• Home
  • Search Results
  • Large reverse saturable absorption under weak continuous incoherent light.

Large reverse saturable absorption under weak continuous incoherent light.

Nature materials (2014-09-10)
Shuzo Hirata, Kenro Totani, Takashi Yamashita, Chihaya Adachi, Martin Vacha

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.

Product Number
Product Description

β-Estradiol, BioReagent, powder, suitable for cell culture
β-Estradiol, ≥98%
β-Estradiol, analytical standard
β-Estradiol, powder, γ-irradiated, suitable for cell culture
Estradiol, Pharmaceutical Secondary Standard; Certified Reference Material
17β-Estradiol solution, 1.0 mg/mL in acetonitrile, ampule of 1 mL, certified reference material, Cerilliant®
Estradiol hemihydrate, European Pharmacopoeia (EP) Reference Standard
Estradiol, United States Pharmacopeia (USP) Reference Standard
Estradiol, meets USP testing specifications