TY  - JOUR
A1  - Sun, Meng‐Jia
A1  - Anhalt, Olga
A1  - Sárosi, Menyhárt B.
A1  - Stolte, Matthias
A1  - Würthner, Frank
T1  - Activating Organic Phosphorescence via Heavy Metal–π Interaction Induced Intersystem Crossing
JF  - Advanced Materials
N2  - Heavy‐atom‐containing clusters, nanocrystals, and other semiconductors can sensitize the triplet states of their surface‐bonded chromophores, but the energy loss, such as nonradiative deactivation, often prevents the synergistic light emission in their solid‐state coassemblies. Cocrystallization allows new combinations of molecules with complementary properties for achieving functionalities not available in single components. Here, the cocrystal formation that employs platinum(II) acetylacetonate (Pt(acac)\(_{2}\)) as a triplet sensitizer and electron‐deficient 1,4,5,8‐naphthalene diimides (NDIs) as organic phosphors is reported. The hybrid cocrystals exhibit room‐temperature phosphorescence confined in the low‐lying, long‐lived triplet state of NDIs with photoluminescence (PL) quantum yield (Φ\(_{PL}\)) exceeding 25% and a phosphorescence lifetime (τ\(_{Ph}\)) of 156 µs. This remarkable PL property benefits from the noncovalent electronic and spin–orbital coupling between the constituents.
KW  - cocrystallization
KW  - naphthalene diimide
KW  - phosphorescence
KW  - platinum complexes
KW  - triplet sensitization
Y1  - 2022
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-312248
VL  - 34
IS  - 51
ER  - 
TY  - THES
A1  - Röger, Cornelia
T1  - Bioinspired Light-Harvesting Zinc Chlorin Rod Aggregates Powered by Peripheral Chromophores
T1  - Bioinspirierte lichtsammelnde Zinchlorin-Stabaggregate
N2  - Artificial light-harvesting (LH) systems have been obtained by self-assembly of naphthalene diimide-functionalized zinc chlorin dyads and triad in nonpolar, aprotic solvents. UV-vis, CD, and steady-state emission spectroscopy as well as atomic force microscopy showed that rod-like structures are formed by excitonic interactions of zinc chlorin units, while the appended naphthalene diimide dyes do not aggregate at the periphery of the cylinders. In all cases, photoexcitation of the enveloping naphthalene diimides at 540 and 620 nm, respectively, was followed by highly efficient energy-transfer processes to the inner zinc chlorin backbone, as revealed by time-resolved fluorescence spectroscopy on the picosecond time-scale. As a consequence, the LH efficiencies of zinc chlorin rod aggregates were increased by up to 63%. The effective utilization of solar energy recommends these biomimetic systems for an application in electronic materials on the nanoscale.
N2  - In der vorliegenden Arbeit werden selbstorganisierte Lichtsammelsysteme auf der Basis von Napthalinbisimid-funktionalisierten Zinkchlorinen beschrieben.
KW  - Farbstoff
KW  - Scheibe-Aggregat
KW  - Naphthalinbisimid
KW  - Chlorin
KW  - Selbstorganisation
KW  - Lichtsammelsystem
KW  - Energietransfer
KW  - naphthalene diimide
KW  - chlorin
KW  - self-assembly
KW  - light harvesting
KW  - energy transfer
Y1  - 2007
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-26760
ER  -