Transparent photothermal heaters using NIR absorbing dyes (Conference Presentation)

Minsu Han; Hwandong Jang; Eunkyoung Kim

doi:10.1117/12.2546341

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10 March 2020 Transparent photothermal heaters using NIR absorbing dyes (Conference Presentation)

Minsu Han, Hwandong Jang, Eunkyoung Kim

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Proceedings Volume 11277, Organic Photonic Materials and Devices XXII; 112770F (2020) https://doi.org/10.1117/12.2546341
Event: SPIE OPTO, 2020, San Francisco, California, United States

Abstract

Transparent photothermal (PT) materials absorbing NIR light have attracted strong interest for wireless soft robots, photothermal therapy, sensors, and wearable optoelectronic devices. Since PT materials convert light energy to heat energy, they can function as highly programmable wireless heaters and PT actuators, depending on the intensity and wavelength of the light source. However, transparent PT materials have been rarely researched because of the difficulty in absorption separation between the visible and NIR region in a molecule. Furthermore poor solubility of NIR dyes limit their application as a transparent film. Herein we present a transparent NIR dye having a transparency at visible region over 90 %. With a transparent binder, the NIR dye was fabricated as an NIR absorbing film, which showed high NIR photothermal conversion efficiency over 75 %. Taking advantage of the high photothermal effect of the film, we were able to generate a transparent photothermal heater that could be applied into desalination and actuation. The mechanism and application potential for the photothermal effect will be discussed based on the optical properties of the NIR dyes.

Conference Presentation

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Minsu Han, Hwandong Jang, and Eunkyoung Kim "Transparent photothermal heaters using NIR absorbing dyes (Conference Presentation)", Proc. SPIE 11277, Organic Photonic Materials and Devices XXII, 112770F (10 March 2020); https://doi.org/10.1117/12.2546341

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