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    • 6. 发明授权
    • Magnetic switching of charge separation lifetimes in artificial photosynthetic reaction centers
    • 人工光合反应中心电荷分离寿命的磁切换
    • US06826321B1
    • 2004-11-30
    • US09806540
    • 2001-03-30
    • John D. Gust, Jr.Ana L. MooreThomas A. Moore
    • John D. Gust, Jr.Ana L. MooreThomas A. Moore
    • G02B626
    • H01L51/0047B82Y10/00B82Y20/00H01L51/0077H01L51/0093H01L51/0595H01L51/42Y02E10/549
    • Excitation of a triad artificial photosynthetic reaction center consisting of a porphyrin (P) convalently linked to a fullerene electron acceptor (C60) and a carotenoid secondary donor (C) leads to the formation of a long-lived C+-P-C60− charge-separated state via photoinduced electron transfer. This reaction occurs in a frozen organic glass down to at least 8 K. At 77 K, charge recombination of C*+-P-C60− occurs on the &mgr;s time scale, and yields solely the carotenoid triplet state. In the presence of a small (20 mT) static magnetic field, the lifetime of the charge-separated state is increased by 50%. This is ascribed to the effect of the magnetic field on interconversion of the singlet and triplet biradicals. At zero field, the initially formed singlet biradical state is in equilibrium with the three triplet biradical sublevels, and all four states have comparable populations. Decay to the carotenoid triplet only occurs from the three triplet sublevels. In the presence of the field, the S and T0 states are still rapidly interconverting, but the T+ and T− states are isolated from the other two due to the electronic Zeeman interaction, and are not significantly populated. Under these conditions, recombination to the triplet occurs only from T0, and the lifetime of the charge-separated state increases. This effect can be used as the basis for a magnetically controlled optical or optoelectronic switch (e.g. AND gate).
    • 由与富勒烯电子受体(C60)和类胡萝卜素二次供体(C)​​共价连接的卟啉(P)组成的三元组人造光合反应中心的激发导致形成长寿命C ++ P-C60 - 通过光致电子转移的电荷分离状态。 该反应发生在至少8K的冷冻有机玻璃中。在77K下,C * + -P-C60 - 的电荷重组发生在mus时间尺度上,仅产生类胡萝卜素三线态。 在存在小(20mT)静态磁场的情况下,电荷分离状态的寿命增加了50%。 这归因于磁场对单线态和三线态双向相互作用的影响。 在零场,初始形成的单线态双态状态与三个三线态双向子水平平衡,并且所有四个状态具有可比较的群体。 类胡萝卜素三联体的衰变仅发生在三个三线态亚层级。 在场的存在下,S和T0状态仍然是快速相互转换的,但由于电子塞曼交互,T +和T-状态与另外两个状态隔离,并且没有显着的填充。 在这些条件下,与三重态的复合只发生在T0,并且电荷分离状态的寿命增加。 该效果可以用作磁控光电开关(例如与门)的基础。
    • 8. 再颁专利
    • Magnetic switching of charge separation lifetimes in artificial photosynthetic reaction centers
    • 人工光合反应中心电荷分离寿命的磁切换
    • USRE41693E1
    • 2010-09-14
    • US11565506
    • 2006-11-30
    • John D. Gust, Jr.Ana L. MooreThomas Moore
    • John D. Gust, Jr.Ana L. MooreThomas Moore
    • G02B6/26G11C13/04H01R33/945F24J2/00
    • H01L51/0047B82Y10/00B82Y20/00H01L51/0077H01L51/0093H01L51/0595H01L51/42Y02E10/549
    • Excitation of a triad artificial photosynthetic reaction center consisting of a porphyrin (P) convalently linked to a fullerene electron acceptor (C60) and a carotenoid secondary donor (C) leads to the formation of a long-lived C+-P-C60− charge-separated state via photoinduced electron transfer. This reaction occurs in a frozen organic glass down to at least 8 K. At 77 K, charge recombination of C*+-P-C60− occurs on the μs time scale, and yields solely the carotenoid triplet state. In the presence of a small (20 mT) static magnetic field, the lifetime of the charge-separated state is increased by 50%. This is ascribed to the effect of the magnetic field on interconversion of the singlet and triplet biradicals. At zero field, the initially formed singlet biradical state is in equilibrium with the three triplet biradical sublevels, and all four states have comparable populations. Decay to the carotenoid triplet only occurs from the three triplet sublevels. In the presence of the field, the S and T0 states are still rapidly interconverting, but the T+ and T− states are isolated from the other two due to the electronic Zeeman interaction, and are not significantly populated. Under these conditions, recombination to the triplet occurs only from T0, and the lifetime of the charge-separated state increases. This effect can be used as the basis for a magnetically controlled optical or optoelectronic switch (e.g. AND gate).
    • 由与富勒烯电子受体(C60)和类胡萝卜素二次供体(C)​​共价连接的卟啉(P)组成的三元组人造光合反应中心的激发导致形成长寿命的C + -P-C60-电荷 - 通过光电子转移分离状态。 该反应发生在至少8K的冷冻有机玻璃中。在77K下,C * + -P-C60-的电荷重组发生在μs时间尺度上,仅产生类胡萝卜素三线态。 在存在小(20mT)静态磁场的情况下,电荷分离状态的寿命增加了50%。 这归因于磁场对单线态和三线态双向相互作用的影响。 在零场,初始形成的单线态双态状态与三个三线态双向子水平平衡,并且所有四个状态具有可比较的群体。 类胡萝卜素三联体的衰变仅发生在三个三线态亚层级。 在场的存在下,S和T0状态仍然是快速相互转换的,但由于电子塞曼交互,T +和T-状态与另外两个状态隔离,并且没有显着的填充。 在这些条件下,与三重态的复合只发生在T0,并且电荷分离状态的寿命增加。 该效果可以用作磁控光电开关(例如与门)的基础。