Two-photon pumped upconverted lasing in dye doped polymer waveguides

1 Substituted 4-dicyanomethylene-4H-pyran (DCM) derivatives are widely used in quantum electronics and optoelectronics as active media of tunable lasers, emitting layers of organic light diodes [1,2], and nonlinearoptics media [3][4][5]. The active media based on substituted DCMs lase in the red spectral region in solutions and solid matrices [6,7], have high photochemical stability, and exhibit a broad emission band up to 120 nm. Their absorption and emission spectra practically do not overlap (the Stocks shift attains 160 nm). This makes it possible to obtain the high efficiency of emission conversion in both the transverse and longitudinal modes of excitation. Reabsorption losses are low even at high concentrations of active molecules.Some DCMs possess nonlinear optical properties. Recently, we have shown [8] that substituted DCMs attenuate the emission of the Nd-YAG laser second harmonics, but their attenuation coefficient ranks below that of fullerenes and polymethine or phthalocyanine dyes.The aim of this work was to study the photoprocesses occurring in the molecules of substituted DCMs and to reveal the effect of the molecular structure on their spectral and luminescent parameters. EXPERIMENTALThe structural formulas of the 4-dicyanomethylene-4H-pyrans under study are given below.The quantum-chemical study of photoprocesses occurring in these molecules was performed by the INDO/S method with the use of an original software package [9]. The use of this method allows us to build the complete scheme of electronically excited states of molecules, to calculate their dipole moment, oscillator strength, charge distribution in molecules, and the spec-1 e-mail:svet@elefot.tsu.ru tra of induced absorption from excited triplet and singlet states. The use of the theory of nonradiative transfer of the energy of electronic excitation in a molecule makes it possible to estimate the rate constants of deactivation processes [10], to establish their trends depending on the molecular structure, and to predict the molecular structures with given properties.The experimental studies of the photoprocesses in DCM were carried out with the use of a Specord M40 spectrophotometer and a Hitachi 85 spectrofluorimeter. The fluorescence quantum yield of the molecules was determined relative to Rhodamine C in ethanol ( γ = 0.65) according to the procedure described in [11].Ethyl acetate, ethanol, and dimethyl sulfoxide (DMSO) were used as solvents. Their purity was controlled by spectrophotometry. The concentration of the molecules under study was 10 -4 (in recording absorption spectra) and 10 -6 -10 -5 mol l -1 (in recording the spectra and measuring the quantum yields of fluorescence).Substituted DCMs under study were synthesized by Ponomareva O.V. (Dolgoprudnyi, NPF DELTAKOR) and were used without additional purification. RESULTS AND DISCUSSIONExperimental and calculated positions of the absorption band maximums of substituted DCM under study are listed in Table 1. Note that the experimental data agree well with the results obtained ...

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confidence: 99%

Theoretic and Experimental Study of Photoprocesses in Substituted 4-Dicyanomethylene-4H-pyrans

et al. 2005

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“…Under inten- Figure 3. UV-Vis and fluorescence emission spectra of (E,E,E)-1,3,5-tristyrylbenzene (1) and the synthesized two-photon absorbing polymer (7) sive laser excitation at 532 nm, however, a strong absorption is observed and an up-converted fluorescent emission occurs at 390 nm, which is featured for two two-photon absorption. The TPA cross-sections of molecule 1 and the polymer at 532 nm were determined using transmission twophoton absorption measurement [29].…”

Section: Resultsmentioning

confidence: 99%

“…For the last decade, synthesis of highly active organic two-photon absorbing materials has attracted much interest because of their importance in science and their potential applications in many fast-growing technological areas such as optical power limiting [1,2], three-dimensional (3-D) storage media [3,4], two-photon fluorescence microscopy [5,6], up-conversion lasing [7,8], and two-photon photodynamic therapy [9,10]. The fulfillment of above technological applications relies greatly on the development of organic materials with superior two-photon absorption (TPA) activities.…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis of two-photon absorbing polymers through radical copolymerization

Bi¹,

Wu²,

Xu³

2007

Express Polym. Lett.

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Abstract.A two-photon absorbing polymer has been prepared through radical copolymerization of methyl acrylate and a synthesized monomer containing a two-photon absorbing chromophore (E,E,E)-1,3,5-tristyrylbenzene (1), under conventional radical polymerization conditions. The synthesized polymer was characterized by nuclear magnetic resonance (NMR), infra-red spectroscopy (IR) and gel permeation chromatography (GPC). The linear and nonlinear optical properties were studied by measurement of UV-Vis absorption, fluorescent emission and two-photon cross-section. This synthetic strategy provided a facile approach for synthesis of photonic materials with adjustable chromophore concentration and high molecular weights.

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“…They are, for example, applicable to optical memory devices [5], microfabrication [6], up-conversion lazing [7], photodynamic therapy [8], two-photon microscopy [9], optical power limiting [10]. However, their designing and understanding remains a challenge and many current researches in this area are now focused on molecular materials [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Introduction to the intuitive engineering of homogeneous and isotropic two-photon absorbent molecular materials

Fortrie

Chermette

2005

Comptes Rendus. Chimie

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Two-photon pumped upconverted lasing in dye doped polymer waveguides

Cited by 148 publications

References 12 publications

Theoretic and Experimental Study of Photoprocesses in Substituted 4-Dicyanomethylene-4H-pyrans

Theoretic and Experimental Study of Photoprocesses in Substituted 4-Dicyanomethylene-4H-pyrans

Facile synthesis of two-photon absorbing polymers through radical copolymerization

Introduction to the intuitive engineering of homogeneous and isotropic two-photon absorbent molecular materials

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