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Diphenylamine‐Substituted Cruciform Oligo(phenylene vinylene): Enhanced One‐ and Two‐Photon Excited Fluorescence in the Solid State
Author(s) -
He F.,
Tian L. L.,
Tian X. Y.,
Xu H.,
Wang Y. H.,
Xie W. J.,
Hanif M.,
Xia J. L.,
Shen F. Z.,
Yang B.,
Li F.,
Ma Y. G.,
Yang Y. Q.,
Shen J. C.
Publication year - 2007
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200600518
Subject(s) - materials science , cruciform , fluorescence , biphenyl , absorption (acoustics) , diphenylamine , molecule , photoluminescence , excited state , photochemistry , phenylene , quantum yield , crystallography , polymer , optoelectronics , chemistry , optics , organic chemistry , atomic physics , physics , metallurgy , composite material
1,4‐di(4′‐ N , N ‐diphenylaminostyryl)benzene (DPA‐DSB) is a well known compound with a large two‐photon absorption (TPA) section and strong fluorescence in solution. However, the ease with which it crystallizes results in the formation of discontinuous crystalline phases during vacuum deposition processes, thereby greatly limiting its applicability in solid‐state devices. A cruciform dimer of DPA‐DSB, 2,5,2′,5′‐tetra(4′‐ N , N ‐diphenylaminostyryl)biphenyl (DPA‐TSB) is reported, wherein two DPA‐DSB molecules are linked through a central biphenyl bond. The DPA‐TSB molecules take on a cruciform configuration because of the steric crowding around the central biphenyl core, which has the effect of efficiently suppressing crystalline and intermolecular interactions. The neat DPA‐TSB solid shows strong green–blue fluorescence because of both steady‐state absorption as well as TPA. The DPA‐TSB solid exhibits a photoluminescence (PL) efficiency (η solid ) of 29 % and a solid‐state two‐photon action cross section (δη solid ) of 954 GM (1 GM = 1 × 10 –50 cm 4 s photon –1 molecule –1 ), which is much greater than for the model compound DPA‐DSB (η solid = 16 % and δη solid = 150 GM, where δ is the TPA cross section and η is the fluorescence quantum yield). Based on its high PL efficiency, good film‐forming ability, and strong TPA, DPA‐TSB seems to be a good candidate for applications in solid‐state optical devices.