scholarly journals Multiplicity conversion based on intramolecular triplet-to-singlet energy transfer

2019 ◽  
Vol 5 (9) ◽  
pp. eaaw5978 ◽  
Author(s):  
A. Cravcenco ◽  
M. Hertzog ◽  
C. Ye ◽  
M. N. Iqbal ◽  
U. Mueller ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Triplet State ◽  
Triplet States ◽  
Spin States ◽  
Materials Chemistry ◽  
Excited Singlet ◽  
Excited Triplet ◽  
Dipole Interactions ◽  
Molecular Spin ◽  
Excited Triplet States

The ability to convert between molecular spin states is of utmost importance in materials chemistry. Förster-type energy transfer is based on dipole-dipole interactions and can therefore theoretically be used to convert between molecular spin states. Here, a molecular dyad that is capable of transferring energy from an excited triplet state to an excited singlet state is presented. The rate of conversion between these states was shown to be 36 times faster than the rate of emission from the isolated triplet state. This dyad provides the first solid proof that Förster-type triplet-to-singlet energy transfer is possible, revealing a method to increase the rate of light extraction from excited triplet states.

Intra- and Intermolecular Electronic Relaxation of the Second Excited Singlet and the Lowest Excited Triplet States of 1,3-Dimethyl-4-thiouracil in Solution¶

2002 ◽  
Vol 75 (5) ◽  
pp. 448 ◽  
Author(s):  
Katarzyna Taras-Goślińska ◽  
Grażyna Wenska ◽  
Bohdan Skalski ◽  
Andrzej Maciejewski ◽  
Gotard Burdziński ◽  
...  
Keyword(s):  
Electronic Relaxation ◽  
Triplet States ◽  
Excited Singlet ◽  
Excited Triplet ◽  
Excited Triplet States

Intra- and Intermolecular Electronic Relaxation of the Second Excited Singlet and the Lowest Excited Triplet States of 1,3-Dimethyl-4-thiouracil in Solution¶

2007 ◽  
Vol 75 (5) ◽  
pp. 448-456 ◽  
Author(s):  
Katarzyna Taras-Goślińska ◽  
Grażyna Wenska ◽  
Bohdan Skalski ◽  
Andrzej Maciejewski ◽  
Gotard Burdziński ◽  
...  
Keyword(s):  
Electronic Relaxation ◽  
Triplet States ◽  
Excited Singlet ◽  
Excited Triplet ◽  
Excited Triplet States

Fluorene-Type Polymer Photodetectors Doped with Iridium and Platinum Complexes as Opto-Electrical Conversion Devices

2012 ◽  
Vol 1435 ◽  
Author(s):  
Hirotake Kajii ◽  
Hiroki Ohmori ◽  
Yusuke Sato ◽  
Akihiro Katsura ◽  
Yutaka Ohmori
Keyword(s):  
Conversion Efficiency ◽  
Solution Process ◽  
Platinum Complexes ◽  
Triplet States ◽  
Excited Singlet ◽  
Excited Triplet ◽  
Optical Links ◽  
Singlet States ◽  
Excited Singlet States ◽  
Excited Triplet States

ABSTRACTTo improve the conversion efficiency of polymer photodetectors (PDs) fabricated by solution process, the properties of fluorene-type polymer photodetectors doped with iridium (Ir) and platinum (Pt) complexes were investigated. The devices based on poly(dioctylfluorene) and poly(dioctylfluorene-co-benzothiadiazole) (F8BT) had violet and blue sensitivity, respectively. Triplet materials can enhance the incident-photon-to-current conversion efficiency of the devices utilizing the fluorene-type polymers when their triplet levels are lower than the lowest excited singlet states of the host and higher than the lowest excited triplet states of the host. The transmission of a moving picture was successfully demonstrated using the bilayer F8BT device with green Ir complex as an opto-electrical conversion device. We demonstrate that the polymer PDs fabricated by solution process can be applied to short-range optical communication fields, such as opto-electrical conversion devices for optical links.

Nanosecond flash photolysis

1970 ◽  
Vol 315 (1521) ◽  
pp. 163-184 ◽  
Keyword(s):  
Flash Photolysis ◽  
Pulsed Laser ◽  
Triplet States ◽  
Excited Singlet ◽  
Excited Triplet ◽  
Singlet States ◽  
Time Region ◽  
Excited Singlet States ◽  
Chemical Events ◽  
Excited Triplet States

A flash photolysis system, using a pulsed laser as source, has been designed and used to study events having a duration of a few nanoseconds; an improvement over conventional flash techniques by a factor of a thousand. The apparatus incorporates both spectrographic and photoelectric monitoring techniques which are easily interchangeable and, apart from the laser itself, it is readily constructed from standard components. Its applications to the observation of the absorption spectra of excited singlet states, short-lived excited triplet states and chemical events in the nanosecond time region are described.

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