Photorefractive Polymer with Side-Chain Second-Order Nonlinear Optical and Charge-Transporting Groups

Zhao, Chanfeng; Park, Chi-Kyun; Prasad, Paras N.; Zhang, Yue; Ghosal, Saswati; Burzyński, Ryszard

doi:10.1021/cm00054a026

Cited by 67 publications

(49 citation statements)

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“…From a practical point of view, the optical amplification, Γ, must exceed the absorption loss, R, of the PR sample in question. [37][38][39] In this case, the optical loss of the sandwiched sample (glass/ITO/polymer composite/ITO/glass) at 1.31 µm was measured to be R ) 4.2 cm -1 yielding a maximum net gain coefficient of Γ -R ) 30.9 cm -1 . An example of asymmetric exchange of energy is depicted in the inset in Figure 3, which confirms the PR nature of the NCPbS composite.…”

Section: Resultsmentioning

confidence: 93%

Inorganic: Organic Hybrid Nanocomposites for Photorefractivity at Communication Wavelengths

et al. 2002

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This paper reports new photorefractive polymeric nanocomposites photosensitized with HgS or PbS nanocrystals and operating at the communication wavelength of 1.3 µm. To our knowledge, it is the first report of a polymeric photorefractive medium with spectral response at a communication wavelength. The nanocomposites involving HgS are prepared by an in-situ nanochemistry approach, whereas those involving PbS were prepared using competitive nanochemistry. Photoconductivity experiments were employed in the characterization of photocharge generation quantum efficiency provided by the semiconductor nanocrystals. The photorefractive nature of the composites is confirmed using electric field dependent two-beam coupling. In the case of nanocomposite containing PbS nanocrystals, a net gain in excess of the associated absorption loss is observed.

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Section: Resultsmentioning

confidence: 93%

Inorganic: Organic Hybrid Nanocomposites for Photorefractivity at Communication Wavelengths

et al. 2002

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“…These results of the effect of T g on the PR properties is the first report for the single component system to the best of our knowledge. Zhao et al [19] reported a low diffraction efficiency of 1% and gain coefficient of 10 cm À1 for the copolymer containing carbazole unit, which had T g at 47°C. For their system a higher T g may be the reason for the low PR properties.…”

Section: Resultsmentioning

confidence: 99%

“…The other approach is the utilization of side-chain polymers in which each component is chemically attached on the side chain to offer the structural flexibility of NLO moiety relative to the main-chain polymers [17±19]. Zhao et al [19] reported PR materials consisting of the methacrylate polymer containing a carbazole unit and a stilbene derivative in the side chain. They also introduced an octylmethacrylate as a comonomer to decrease T g , to enhance the structural flexibility.…”

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confidence: 99%

Synthesis and characterization of photorefractive polymers with triphenylamine unit and NLO chromophore unit on a side chain

Park

Ogino

Sato

2000

Polym. Adv. Technol.

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Acrylate‐type copolymers (TPA‐DCV) consisting of triphenylamine (TPA) unit as a hole transport agent and dicyanovinyl aniline (DCV) as a second‐order nonlinear optical (NLO) chromophore on a side chain were synthesized. The polymers showed good solubility and sufficient morphological stability after film formation. The diffraction efficiency and gain coefficient increased as glass transition temperature decreased TPA‐DCV composite doped with fullerene (C60) and dibutyl phthalate had a high photoconductivity of 5.1 × 10−12 S/cm at the applied electric field of 50 V/µm. Diffraction efficiency and response rate were measured as functions of the parameters determining the photoconductivity (e.g. applied electric field, the density of the photocharges generated and writing beam intensity). The maximum diffraction efficiency and gain coefficient were 12.9% and 64 cm−1, respectively, at an applied electric field of 80 V/µm. The maximum response time of 700 msec was obtained at the applied electric field of 80 V/µm. Photoconductivity, response rate and diffraction efficiency increased with the increase of the applied electric field. Field dependence of the response rate is attributed to the charge generation efficiency and/or the drift mobility. A similar power dependence of the photoconductivity and the response rate on the writing beam intensity was observed. The response rate and diffraction efficiency showed a good linear relationship with the logarithm of the photoconductivity. Copyright © 2000 John Wiley & Sons, Ltd.

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“…2-Aminothiophenol, 4-methylcinnamic acid, and 2-thiophenecarbaldehyde (4Ј) were obtained from Acros Ltd. 4-(Diethylamino)benzaldehyde (1Ј) and 4-(N-carbazolyl)benzaldehyde (3Ј) were synthesized according to a literature procedure. [25] 4-(Diphenylamino)benzaldehyde (2Ј) was prepared by a standard Vilsmeier reaction. All the solvents used for absorption and fluorescence measurements were HPLC grade.…”

Section: Methodsmentioning

confidence: 99%

Synthesis and Two‐Photon‐Excited Fluorescence of Benzothiazole‐Based Compounds with Various π‐Electron Donors

Cao¹,

Fang²,

Wang³

et al. 2003

Eur J Org Chem

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We have synthesized a series of new D−π−A compounds that feature various electron donors and a fixed benzothiazolyl unit as an electron acceptor. The crystal structure of compound 3 [trans,trans-2-{4-[(4-N-carbazolyl)styryl]styryl}-1,3-benzothiazole, CSSB] was determined. All these compounds show high fluorescence quantum yields and 3 in toluene gives the most intense blue emission around 450 nm with a quantum yield of Φ = 0.69. When excited at 800 nm by a Ti:sapphire femtosecond laser, these compounds exhibit strong two-photon-excited fluorescence (TPEF) in the blue-

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Photorefractive Polymer with Side-Chain Second-Order Nonlinear Optical and Charge-Transporting Groups

Cited by 67 publications

References 1 publication

Inorganic: Organic Hybrid Nanocomposites for Photorefractivity at Communication Wavelengths

Inorganic: Organic Hybrid Nanocomposites for Photorefractivity at Communication Wavelengths

Synthesis and characterization of photorefractive polymers with triphenylamine unit and NLO chromophore unit on a side chain

Synthesis and Two‐Photon‐Excited Fluorescence of Benzothiazole‐Based Compounds with Various π‐Electron Donors

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