An indole-based low molecular weight glass-former giving materials with high cooperative photorefractive optical gain

Rocco Angelone, Marco Angiuli, Francesco Ciardelli, Arturo Colligiani, Francesco Greco, Annalisa Romano, Giacomo Ruggeri, Elpidio Tombari

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

A derivative of 2-methylindole, namely 3-[2-(4-nitrophenyl)ethenyl]-1-(2-ethylhexyl)-2-metylindole (NPEMI-E) has been synthesized. Materials obtained from this molecule have been studied as thin films between two ITO layers. The study revealed that NPEMI-E collects in itself both photoconductivity and NLO characteristics. Differential Scanning Calorimetry (DSC) measurements showed the formation of stable glass films characterized by a T g temperature lower than room temperature. Blends with the photoconductive poly-N-vinyl-2,3-dimethylindole (PVDMI) were also studied, giving again stable glass films independently of the wt.% contents of NPEMI-E. Photorefractivity measurements on both pure and blended NPEMI-E allowed to measure a value of the optical gain Γ = 627 cm -1 at an applied electric field E = 60 V/μm. This high value of Γ corresponds to a sharp maximum of the experimental trend of F as a function of the wt.% content of NPEMI-E. The corresponding content was wt.% = 91.5. The presence of this maximum induced us to make the hypothesis that, besides the well known reorientational contribution to the photorefractivity, a further mechanism (recently theoretically studied) is active in our blends. This mechanism arises in the interactions among the NLO polarized and polarizable moieties (cooperative effect). It can produce a rapid variation of some of the electrooptical parameters conditioning the extent of the photorefractivity. This can happen at a well defined mean intermolecular distance and hence at a well defined concentration of the NLO molecules.

Original languageEnglish
Title of host publicationOrganic Optoelectronics and Photonics II
Volume6192
DOIs
Publication statusPublished - 2006
Externally publishedYes
EventOrganic Optoelectronics and Photonics II - Strasbourg, France
Duration: 2006 Apr 32006 Apr 6

Other

OtherOrganic Optoelectronics and Photonics II
CountryFrance
CityStrasbourg
Period06/4/306/4/6

Fingerprint

photorefractivity
Optical gain
indoles
low molecular weights
Molecular weight
Glass
Molecules
glass
Photoconductivity
Differential scanning calorimetry
Electric fields
conditioning
Derivatives
ITO (semiconductors)
photoconductivity
Thin films
Temperature
molecules
heat measurement
trends

Keywords

  • Cooperative contribution
  • Low-molecular-weight-glass-forming molecules
  • Photorefractivity
  • Poly(1-vinylindoles)
  • Supramolecular systems

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Angelone, R., Angiuli, M., Ciardelli, F., Colligiani, A., Greco, F., Romano, A., ... Tombari, E. (2006). An indole-based low molecular weight glass-former giving materials with high cooperative photorefractive optical gain. In Organic Optoelectronics and Photonics II (Vol. 6192). [61922M] https://doi.org/10.1117/12.661692

An indole-based low molecular weight glass-former giving materials with high cooperative photorefractive optical gain. / Angelone, Rocco; Angiuli, Marco; Ciardelli, Francesco; Colligiani, Arturo; Greco, Francesco; Romano, Annalisa; Ruggeri, Giacomo; Tombari, Elpidio.

Organic Optoelectronics and Photonics II. Vol. 6192 2006. 61922M.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Angelone, R, Angiuli, M, Ciardelli, F, Colligiani, A, Greco, F, Romano, A, Ruggeri, G & Tombari, E 2006, An indole-based low molecular weight glass-former giving materials with high cooperative photorefractive optical gain. in Organic Optoelectronics and Photonics II. vol. 6192, 61922M, Organic Optoelectronics and Photonics II, Strasbourg, France, 06/4/3. https://doi.org/10.1117/12.661692
Angelone R, Angiuli M, Ciardelli F, Colligiani A, Greco F, Romano A et al. An indole-based low molecular weight glass-former giving materials with high cooperative photorefractive optical gain. In Organic Optoelectronics and Photonics II. Vol. 6192. 2006. 61922M https://doi.org/10.1117/12.661692
Angelone, Rocco ; Angiuli, Marco ; Ciardelli, Francesco ; Colligiani, Arturo ; Greco, Francesco ; Romano, Annalisa ; Ruggeri, Giacomo ; Tombari, Elpidio. / An indole-based low molecular weight glass-former giving materials with high cooperative photorefractive optical gain. Organic Optoelectronics and Photonics II. Vol. 6192 2006.
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abstract = "A derivative of 2-methylindole, namely 3-[2-(4-nitrophenyl)ethenyl]-1-(2-ethylhexyl)-2-metylindole (NPEMI-E) has been synthesized. Materials obtained from this molecule have been studied as thin films between two ITO layers. The study revealed that NPEMI-E collects in itself both photoconductivity and NLO characteristics. Differential Scanning Calorimetry (DSC) measurements showed the formation of stable glass films characterized by a T g temperature lower than room temperature. Blends with the photoconductive poly-N-vinyl-2,3-dimethylindole (PVDMI) were also studied, giving again stable glass films independently of the wt.{\%} contents of NPEMI-E. Photorefractivity measurements on both pure and blended NPEMI-E allowed to measure a value of the optical gain Γ = 627 cm -1 at an applied electric field E = 60 V/μm. This high value of Γ corresponds to a sharp maximum of the experimental trend of F as a function of the wt.{\%} content of NPEMI-E. The corresponding content was wt.{\%} = 91.5. The presence of this maximum induced us to make the hypothesis that, besides the well known reorientational contribution to the photorefractivity, a further mechanism (recently theoretically studied) is active in our blends. This mechanism arises in the interactions among the NLO polarized and polarizable moieties (cooperative effect). It can produce a rapid variation of some of the electrooptical parameters conditioning the extent of the photorefractivity. This can happen at a well defined mean intermolecular distance and hence at a well defined concentration of the NLO molecules.",
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AU - Ruggeri, Giacomo

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N2 - A derivative of 2-methylindole, namely 3-[2-(4-nitrophenyl)ethenyl]-1-(2-ethylhexyl)-2-metylindole (NPEMI-E) has been synthesized. Materials obtained from this molecule have been studied as thin films between two ITO layers. The study revealed that NPEMI-E collects in itself both photoconductivity and NLO characteristics. Differential Scanning Calorimetry (DSC) measurements showed the formation of stable glass films characterized by a T g temperature lower than room temperature. Blends with the photoconductive poly-N-vinyl-2,3-dimethylindole (PVDMI) were also studied, giving again stable glass films independently of the wt.% contents of NPEMI-E. Photorefractivity measurements on both pure and blended NPEMI-E allowed to measure a value of the optical gain Γ = 627 cm -1 at an applied electric field E = 60 V/μm. This high value of Γ corresponds to a sharp maximum of the experimental trend of F as a function of the wt.% content of NPEMI-E. The corresponding content was wt.% = 91.5. The presence of this maximum induced us to make the hypothesis that, besides the well known reorientational contribution to the photorefractivity, a further mechanism (recently theoretically studied) is active in our blends. This mechanism arises in the interactions among the NLO polarized and polarizable moieties (cooperative effect). It can produce a rapid variation of some of the electrooptical parameters conditioning the extent of the photorefractivity. This can happen at a well defined mean intermolecular distance and hence at a well defined concentration of the NLO molecules.

AB - A derivative of 2-methylindole, namely 3-[2-(4-nitrophenyl)ethenyl]-1-(2-ethylhexyl)-2-metylindole (NPEMI-E) has been synthesized. Materials obtained from this molecule have been studied as thin films between two ITO layers. The study revealed that NPEMI-E collects in itself both photoconductivity and NLO characteristics. Differential Scanning Calorimetry (DSC) measurements showed the formation of stable glass films characterized by a T g temperature lower than room temperature. Blends with the photoconductive poly-N-vinyl-2,3-dimethylindole (PVDMI) were also studied, giving again stable glass films independently of the wt.% contents of NPEMI-E. Photorefractivity measurements on both pure and blended NPEMI-E allowed to measure a value of the optical gain Γ = 627 cm -1 at an applied electric field E = 60 V/μm. This high value of Γ corresponds to a sharp maximum of the experimental trend of F as a function of the wt.% content of NPEMI-E. The corresponding content was wt.% = 91.5. The presence of this maximum induced us to make the hypothesis that, besides the well known reorientational contribution to the photorefractivity, a further mechanism (recently theoretically studied) is active in our blends. This mechanism arises in the interactions among the NLO polarized and polarizable moieties (cooperative effect). It can produce a rapid variation of some of the electrooptical parameters conditioning the extent of the photorefractivity. This can happen at a well defined mean intermolecular distance and hence at a well defined concentration of the NLO molecules.

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