Effect of gold nanoparticle on photon upconversion based on sensitized triplet–triplet annihilation in polymer films

Self Cite

The effect of silver nanoplate (AgPL) on the singlet exciton fission (SF) of rubrene (Rub) was verified by examining the magnetic field effects (MFEs) on the SF of Rub through measuring magnetic field dependence of fluorescence intensity of Rub in two thick Rub polymer-composite films in the absence and the presence of AgPL. The fluorescence intensity of Rub in the Rub-AgPL polymer-composite film was larger than that in the Rub polymer-composite film. The enhancement (1.4 times) must be caused by strong electric fields due to localized surface plasmon resonance (LSPR) of the embedded AgPL near the Rub in polymer matrix. The magnitude of the MFEs in the Rub-AgPL polymer-composite film was almost same as those in the Rub polymer-composite film. These results strongly indicate that the efficiency of SF was enhanced by the LSPR due to the embedded AgPL into the polymer matrix in the Rub-AgPL polymer-composite film.

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Effect of silver nanoplate on singlet exciton fission in rubrene polymer-composite films

Yonemura

Aira

Asakura

et al. 2019

Self Cite

“…Also, we reported the effect of AuNP on the efficiency of PUC-TTA in the polymer thin films of the PtOEP-DPA system as the solid media. 35) The enhancements of the upconversion fluorescence from DPA and the phosphorescence of PtOEP due to LSPR of AuNP were observed in the polymer thin films of the PtOEP-DPA system incorporated with AuNP. As the results, the enhancements of PUC-TTA are most likely attributable to large electric fields due to LSPR of AuNP.…”

Section: Introductionmentioning

confidence: 94%

Synergetic effect of silver nanoplate and magnetic field on photon upconversion based on sensitized triplet–triplet annihilation in polymer system

Noda

Shibata

Fukuda

et al. 2019

Self Cite

Effects of silver nanoplate (AgPL) and magnetic field on photon upconversion based on sensitized triplet–triplet annihilation (PUC-TTA) were examined in the system of platinum(II) octaethylporphyrin (PtOEP) and 9,10-diphenylanthracene (DPA), when AgPLs were incorporated into polymer thin films containing PtOEP and DPA. In the presence of AgPL, the PUC emission intensity increased as compared with that in the absence of AgPL. The result is most likely attributable to the localized surface plasmon resonance of AgPL. 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 drastically 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.

“…[21][22][23][24][25][26] Previously, we found that the efficiency of PUC-TTA using platinum(II) octaethyl-porphyrin as a triplet photosensitizer and 9,10-diphenylanthracene as a fluorescent emitter was increased when using AgNP, AuNP, or triangular silver nanoplate (AgPL) as compared to not using them in solidliquid and solid systems. [27][28][29] Singlet exciton fission (SF) is a process in which a singlet molecular excited state splits into two triplet excited states. [30][31][32][33][34] Hence, the SF is expected to surmount the Shockley-Queisser efficiency limit for a solar cell containing a single optimized semiconductor junction.…”

Section: Introductionmentioning

confidence: 99%

Efficient generation of singlet oxygen due to localized surface plasmon resonance of silver nanoparticles in rose bengal–silver nanoparticle composite films

Yonemura

Motomura

2023

Self Cite

Effect of silver nanoparticle (AgNP) on the generation of singlet oxygen (1O2*) using a rose bengal (RB) as a photosensitizer for photodynamic therapy (PDT) were examined by measuring the phosphorescence spectra of 1O2* from RB-AgNP composite film and RB film on glass plates in CCl4. 1O2* was successfully detected by direct observation of the characteristic 1O2* phosphorescence around 1275 nm in two films. The excitation spectra of 1O2* in two films were in agreement with the absorption spectrum of RB in RB film or in acetone solution. The results indicates that the generation of 1O2* is ascribed by the PDT type Ⅱ reaction. The phosphorescence intensity of 1O2* in RB-AgNP composite film was larger than that in RB film. The enhancement of the phosphorescence intensity of 1O2* is most likely attributable to large electric fields due to localized surface plasmon resonance of AgNP aggregates.