scholarly journals Photoinduced absorption of conjugated polymer/C60 solutions: Evidence of triplet‐state photoexcitations and triplet‐energy transfer in poly(3‐alkylthiophene)

1994 ◽  
Vol 100 (12) ◽  
pp. 8641-8645 ◽  
Author(s):  
R. A. J. Janssen ◽  
N. S. Sariciftci ◽  
A. J. Heeger
Keyword(s):  
Energy Transfer ◽  
Triplet State ◽  
Conjugated Polymer ◽  
Photoinduced Absorption ◽  
Triplet Energy ◽  
Triplet Energy Transfer

Singlet and Triplet Energy Transfer in Phosphorescent Dye Doped Polymer Light Emitting Devices

2001 ◽  
Vol 708 ◽  
Author(s):  
Yong-Young Noh ◽  
Chang-Lyoul Lee ◽  
Hae Won Lee ◽  
Hyun-Nam Cho ◽  
Jang-Joo Kim
Keyword(s):  
Energy Transfer ◽  
Conjugated Polymer ◽  
Triplet Energy ◽  
Efficient Energy Transfer ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Host Materials ◽  
Triplet Energy Transfer ◽  
Polymer Light Emitting Devices ◽  
Doped Polymer

ABSTRACTEffect of host polymers on energy transfer in phosphorescent dye doped polymer light emitting devices has been investigated. Poly (N-vinylcarbazol) [PVK] and poly (9,9'-di-n-hexyl-2,7-fluorene-alt-1,4(2,5dinhexyloxy) phenylene) [PFHP] were examined as the host materials for the phosphorescent dyes fac tris(2-phenypyridine) irdium(III) [Ir(ppy)3] and 2,3,7,8,12,13,17,18-octaethyl-21H,23H-porphyrin platinum(II) [PtOEP]. The host and guest materials have the large spectrum overlap between the emission of the hosts and absorption of the guests. When the guests were doped in PVK, the singlet-singlet and triplet-triplet energy transfer took place efficiently. On the contrary, the energy transfer did not take place from φ-conjugated polymer PFHP to the guests, even though common requirements for Förster and Dexter energy transfer were fulfilled. Host aggregation in PFHP based phosphorescent dye doped light emitting devices can play an undesired role obstructing efficient energy transfer.

Triplet–Triplet Energy Transfer as a Reason for Quenching by Thionine of the Triplet State of Eosin in Complexes with Cucurbit[7, 8]urils in Water

2019 ◽  
Vol 53 (1) ◽  
pp. 22-25 ◽  
Author(s):  
T. V. Fedotova ◽  
V. N. Gutrov ◽  
G. V. Zakharova ◽  
A. K. Chibisov ◽  
M. V. Alfimov
Keyword(s):  
Energy Transfer ◽  
Triplet State ◽  
Triplet Energy ◽  
Triplet Energy Transfer

Intramolecular photosensitization of the pinene–ocimene rearrangement

2003 ◽  
Vol 81 (6) ◽  
pp. 669-672 ◽  
Author(s):  
Kevin McMahon ◽  
Peter J Wagner
Keyword(s):  
Energy Transfer ◽  
Triplet State ◽  
Uv Irradiation ◽  
Ring Opening ◽  
Para Position ◽  
Intramolecular Energy Transfer ◽  
Triplet Energy ◽  
Triplet Energy Transfer ◽  
Methylene Group

Bonding of nopol to the para position of acetophenone produces 5,5-dimethyl-2-(2-(p-acetylphenoxy)ethyl)bicyclo[3.1.1]hept-2-ene 1, which contains two chromophores: a para-alkoxyacetophenone and an α-pinene, connected by a single methylene group. UV irradiation of 1 in both benzene and methanol produces none of the intramolecular [2 + 2] cycloaddition that most para-(3-buten-1-oxy)acetophenones undergo. Instead, the pinene unit rearranges to a triene skeleton identical to that of ocimene, a known photoproduct of pinene. At modest conversion the diene portion of the triene is cis but gradually is converted to a 52:48 trans:cis ratio. It is concluded that intramolecular triplet energy transfer from the excited ketone chromophore forms the 1,2-biradical triplet state of the pinene moiety, which then undergoes cyclobutylcarbinyl ring opening to a 1,4-biradical that cleaves to the 1,3,6-triene structure of ocimene. This mechanism is suggested to be responsible for the earlier reported intermolecularly sensitized rearrangement of α-pinene to the ocimene isomers.Key words: intramolecular energy transfer, triplet pinene, cyclobutylcarbinyl ring opening, photosensitization.

scholarly journals Intra-molecular triplet energy transfer is a general approach to improve organic fluorophore photostability

2016 ◽  
Vol 15 (2) ◽  
pp. 196-203 ◽  
Author(s):  
Qinsi Zheng ◽  
Steffen Jockusch ◽  
Gabriel G. Rodríguez-Calero ◽  
Zhou Zhou ◽  
Hong Zhao ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Triplet State ◽  
Triplet Energy ◽  
Triplet Energy Transfer ◽  
Organic Fluorophore

The performance of structurally distinct fluorophores can be dramatically enhanced by intra-molecular triplet state quenching.

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