 pm, Room Hall B

Session: Thin Films Poster Session
Presenter: H. Kobe, Kanto Gakuin University, Japan
Authors: H. Kobe, Kanto Gakuin University, Japan
R. Sakamoto, Kanto Gakuin University, Japan
H. Kato, Kanto Gakuin University, Japan
S. Takemura, Kanto Gakuin University, Japan
k. Shimada, Kanto Gakuin University, Japan
T. Hiramatsu, Kanto Gakuin University, Japan
K. Matsui, Kanto Gakuin University, Japan
Correspondent: Click to Email
Conducting polymer polythiophene (PT) films doped with zinc phthalocyanine (ZnPc), tin phthalocyanine (SnPc) and lead phthalocyanine (PbPc) were synthesized and characterized by photolumimescence measurements (PL) and time-correlated single photon counting (TCSPC) measurements in order to obtain fundamental PL properties of various PT-phthalocyanine complexes prepared by different solvents. PT films were electrochemically synthesized on an indium tin oxide (ITO) substrate with a resistivity of 30 Ω / cm2 in an electrochemical cell utilizing the voltage controlled method. Electrochemical polymerization was performed in acetonitrile containing 0.05 M thiophene monomer and 0.1 M of the supporting electrolyte (Et)4NBF4 in a N2 atmosphere. The ITO substrate was used as a working electrode (anode) for polymerization. A platinum mesh and Ag/AgCl electrode were used as a counter and reference electrodes, respectively. Typically, 3.5 V versus the reference electrode was applied to the anode for 300 sec for the PT film synthesis. BF4- anions were doped in the as-grown films. Injection of PcMs into the PT films was performed by a diffusion method. PcMs molecules were diffused into the PT films by dipping as-grown PT films in phthalocyanine dissolved acetonitrile or toluene. Phthalocyanine was dissolved until it was saturated. The wavelength of PL emission peaks and lifetimes drastically changed with the used solvent in the doping process and the central metals. In the PL measurement, in the case of ZnPc doped films, emission peaks were observed in both Soret and Q band regions using both solvents in the doping process. In the case of SnPc doped films, using acetonitrile in the process, the observed PL emission peaks were originated from Soret and Q bands whereas the PL emission peaks were assigned to only Q band-origin in the case of toluene used as a solvent. In the case of PbPc doped films, emission peaks were observed in only Soret band region using both acetonitrile and toluene. In the TCSPC measurements, the lifetime values ranged from several ten nsec to several hundred nsec. Calculated averaged lifetime value of each compound showed almost the same value among these three compounds. Typically, the averaged lifetime was around 190 nsec. However, ZnPc-doped PT acetonitrile-processed sample and SnPc-doped PT toluene-processed sample yielded a different lifetime profile which gave a short lifetime value. The lifetime depended not only on the central metals of the doped phthalocyanine but also on the solvent used in the doping process. This work was aided by MEXT-supported Program for the Strategic Research Foundation at Private Universities.