Increase in exciton decay rate due to plane-to-plane interaction between cyanine thin films

Nagauchi, Junpei; Kojima, Osamu; Shim, YongGu

doi:10.1063/1.4959191

Cited by 3 publications

(4 citation statements)

References 46 publications

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“…The pump-pump separation Δ pump of 250 ps corresponds to a 4 GHz repetition rate. As previously reported, 30 the fast relaxation component appears in the DP thin film and does not originate from the response of the PSA1411 layer. The fast relaxation in the DP thin film originates from interactions between excitons in the DTTCI and those in the PSA1411 molecules.…”

Section: Resultssupporting

confidence: 81%

“…Recently, an enhanced exciton decay rate was reported in double-layer cyanine thin films. 29,30 To realize ultrafast optical switches, it is important to understand the phenomenon induced by an increase in the excitation intensity and that induced by the sequential excitation. Therefore, in this study, we investigate how the excitation intensity and sequence affect the decay dynamics of excitons in the single-and double-layer cyanine thin films, where the single-layer sample shows the intrinsic exciton dynamics and the double-layer sample shows the modified exciton dynamics.…”

Section: Introductionmentioning

confidence: 99%

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Exciton dynamics as a function of excitation intensity and double-pulse excitation in cyanine molecule thin films: Toward low-power optical switches

Kojima

Nagauchi

2019

Journal of Applied Physics

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Exciton decay dynamics can be optically controlled by changing the excitation conditions, particularly, the excitation intensity. In this study, we report how the exciton dynamics in cyanine thin films depend on the excitation intensity and sequence. The excitons in these films have two decay components, and the ratio of the population of the fast decay component to the total population depends on the excitation intensity. Conversely, sequential excitation by a second optical pulse does not alter this ratio. Although the total excitation power is comparable, the change in the dynamics by the second pulse is different from the simple increase in the excitation power. Therefore, the sequential excitation by the second pulse can be a key point for realizing low-power optical switches.

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Section: Resultssupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Exciton dynamics as a function of excitation intensity and double-pulse excitation in cyanine molecule thin films: Toward low-power optical switches

Kojima

Nagauchi

2019

Journal of Applied Physics

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“…The DTTCI thin film was fabricated on the (001) Si substrate using the layer-by-layer method. [23][24][25][26][27][28][29] The detail of the sample fabrication is available from the reference. 21) The thickness of the DTTCI thin film and the separation between the DTTCI film and the substrate were 6.7 nm and 6.0 nm, respectively, which were determined using a spectroscopic phase-modulated ellipsometer (HORIBA Jobin-Yvon UVISEL-TK9017TK).…”

Section: Experimental Methodsmentioning

confidence: 99%

Electron transport in a silicon crystal observed by energy transfer luminescence

Kojima

Ito

Shim

2020

Jpn. J. Appl. Phys.

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This study investigates electron diffusion based on the observation of luminescence from a cyanine thin film fabricated on a semiconductor substrate. When the backside of the substrate was excited by laser light, enlarged intensity profiles, 20 times larger than the laser spot, were observed. An analysis of the spatial enlargement suggests that the enlargement originated from electron diffusion. This method can be used for analyzing electron transport and contributes to the development of emission devices based on energy transfer.

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“…Moreover, previously we reported the fabrication of the cyanine molecule thin film on the glass substrate. [31][32][33] Because the same fabrication process can be used, this combination was chosen. The p-type Si substrate with the nominal resistivity of 0.01-1.00 •cm, which acts as the energy donor, was polished to approximately between 500 and 200 m, and cleaned by immersion in a fresh piranha solution (2:5 v/v mixture of 30% H2O2 and 98% H2SO4) for 60 min.…”

Section: Methodsmentioning

confidence: 99%

Excitation of Thin Cyanine Films via Energy Transfer from Si Substrate

2017

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Energy transfer from an inorganic substrate to a cyanine molecule thin film has been investigated as an excitation method for organic luminescent devices. Cyanine molecule thin films were fabricated on a Si substrate using layer-by-layer assembly and were excited from the backside of the substrate to observe the luminescence. The luminescence intensity depends on the excitation power and excitation energy. Moreover, the dependence of the luminescence intensity on excitation energy clearly shows a profile similar to the absorption spectrum of Si. These results indicate that luminescence is not due to the direct optical excitation of cyanine by the light transmitted through the substrate but due to the energy transfer from the photoexcited carriers in the substrate. Our results demonstrate that such energy transfer can be used to excite organic molecules on inorganic substrates without energy matching between the electrodes and luminescent materials.

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Increase in exciton decay rate due to plane-to-plane interaction between cyanine thin films

Cited by 3 publications

References 46 publications

Exciton dynamics as a function of excitation intensity and double-pulse excitation in cyanine molecule thin films: Toward low-power optical switches

Exciton dynamics as a function of excitation intensity and double-pulse excitation in cyanine molecule thin films: Toward low-power optical switches

Electron transport in a silicon crystal observed by energy transfer luminescence

Excitation of Thin Cyanine Films via Energy Transfer from Si Substrate

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