Two-photon-pumped amplified spontaneous emission and cavity lasing of an organic dye HEASPS in PHEMA polymer

Zhou, Guangyong; Wang, Dong; Ren, Yan; Shao, Zongshu; Jiang, Minhua

doi:10.1007/s00340-004-1568-5

Cited by 7 publications

(3 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…7,8 This limits their application in some fields that require strong two-photon excited fluorescence (TPEF), such as upconverted lasing and bioimaging. [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] Dendrimers are synthetic, highly branched, monodisperse macromolecules that consist of a central core, one or more dendrons, and terminal groups. 24 Their 3-D architectures mimicking that of natural photosynthetic centers give them advantages for light harvesting.…”

Section: Introductionmentioning

confidence: 99%

“…In previous research, dipolar, quadrupolar, and multibranched molecules are the most frequently employed structural motifs for TPA materials. , It is known that 2-D arrays, macrocycles, and dendrimers offer new and enhanced TPA effects for this field . For 2-D arrays and macrocycles, large TPA cross sections (over 10 5 GM, 1 GM = 10 −50 cm 4 s/photon) have been achieved, but the fluorescence quantum yields are not valuable, mostly lower than 0.05. , This limits their application in some fields that require strong two-photon excited fluorescence (TPEF), such as upconverted lasing and bioimaging. − …”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Gigantic Two-Photon Absorption Cross Sections and Strong Two-Photon Excited Fluorescence in Pyrene Core Dendrimers with Fluorene/Carbazole as Dendrons and Acetylene as Linkages

Yan

Zhao

et al. 2010

J. Phys. Chem. B

View full text Add to dashboard Cite

We report a series of stiff dendrimers (referred to as T1, T2, T3, and T4) that have both gigantic two-photon absorption (TPA) cross sections up to 25,000 GM and strong two-photon excited fluorescence (TPEF) with fluorescence quantum yield of ∼0.5. The large TPA cross sections and high quantum yields of these dendrimers are directly related to their geometrical structures, where the polycyclic aromatic pyrene is chosen as the chromophoric core because of its planar and highly π-conjugated structure, fluorene moieties as dendrons extend the conjugation length through the planar structure, and carbazole moieties are modified at three-, six-, and nine-positions as electron donor. All of these groups are linked with acetylene linkage for effective π-electron delocalization, leading to large TPA cross section and high fluorescence quantum yield. The spectral properties of all dendrimers are investigated by one- and two-photon excitations. Furthermore, steady-state fluorescence excitation anisotropy and quantum chemical calculation are also employed to determine the structure-related mechanism of these dendrimers with gigantic TPA cross sections and high TPEF efficiency. We then show that the improvement of branched chains in the T-series dendrimers enhances the light-harvesting ability. The core emission spectra, fluorescence quantum yield, and fluorescence lifetime are almost invariable by directly exciting the dendrons. These results will provide a guideline for the design of useful two-photon materials with structural motifs that can enhance the TPA cross-section and fluorescence quantum yield of a molecule without causing a red shift of the one- and two-photon excitation wavelengths for specific applications.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Gigantic Two-Photon Absorption Cross Sections and Strong Two-Photon Excited Fluorescence in Pyrene Core Dendrimers with Fluorene/Carbazole as Dendrons and Acetylene as Linkages

Yan

Zhao

et al. 2010

J. Phys. Chem. B

View full text Add to dashboard Cite

show abstract

“…[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.…”

mentioning

confidence: 99%

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

et al. 2008

View full text Add to dashboard Cite

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...

show abstract

Effective multi-photon absorption properties in solutions of pyridinium salt lasing dyes

Fan

Wang

et al. 2007

Chemical Physics Letters

View full text Add to dashboard Cite

Two-photon-pumped amplified spontaneous emission and cavity lasing of an organic dye HEASPS in PHEMA polymer

Cited by 7 publications

References 12 publications

Gigantic Two-Photon Absorption Cross Sections and Strong Two-Photon Excited Fluorescence in Pyrene Core Dendrimers with Fluorene/Carbazole as Dendrons and Acetylene as Linkages

Gigantic Two-Photon Absorption Cross Sections and Strong Two-Photon Excited Fluorescence in Pyrene Core Dendrimers with Fluorene/Carbazole as Dendrons and Acetylene as Linkages

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

Effective multi-photon absorption properties in solutions of pyridinium salt lasing dyes

Contact Info

Product

Resources

About