External Heavy‐Atom Spin—Orbital Coupling Effect. V. Absorption Studies of Triplet States

1964 ◽  
Vol 40 (2) ◽  
pp. 507-515 ◽  
Author(s):  
S. P. McGlynn ◽  
T. Azumi ◽  
M. Kasha
1962 ◽  
Vol 37 (8) ◽  
pp. 1818-1824 ◽  
Author(s):  
S. P. McGlynn ◽  
R. Sunseri ◽  
N. Christodouleas

2008 ◽  
Vol 103 (10) ◽  
pp. 103905 ◽  
Author(s):  
Z. H. Yang ◽  
Y. H. Yang ◽  
J. Wang ◽  
K. S. Chan

2006 ◽  
Vol 974 ◽  
Author(s):  
Zhihua Xu ◽  
Bin Hu

ABSTRACTWe report an enhancement of photovoltaic response by dispersing phosphorescent dye fac tris (2-phenylpyridine) iridium (Ir(ppy)3) in organic solar cells of poly[2-methoxy-5-(2¡¦-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) doped with surface-functionalized fullerene 1-(3-methyloxycarbonyl)propy(1-phenyl [6,6] C61 (PCBM). It is known that photoexcitation generates both singlet and triplet states through intersystem crossing caused by hyperfine or spin-orbital coupling. Due to long diffusion length the triplet excitons can migrate from their generation sites to the interfaces of donor-acceptor interaction and directly dissociate into charge carriers. We found, based on the studies of magnetic field-dependent photocurrent, that the dispersed Ir(ppy)3 molecules increase the spin-orbital coupling strength and triplet density in the MEH-PPV matrix due to the penetration of MEH-PPV π electrons into the large field of orbital dipoles of the Ir(ppy)3. Especially, the triplet excitons facilitate the direct dissociation into charge carriers at the donor-acceptor interacting interfaces in the composite of MEH-PPV and PCBM, and consequently improve the photovoltaic response in organic solar cells.


2020 ◽  
Vol 128 (23) ◽  
pp. 234106
Author(s):  
C. F. Li ◽  
Y. Q. Li ◽  
Y. S. Tang ◽  
S. H. Zheng ◽  
J. H. Zhang ◽  
...  

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