Organics and Polymers with High Two-Photon Activities and their Applications

Lin, Tzu Chau; Chung, Sung Jae; Kim, Kyoung Soo; Wang, Xiaopeng; He, Guang S.; Swiatkiewicz, Jacek; Pudavar, Haridas E.; Prasad, Paras N.

doi:10.1007/3-540-45642-2_3

Cited by 114 publications

(37 citation statements)

References 81 publications

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“…Gegenwärtig herrscht ein großer Bedarf an effizienten 2PA-Farbstoffen für eine breite Anwendungspalette, die von der Mikroskopie [5,6] und Mikrofabrikation [7] über dreidimensionale Datenspeicher, [8,9] optische Leistungsbegrenzung, [10] Upconversion-Laser [11] und photodynamische Therapie [12] bis hin zur lokalisierten Freisetzung biologisch aktiver Spezies reicht. [13] Kürzlich ist es durch Fortschritte beim Design und der Synthese von 2PA-Farbstoffen gelungen, diesem Bedarf nachzukommen.…”

Section: Einführungunclassified

Zweiphotonenabsorption und das Design von Zweiphotonenfarbstoffen

et al. 2009

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Zwei Photonen sind besser als eines – dieser Grundsatz gilt für einen großen Bereich von Anwendungen von den Ingenieurwissenschaften bis hin zur Physiologie. Durch Fortschritte beim Verständnis des Phänomens der Zweiphotonenabsorption und bei der Entwicklung von Zweiphotonenfarbstoffen gewinnt das Forschungsgebiet schnell an Bedeutung.magnified imageGegenüber der herkömmlichen Einphotonenabsorption bietet die Zweiphotonenabsorption etliche Vorteile, die zu Anwendungen in der Mikroskopie und Mikrofabrikation, der optischen Leistungsbegrenzung, in Upconversion‐Lasern und dreidimensionalen Datenspeichern, der photodynamischen Therapie und der lokalisierten Freisetzung biologisch aktiver Spezies geführt haben. Diese Anwendungen haben wiederum die Entwicklung neuartiger Farbstoffe mit großen Zweiphotonenabsorptionsquerschnitten vorangetrieben. Dieser Aufsatz beginnt mit den theoretischen Grundlagen der Zweiphotonenabsorption, stellt die Vielfalt möglicher Anwendungen vor und beschreibt erste Struktur‐Eigenschafts‐Beziehungen, die als Leitlinien bei der Entwicklung effizienter Zweiphotonenfarbstoffe dienen können.

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Section: Einführungunclassified

Zweiphotonenabsorption und das Design von Zweiphotonenfarbstoffen

et al. 2009

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“…The key criteria to develop efficient up-converting materials are: i) high two-photon absorption (TPA) efficiencies; ii) high fluorescence quantum yields (FQY); iii) high gain coefficients; and, iv) high chemical and photo-stabilities under laser irradiation. [7] While the multi-photon absorption properties of many organic and inorganic materials have been widely studied, few have satisfied these requirements as well as multi-shell inorganic semiconductor quantum dots (QDs). [8][9][10] One of the most lucrative properties of QDs is their sizetunable photoluminescence (PL) wavelength.…”

Section: Introductionmentioning

confidence: 99%

Soft‐Lithographed Up‐Converted Distributed Feedback Visible Lasers Based on CdSe–CdZnS–ZnS Quantum Dots

Todescato

Fortunati

Gardin

et al. 2011

Adv Funct Materials

101

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The development of a solution-deposited up-converted distributed feedback laser prototype is presented. It employs a sol-gel silica/germania soft-lithographed microcavity and CdSe-CdZnS-ZnS quantum dot/sol-gel zirconia composites as optical gain material. Characterization of the linear and nonlinear optical properties of quantum dots establishes their high absorption cross-sections in the one-and two-photon absorption regimes to be 1 × 10 −14 cm 2 and 5 × 10 4 GM, respectively. In addition, ultrafast transient absorption dynamics measurements of the graded seal quantum dots reveal that the Auger recombination lifetime is 220 ps, a value two times higher than that of the corresponding CdSe core. These factors enable the use of such quantum dots as optically pumped gain media, operating in the one-and two-photon absorption regime. The incorporation of CdSe-CdZnSZnS quantum dots within a zirconia host matrix affords a quantum-dot ink that can be directly deposited on our soft-lithographed distributed feedback grating to form an all-solution-processed microcavity laser.

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“…In recent years, considerable effort has been devoted to the design and investigation of chromophores with large TPA cross-sections, exploring in particular the possibility of obtaining optimized response due to the multipolar and/or (multi)branching strategy. 57 The experimental investigation of the branching effect has led to various trends: cooperative enhancement, 24,38,40,41 additive behavior, 36,37 or even reduction of TPA 37 have been reported. Among the reasons that lead to these apparently conflicting findings, two can be put forward.…”

Section: Introductionmentioning

confidence: 99%

Effects of (Multi)branching of Dipolar Chromophores on Photophysical Properties and Two-Photon Absorption

et al. 2005

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To investigate the effect of branching on linear and nonlinear optical properties, a specific series of chromophores, epitome of (multi)branched dipoles, has been thoroughly explored by a combined theoretical and experimental approach. Excited-state structure calculations based on quantum-chemical techniques (timedependent density functional theory) as well as a Frenkel exciton model nicely complement experimental photoluminescence and one-and two-photon absorption findings and contribute to their interpretation. This allowed us to get a deep insight into the nature of fundamental excited-state dynamics and the nonlinear optical (NLO) response involved. Both experiment and theory reveal that a multidimensional intramolecular charge transfer takes place from the donating moiety to the periphery of the branched molecules upon excitation, while fluorescence stems from an excited state localized on one of the dipolar branches. Branching is also observed to lead to cooperative enhancement of two-photon absorption (TPA) while maintaining high fluorescence quantum yield, thanks to localization of the emitting state. The comparison between results obtained in the Frenkel exciton scheme and ab initio results suggests the coherent coupling between branches as one of the possible mechanisms for the observed enhancement. New strategies for the rational design of NLO molecular assemblies are thus inferred on the basis of the acquired insights.

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Organics and Polymers with High Two-Photon Activities and their Applications

Cited by 114 publications

References 81 publications

Zweiphotonenabsorption und das Design von Zweiphotonenfarbstoffen

Zweiphotonenabsorption und das Design von Zweiphotonenfarbstoffen

Soft‐Lithographed Up‐Converted Distributed Feedback Visible Lasers Based on CdSe–CdZnS–ZnS Quantum Dots

Effects of (Multi)branching of Dipolar Chromophores on Photophysical Properties and Two-Photon Absorption

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