Two-photon absorption and optical power limiting of bifluorene molecule

Morel, Yannick; Irimia, A.; Najechalski, P.; Kervella, Yann; Stéphan, Olivier; Baldeck, Patrice L.; Andraud, Chantal

doi:10.1063/1.1351160

Cited by 156 publications

(108 citation statements)

References 18 publications

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“…This has already been demonstrated for branched chromophores built from the gathering of either dipolar [108][109][110][111][112][113][114][115][116][117][118][119][120][121][122][123] or quadrupolar [97,102,[124][125][126] sub-chromophores via common conjugated core moieties and multichromophore structures in which subchromophores interact only via electrostatic interactions. [127] Alternative routes such as those based on porphyrins, [128][129][130][131][132][133][134][135][136] oligomers and polymers [103,[137][138][139] have been explored as well. The level of complexity has been increased even further by studying dendritic species such as conjugated dendrimers, [115,118,[140][141][142] multichromophoric dendrimers [143] and nanodots.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Two‐Photon Absorption of Organic Chromophores: Theoretical and Experimental Assessments

et al. 2008

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Section: Introductionmentioning

confidence: 99%

Enhanced Two‐Photon Absorption of Organic Chromophores: Theoretical and Experimental Assessments

et al. 2008

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“…Multiphoton absorption has also attracted considerable attention for optical limiting [27][28][29][30][31][32][33][34][35][36][37][38][39] mainly focusing on optical limiting in the visible region aiming at eye-protection. [37][38][39] Whereas a number of multiphoton chromophores have been designed and studied in that context, only scarce effort has been dedicated to the protection of NIR detectors typically working in the 700-900 nm region.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Fluorescence, and Two‐Photon Absorption of a Series of Elongated Rodlike and Banana‐Shaped Quadrupolar Fluorophores: A Comprehensive Study of Structure–Property Relationships

Mongin

Porrès

Charlot

et al. 2007

Chemistry A European J

240

204

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An extensive series of push-push and pull-pull derivatives was prepared from the symmetrical functionalization of an ambivalent core with conjugated rods made from arylenevinylene or arylene-ethynylene building blocks, bearing different acceptor or donor endgroups. Their absorption and photoluminescence as well as their two-photon absorption (TPA) properties in the near infrared (NIR) region have been systematically investigated in order to derive structure-property relationships and lay the guidelines for both spectral tuning and amplification of molecular TPA in the target region. Whatever the nature of the core or of the connectors, push-push systems were found to be more efficient than pull-pull systems and planarization of the core (fluorene vs biphenyl) always leads to an increase of the TPA crosssections. At contrary, increasing the conjugation length as well as replacement of a phenylene moiety by a thienylene moiety in the conjugated rods did not necessarily lead to increased TPA responses. The present study also demonstrated that the topology of the conjugated rods can dramatically influence the TPA properties. This is of particular interest in terms of molecular engineering for specific applications since both TPA properties and photoluminescence characteristics can be considerably affected. It thus becomes possible to optimize the transparency/TPA and fluorescence/TPA efficiency trade-offs, for optical limiting in the red-NIR region (700-900 nm) and TPEF microscopy applications, respectively.

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“…The two-photon absorption cross-section for bisfluorene was previously measured to be 60 Â 10 À50 cm 4 s photon À1 in nanosecond optical limiting experiments. [27] Our results clearly demonstrate that the addition of suitable dendrons can lead to a significant increase in the peak two-photon absorption cross section, highlighting the effect of the dendrons on the nonlinear absorption of the molecules. However, the similarities in absorption and emission spectra suggest that the excited states remain largely localized in the emissive chromophore.…”

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confidence: 77%

Two‐Photon Absorption and Lasing in First‐Generation Bisfluorene Dendrimers

et al. 2008

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There has been a great interest in recent years in organic nonlinear optical materials for their applications in photonics and optoelectronics. In particular, materials displaying twophoton absorption and efficient two-photon fluorescence are attractive for applications such as optical limiting, [1,2] optical data storage, [3] two-photon fluorescence microscopy, [4] and two-photon pumped lasing.[5] Two-photon pumped lasing is of increasing interest for making smaller, simpler and cheaper visible laser systems, as the gain medium can be pumped at red or near-infrared wavelengths for which laser diodes are inexpensive and more powerful than lasers needed for single-photon pumping. In addition, as the gain medium can be optically pumped at a wavelength longer than that of the laser emission, there is potential to increase the lifetime and photostability of the material.[6] Two-photon pumped lasing in organic small molecules has been demonstrated in the past in dye solutions [7,8] as well as in dye-doped organogels [9] and dye-doped polymer films.[10]In this context, organic semiconductors emerge as attractive candidates, owing to their high gain coefficients, low concentration quenching and optical losses, and ease of processing. [11][12][13] In addition, large molecules with delocalized electrons can display substantial optical nonlinearities and these properties can be further enhanced and tuned by means of synthetic chemistry. [14][15][16] Among these organic materials, conjugated dendrimers are a special category of organic semiconductors where different properties can be assigned to different parts of the macromolecule, allowing for greater flexibility in the design of materials with specific properties.[17]These molecules commonly consist of a central core containing a conjugated chromophore that determines the optical and electronic properties, a number of dendrons branching out of the core that control the intermolecular interactions and a set of surface groups that control the solubility of the molecule. [18][19][20] Changing any of these properties only requires change of part of the structure, which increases the flexibility for tailoring the materials to particular applications. In addition, they are highly processable from solution, meaning that thin films can be deposited onto various substrates by simple techniques such as spin-coating, allowing for an easy and cost-effective integration into devices. Dendrimers have previously shown great potential for use as gain media in lasers [21,22] and have also been studied in the context of nonlinear absorption, for which the effects of the excited state delocalization and the generation of the dendrimer on the nonlinear optical properties were investigated. [23,24] In this Communication, we report on the study of two-photon absorption and photoluminescence properties of a series of first-generation blue-emitting bisfluorene-cored dendrimers. We show that by adding suitable dendrons we may substantially increase the two-photon absorption while not strongly af...

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Two-photon absorption and optical power limiting of bifluorene molecule

Cited by 156 publications

References 18 publications

Enhanced Two‐Photon Absorption of Organic Chromophores: Theoretical and Experimental Assessments

Enhanced Two‐Photon Absorption of Organic Chromophores: Theoretical and Experimental Assessments

Synthesis, Fluorescence, and Two‐Photon Absorption of a Series of Elongated Rodlike and Banana‐Shaped Quadrupolar Fluorophores: A Comprehensive Study of Structure–Property Relationships

Two‐Photon Absorption and Lasing in First‐Generation Bisfluorene Dendrimers

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