Journal
NATURE MATERIALS
Volume 13, Issue 10, Pages 938-946Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT4081
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Funding
- Funding Program for world-Leading Innovative R&D on science and Technology (FIRST) [22750132, 26708010]
- Japan Association for Chemical Innovation grant
- Japan Bioindustry Association grant
- Tokyo Tech Engineering Grant
- Cosmetology Research Foundation
- Sumitomo Foundation
- Adaptable and Seamless Technology Transfer Program through Trarget-driven RD [AS231Z01236B]
- Grants-in-Aid for Scientific Research [26708010, 22750132, 26289062] Funding Source: KAKEN
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In materials showing reverse saturable absorption (RSA), the optical absorbance increases as the power of the light incident on them increases. To date, RSA has only been observed when very intense light sources, such as short-pulse lasers, are used. Here, we show that hydroxyl steroidal matrices embedding properly designed aromatic molecules as acceptors and transition-metal complexes as donors exhibit high RSA on exposure to weak incoherent light at room temperature and in air. Accumulation by photosensitization of long-lived room-temperature triplet excitons in acceptors with a large triplettriplet absorption coefficient allows a nonlinear increase in absorbance also under low-power irradiation conditions. As a consequence, continuous exposure to weak light significantly decreases the transmittance of thin films fabricated with these compounds. These optical limiting properties may be used to protect eyes and light sensors from exposure to intense radiation generated by incoherent sources and for other light-absorption applications that have not been realized with conventional RSA materials.
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