3:00 PM - 3:30 PM
[12p-N324-4] Creation of Photofunctional Materials due to Exciton Fusion and Fission using Effects of Magnetic Field and Plasmon
Keywords:Magnetic Field Effect, Exciton Fusion, Exciton Fission
We examined effects of magnetic field and plasmon on photoproperties of photofunctional materials due to excition fusion and fission as described below.
First, effects of silver nanoplate (AgPL) or gold nanoparticle (AuNP) and magnetic field on photon upconversion based on sensitized triplet-triplet annihilation (PUC-TTA) as triplet exciton fusion were examined in the system of platinum(II) octaethylporphyrin (PtOEP) and 9,10-diphenylanthracene (DPA), when AgPL or AuNP was incorporated into polymer thin films containing PtOEP and DPA. In the presence of AgPL or AuNPs, the PUC emission intensity increased as compared with that in the absence of AgPL or AuNPs. The result is most likely attributable to the localized surface plasmon resonance (LSPR) of AgPL or AuNP. On the other hand, in the absence of AgPL, the PUC emission intensity decreased in the presence of magnetic field, while in the presence of AgPL, the PUC emission intensity increased in the presence of magnetic field. The synergetic effect of AgPL and magnetic field on the PUC emission intensity in PUC-TTA was observed for the first time.
Second, the effect of AgPL on the singlet exciton fission of rubrene (Rub) was verified by examining the magnetic field effects on the singlet exciton fission (SF) of Rub through measuring magnetic field dependence of fluorescence intensity of Rub in two films in the absence and the presence of AgPL. The fluorescence intensity of Rub in Rub-AgPL composite film was larger than that in Rub film. The enhancement must be caused by large electric fields due to LSPR of AgPL. The magnitude of the MFEs in the Rub-AgPL composite film was almost same as those in the Rub film. These results strongly indicate that the triplet excited states of Rub due to SF in the presence of AgPL are generated much more as compared with those in the absence of AgPL in the Rub films.
First, effects of silver nanoplate (AgPL) or gold nanoparticle (AuNP) and magnetic field on photon upconversion based on sensitized triplet-triplet annihilation (PUC-TTA) as triplet exciton fusion were examined in the system of platinum(II) octaethylporphyrin (PtOEP) and 9,10-diphenylanthracene (DPA), when AgPL or AuNP was incorporated into polymer thin films containing PtOEP and DPA. In the presence of AgPL or AuNPs, the PUC emission intensity increased as compared with that in the absence of AgPL or AuNPs. The result is most likely attributable to the localized surface plasmon resonance (LSPR) of AgPL or AuNP. On the other hand, in the absence of AgPL, the PUC emission intensity decreased in the presence of magnetic field, while in the presence of AgPL, the PUC emission intensity increased in the presence of magnetic field. The synergetic effect of AgPL and magnetic field on the PUC emission intensity in PUC-TTA was observed for the first time.
Second, the effect of AgPL on the singlet exciton fission of rubrene (Rub) was verified by examining the magnetic field effects on the singlet exciton fission (SF) of Rub through measuring magnetic field dependence of fluorescence intensity of Rub in two films in the absence and the presence of AgPL. The fluorescence intensity of Rub in Rub-AgPL composite film was larger than that in Rub film. The enhancement must be caused by large electric fields due to LSPR of AgPL. The magnitude of the MFEs in the Rub-AgPL composite film was almost same as those in the Rub film. These results strongly indicate that the triplet excited states of Rub due to SF in the presence of AgPL are generated much more as compared with those in the absence of AgPL in the Rub films.