Large reverse saturable absorption under weak continuous incoherent light.
Identifieur interne : 000376 ( Main/Exploration ); précédent : 000375; suivant : 000377Large reverse saturable absorption under weak continuous incoherent light.
Auteurs : Shuzo Hirata [Japon] ; Kenro Totani [Japon] ; Takashi Yamashita [Japon] ; Chihaya Adachi [Japon] ; Martin Vacha [Japon]Source :
- Nature materials [ 1476-1122 ] ; 2014.
English descriptors
- KwdEn :
- MESH :
- chemical , chemistry : Estradiol, Steroids.
- chemical , radiation effects : Estradiol, Steroids.
- Absorption, Lasers, Light, Optical Phenomena, Photochemical Processes.
Abstract
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 triplet-triplet 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.
DOI: 10.1038/nmat4081
PubMed: 25194702
Affiliations:
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184-8588, Japan.</nlm:affiliation><country xml:lang="fr">Japon</country><wicri:regionArea>Department of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588</wicri:regionArea><placeName><settlement type="city">Tokyo</settlement></placeName></affiliation></author><author><name sortKey="Yamashita, Takashi" sort="Yamashita, Takashi" uniqKey="Yamashita T" first="Takashi" last="Yamashita">Takashi Yamashita</name><affiliation wicri:level="1"><nlm:affiliation>School of Computer Science, Tokyo University of Technology, Hachioji, Tokyo 192-0982, Japan.</nlm:affiliation><country xml:lang="fr">Japon</country><wicri:regionArea>School of Computer Science, Tokyo University of Technology, Hachioji, Tokyo 192-0982</wicri:regionArea><placeName><settlement type="city">Tokyo</settlement></placeName></affiliation></author><author><name sortKey="Adachi, Chihaya" sort="Adachi, Chihaya" uniqKey="Adachi C" first="Chihaya" last="Adachi">Chihaya Adachi</name><affiliation wicri:level="1"><nlm:affiliation>Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, Nishi-ku, Fukuoka 819-0395, Japan.</nlm:affiliation><country xml:lang="fr">Japon</country><wicri:regionArea>Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, Nishi-ku, Fukuoka 819-0395</wicri:regionArea><wicri:noRegion>Fukuoka 819-0395</wicri:noRegion></affiliation></author><author><name sortKey="Vacha, Martin" sort="Vacha, Martin" uniqKey="Vacha M" first="Martin" last="Vacha">Martin Vacha</name><affiliation wicri:level="1"><nlm:affiliation>Department of Organic and Polymeric Materials, Tokyo Institute of Technology, Meguro, Tokyo 152-8552, Japan.</nlm:affiliation><country xml:lang="fr">Japon</country><wicri:regionArea>Department of Organic and Polymeric Materials, Tokyo Institute of Technology, Meguro, Tokyo 152-8552</wicri:regionArea><placeName><settlement 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sortKey="Hirata, Shuzo" sort="Hirata, Shuzo" uniqKey="Hirata S" first="Shuzo" last="Hirata">Shuzo Hirata</name><affiliation wicri:level="1"><nlm:affiliation>Department of Organic and Polymeric Materials, Tokyo Institute of Technology, Meguro, Tokyo 152-8552, Japan.</nlm:affiliation><country xml:lang="fr">Japon</country><wicri:regionArea>Department of Organic and Polymeric Materials, Tokyo Institute of Technology, Meguro, Tokyo 152-8552</wicri:regionArea><placeName><settlement type="city">Tokyo</settlement></placeName></affiliation></author><author><name sortKey="Totani, Kenro" sort="Totani, Kenro" uniqKey="Totani K" first="Kenro" last="Totani">Kenro Totani</name><affiliation wicri:level="1"><nlm:affiliation>Department of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan.</nlm:affiliation><country xml:lang="fr">Japon</country><wicri:regionArea>Department of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588</wicri:regionArea><placeName><settlement type="city">Tokyo</settlement></placeName></affiliation></author><author><name sortKey="Yamashita, Takashi" sort="Yamashita, Takashi" uniqKey="Yamashita T" first="Takashi" last="Yamashita">Takashi Yamashita</name><affiliation wicri:level="1"><nlm:affiliation>School of Computer Science, Tokyo University of Technology, Hachioji, Tokyo 192-0982, Japan.</nlm:affiliation><country xml:lang="fr">Japon</country><wicri:regionArea>School of Computer Science, Tokyo University of Technology, Hachioji, Tokyo 192-0982</wicri:regionArea><placeName><settlement type="city">Tokyo</settlement></placeName></affiliation></author><author><name sortKey="Adachi, Chihaya" sort="Adachi, Chihaya" uniqKey="Adachi C" first="Chihaya" last="Adachi">Chihaya Adachi</name><affiliation wicri:level="1"><nlm:affiliation>Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, Nishi-ku, Fukuoka 819-0395, Japan.</nlm:affiliation><country xml:lang="fr">Japon</country><wicri:regionArea>Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, Nishi-ku, Fukuoka 819-0395</wicri:regionArea><wicri:noRegion>Fukuoka 819-0395</wicri:noRegion></affiliation></author><author><name sortKey="Vacha, Martin" sort="Vacha, Martin" uniqKey="Vacha M" first="Martin" last="Vacha">Martin Vacha</name><affiliation wicri:level="1"><nlm:affiliation>Department of Organic and Polymeric Materials, Tokyo Institute of Technology, Meguro, Tokyo 152-8552, Japan.</nlm:affiliation><country xml:lang="fr">Japon</country><wicri:regionArea>Department of Organic and Polymeric Materials, Tokyo Institute of Technology, Meguro, Tokyo 152-8552</wicri:regionArea><placeName><settlement type="city">Tokyo</settlement></placeName></affiliation></author></analytic><series><title level="j">Nature materials</title><idno type="ISSN">1476-1122</idno><imprint><date when="2014" type="published">2014</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Absorption</term><term>Estradiol (chemistry)</term><term>Estradiol (radiation effects)</term><term>Lasers</term><term>Light</term><term>Optical Phenomena</term><term>Photochemical Processes</term><term>Steroids (chemistry)</term><term>Steroids (radiation effects)</term></keywords><keywords scheme="MESH" type="chemical" qualifier="chemistry" xml:lang="en"><term>Estradiol</term><term>Steroids</term></keywords><keywords scheme="MESH" type="chemical" qualifier="radiation effects" xml:lang="en"><term>Estradiol</term><term>Steroids</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Absorption</term><term>Lasers</term><term>Light</term><term>Optical Phenomena</term><term>Photochemical Processes</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">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 triplet-triplet 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.</div></front></TEI><affiliations><list><country><li>Japon</li></country><settlement><li>Tokyo</li></settlement></list><tree><country name="Japon"><noRegion><name sortKey="Hirata, Shuzo" sort="Hirata, Shuzo" uniqKey="Hirata S" first="Shuzo" last="Hirata">Shuzo Hirata</name></noRegion><name sortKey="Adachi, Chihaya" sort="Adachi, Chihaya" uniqKey="Adachi C" first="Chihaya" last="Adachi">Chihaya Adachi</name><name sortKey="Totani, Kenro" sort="Totani, Kenro" uniqKey="Totani K" first="Kenro" last="Totani">Kenro Totani</name><name sortKey="Vacha, Martin" sort="Vacha, Martin" uniqKey="Vacha M" first="Martin" last="Vacha">Martin Vacha</name><name sortKey="Yamashita, Takashi" sort="Yamashita, Takashi" uniqKey="Yamashita T" first="Takashi" last="Yamashita">Takashi Yamashita</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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