田島 裕之

20-μm-diameter WGM resonators that include a terfluorene emission layer and a 10-nm-thick layer of Al or Ag were investigated. The plasmon-quenching effect on amplified spontaneous emission was effectively suppressed by the resonator structure.

We developed a device parameter to evaluate the magnitude of the energy transfer in organic WGM resonators. ASE easily occurs under the condition that the energy acceptor molecules become unable to accept energy from the energy donor excitons.

We report the synthesis of P-BT and TP-BT and their OTFT properties based on electronic dimensionality and access resistance (R_acc). TP-BT can suppress R_acc due to its 3D electronic structure.

Herein, we report the fabrication of an organic spintronic device by a one-pot process called nanoscale electrocrystallization, that allows for the site-selective growth of organic nanocrystals on a substrate between two electrodes. Axially substituted iron phthalocyanine was used to constitute the nanocrystals that exhibited a strong correlation between the localized spin and conduction electrons. In addition, the nanocrystals exhibited a negative giant magnetoresistance ([R(B) - R(0)]/R(0)) of around -56%. Moreover, the spintronic device exhibited an angular dependence of its negative giant magnetoresistance, which confirmed the highly oriented growth of the nanocrystals by the nanoscale electrocrystallization method. In summary, our method enables the easy fabrication of organic spintronic devices based on such spin interactions. ? 2013 The Royal Society of Chemistry.

We have measured the magnetic torque of TPP[Fe(Pc)Br<inf>2</inf>]<inf>2</inf>and TPP[Fe(Pc)Cl<inf>2</inf>]<inf>2</inf>to clarify their magnetic state, comparing our results with those of formerly performed experiments on TPP[Fe(Pc)CN<inf>2</inf>]<inf>2</inf>. The conductors in this family exhibit giant negative magnetoresistance. We employed the cantilever magnetometry technique with our newly developed calibration method to obtain absolute values of the torque (J/rad Fe mol), enabling the comparison between experimental and calculated results. With decreasing temperature, the antiferromagnetic ordering of the \pi electron is found to occur at {\sim}13 K, and then the antiferromagnetic short-range ordering of the d electron follows at {\sim}8 K in these two salts. Our anisotropic one-dimensional Heisenberg model can explain 1) the susceptibility data quantitatively, 2) the torque curves quantitatively, which were obtained when the magnetic field was rotated in the ac-plane, and 3) the behavior of the d electron in the torque curves qualitatively, which were obtained by rotating the field in the ab-plane. By combining our model with the antiferromagnetic model for the \pi electron, the experimental torque data on TPP[Fe(Pc)Br<inf>2</inf>]<inf>2</inf>and TPP[Fe(Pc)Cl<inf>2</inf>]<inf>2</inf>are satisfactorily described. In addition, we could also successfully obtain the anisotropy energy in the antiferromagnetic state.