Product Code: ICA12_M1001

Infrared-Visible Light Conversion Using DCM Dye Micrograins Embedded in a Resin Sheet and Application to an IR Sensor Card
Authors:
Tadashi Kawazoe, Electrical Engineering and Information Systems, The Univ. of Tokyo; Bunkyo-ku Japan
Tohru Fujita, Central Research Labs, Hamamatsu Photonics KK; Hamakita Japan
Hiroyasu Fujiwara, Central Research Labs, Hamamatsu Photonics KK; Hamakita Japan
Minoru Niigaki, Central Research Labs, Hamamatsu Photonics KK; Hamakita Japan
Motoichi Ohtsu, Electrical Engineering and Information Systems, The Univ. of Tokyo; Bunkyo-Ku, Tokyo Japan
Presented at ICALEO 2012

We report high-efficiency visible light emission (λ=600690 nm) from aggregated 4-dicyanomethylene-2-methyl-6-p-dimethylaminostyryl-4H-pyran (DCM) dye micrograins excited by infrared light (λex = 805 nm). The light-emitting regions were localized at the surfaces and edges of the micrograins, where the optical near-field was more intense. This has been theoretically explained by excitonphonon polaritons, i.e., the dressed photon model, in which an electron is excited due to a multistep transition via an intermediate phonon state coupled with a localized exciton polariton (a dressed photon). The lifetime (about 1 ps) of the intermediate state has been measured by the pumpprobe method. We prepared a resin sheet containing the DCM and identified the origin of the intermediate state as an O-H stretching vibration mode, by time-resolved Raman spectroscopy using a 10 fs pulsed laser as an excitation light source. As the molecules aggregated, the emission efficiency with visible light excitation (λ

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