Pub Date : 2001-10-01DOI: 10.1080/10587250108030067
Kyung Lim Paik, Hwan-Kyu Kim
Abstract We have investigated the development of lanthanide-cored supramolecular complexes containing porphyrins to circumvent the solubility problem and maximize the optical amplification properties. Their chemical structures were identified by FT-IR, 1H-NMR, UV-Vis absorption and emission spectroscopies. FB-Por 1 and 2 show a very intense UV-visible absorption band at 419 nm, which is attributed to the Soret band. In addition, the relatively weak bands at 516, 551, 591 and 647 nm are assigned to the Q bands. Upon a photoexcitation wavelength with 430 nm, the PL spectra of FB-Por 1 and 2 exhibit a strong band at 653 nm and a weak peak at 715 nm. Zn-Por 1 and 2 show a very intense band at 420 nm for B-band π∽π* transitions. In addition, the weak bands at 547 and 585 nm were assigned to the Q bands. With an excitation wavelength of 430 nm, the PL spectra of Zn-Por 1 and 2 show a moderate band at 596 nm and a strong band at 646 nm.
{"title":"Synthesis and Luminescent Properties of Lanthanide-Cored Supramolecular Complexes Based on Porphyrins for Optical Amplification","authors":"Kyung Lim Paik, Hwan-Kyu Kim","doi":"10.1080/10587250108030067","DOIUrl":"https://doi.org/10.1080/10587250108030067","url":null,"abstract":"Abstract We have investigated the development of lanthanide-cored supramolecular complexes containing porphyrins to circumvent the solubility problem and maximize the optical amplification properties. Their chemical structures were identified by FT-IR, 1H-NMR, UV-Vis absorption and emission spectroscopies. FB-Por 1 and 2 show a very intense UV-visible absorption band at 419 nm, which is attributed to the Soret band. In addition, the relatively weak bands at 516, 551, 591 and 647 nm are assigned to the Q bands. Upon a photoexcitation wavelength with 430 nm, the PL spectra of FB-Por 1 and 2 exhibit a strong band at 653 nm and a weak peak at 715 nm. Zn-Por 1 and 2 show a very intense band at 420 nm for B-band π∽π* transitions. In addition, the weak bands at 547 and 585 nm were assigned to the Q bands. With an excitation wavelength of 430 nm, the PL spectra of Zn-Por 1 and 2 show a moderate band at 596 nm and a strong band at 646 nm.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"24 1","pages":"185 - 188"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83257064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10587250108030060
K. Lee, Jong Hyoup Lee, Haeyoung Choi, M. Cha, M. Chung, Young Jun Kim, Sang-Don Jung
Abstract High two-photon absorption (TPA) molecule having a fluorene π-center (TP-Flu-TP) was prepared by the Heck reaction of 2,7-dibromo-9,9-diethylhexyl-9H-fluorene and 4-(diphenylamino)benzstyrene. The linear absorption maximum of the TP-Flu-TP was observed at 410 nm. The dispersion of the TPA intensity for the chromophore was measured by nonlinear transmission using 7 ns laser pulse. Since the maximum wavelength of this molecule occurred at 740 nm, we fixed the pumping wavelength at 740 nm for TP-Flu-TP and measured the transmitted pulse energy versus the input pulse energy. From this experiment we observed a distinct nonlinearity from TP-Flu-TP demonstrating that it is a potential material for optical limiting. The calculated two-photon absorption cross section (Δ) by the Hartree-Fock Hamiltonian with single configuration interaction formalism was 1.37 × 10−47 cm4 sec/photon.
{"title":"Fluorene-Based Organic Molecule with High Two-Photon Absorption Activities","authors":"K. Lee, Jong Hyoup Lee, Haeyoung Choi, M. Cha, M. Chung, Young Jun Kim, Sang-Don Jung","doi":"10.1080/10587250108030060","DOIUrl":"https://doi.org/10.1080/10587250108030060","url":null,"abstract":"Abstract High two-photon absorption (TPA) molecule having a fluorene π-center (TP-Flu-TP) was prepared by the Heck reaction of 2,7-dibromo-9,9-diethylhexyl-9H-fluorene and 4-(diphenylamino)benzstyrene. The linear absorption maximum of the TP-Flu-TP was observed at 410 nm. The dispersion of the TPA intensity for the chromophore was measured by nonlinear transmission using 7 ns laser pulse. Since the maximum wavelength of this molecule occurred at 740 nm, we fixed the pumping wavelength at 740 nm for TP-Flu-TP and measured the transmitted pulse energy versus the input pulse energy. From this experiment we observed a distinct nonlinearity from TP-Flu-TP demonstrating that it is a potential material for optical limiting. The calculated two-photon absorption cross section (Δ) by the Hartree-Fock Hamiltonian with single configuration interaction formalism was 1.37 × 10−47 cm4 sec/photon.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"2 1","pages":"155 - 159"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78772122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10587250108024741
Hooi-Sung Kim, T. Heo, Mi-Ra Kim, C. Ha, Jin-Kook Lee
Abstract Optical properties of polyimide film with dispersed metalloporphyrin (ZnTPDPI) and those of polyimide film containing tetraphenyl-porphyrinzinc in polymer backbone (POTPPI) were compared. For ZnTPDPI, the increase of the content of ZnTPP in PI film exhibited the increase of absorption and emission. POTPPI showed higher emission and absorption than ZnTPDPI. Relative fluorescence quantum yield of POTPPI was 0.218, while that of ZnTPDPI was 0.125.
{"title":"Comparison of Optical Properties of Porphyrin Dispersed Polyimide and Porphyrin Incorporated Polyimide into the Main Chain","authors":"Hooi-Sung Kim, T. Heo, Mi-Ra Kim, C. Ha, Jin-Kook Lee","doi":"10.1080/10587250108024741","DOIUrl":"https://doi.org/10.1080/10587250108024741","url":null,"abstract":"Abstract Optical properties of polyimide film with dispersed metalloporphyrin (ZnTPDPI) and those of polyimide film containing tetraphenyl-porphyrinzinc in polymer backbone (POTPPI) were compared. For ZnTPDPI, the increase of the content of ZnTPP in PI film exhibited the increase of absorption and emission. POTPPI showed higher emission and absorption than ZnTPDPI. Relative fluorescence quantum yield of POTPPI was 0.218, while that of ZnTPDPI was 0.125.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"27 1","pages":"281 - 284"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87587092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10587250108030087
R. Yuge, A. Miyazaki, T. Enoki, E. Ito, F. Nakamura, M. Hara
Abstract Self-assembled monolayer of mesoscopic size with Tetrathiafuluvalene (TTF) skeleton has attracted because it is expected to have quantum size effect for perpendicular to the substrate as well as two-dimensional π-electron interaction. Surface plasmon resonance (SPR) revealed that TTF-CH2SH monolayer is formed on Au (111) only at proper concentration. The presence of etch pits which is characteristic to chemisorbed SAMs was confirmed by scanning tunneling microscopy (STM). From those SPR and STM results, it has been suggested that the molecular long axis of TTF-CH2SH was aligned nearly perpendicular to the substrate. In addition, cyclic voltammogram (CV) result indicates that TTF-thiolate SAMs on gold electrode are stable in repeated scans.
{"title":"Characterization and Electronic Properties of TTF SAMs on Au (111)","authors":"R. Yuge, A. Miyazaki, T. Enoki, E. Ito, F. Nakamura, M. Hara","doi":"10.1080/10587250108030087","DOIUrl":"https://doi.org/10.1080/10587250108030087","url":null,"abstract":"Abstract Self-assembled monolayer of mesoscopic size with Tetrathiafuluvalene (TTF) skeleton has attracted because it is expected to have quantum size effect for perpendicular to the substrate as well as two-dimensional π-electron interaction. Surface plasmon resonance (SPR) revealed that TTF-CH2SH monolayer is formed on Au (111) only at proper concentration. The presence of etch pits which is characteristic to chemisorbed SAMs was confirmed by scanning tunneling microscopy (STM). From those SPR and STM results, it has been suggested that the molecular long axis of TTF-CH2SH was aligned nearly perpendicular to the substrate. In addition, cyclic voltammogram (CV) result indicates that TTF-thiolate SAMs on gold electrode are stable in repeated scans.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"25 1","pages":"273 - 276"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85797121","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10587250108030022
D. Sandman
{"title":"A Review of “The New Chemistry” editor-in-chief Nina Hall, Cambridge University Press, 2000; ISBN 0 521 45224 4; xi + 493 pages; $49.95","authors":"D. Sandman","doi":"10.1080/10587250108030022","DOIUrl":"https://doi.org/10.1080/10587250108030022","url":null,"abstract":"","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"20 1","pages":"273 - 273"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78904411","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10587250108024744
Jongsun Lim, Hyungjun Cho, G. Park
Abstract Electro-optical measurements of ferroelectric copolymers of vinylidene fluoride (VDF) and trifluoroethylene (TrFE) with VDF molar contents of 72 mol% and 50 mol% have been studied. Through the study of the relaxation dynamics of the EO coefficient for the P(VDF/TrFE) copolymer, it was found that the poling process improve temporal stability of P(VDF/TrFE) 50/50 mol% poled at room temperature and 72/28 mol% copolymer poled at near Tc.
{"title":"Electro-Optical Measurements of Ferroelectric Copolymers of Vinylidene Fluoride and Trifluoroethylene","authors":"Jongsun Lim, Hyungjun Cho, G. Park","doi":"10.1080/10587250108024744","DOIUrl":"https://doi.org/10.1080/10587250108024744","url":null,"abstract":"Abstract Electro-optical measurements of ferroelectric copolymers of vinylidene fluoride (VDF) and trifluoroethylene (TrFE) with VDF molar contents of 72 mol% and 50 mol% have been studied. Through the study of the relaxation dynamics of the EO coefficient for the P(VDF/TrFE) copolymer, it was found that the poling process improve temporal stability of P(VDF/TrFE) 50/50 mol% poled at room temperature and 72/28 mol% copolymer poled at near Tc.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"28 1 1","pages":"293 - 296"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80121056","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10587250108024688
Jiyoung Kim, Y. Oh, E. Son, Jin Un Kim, Burm-Jong Lee
Abstract A ligand exchange of trichloro-2,2′-dipyridylstearylamine ruthenium(III) (Ru(dps)Cl3) monolayer was investigated at the air-water interface and in the LB film. The optical image of the monolayer was monitored by Brewster angle microscopy. When the monolayer was spread on alkaline subphase (pH 11), the surface pressure spontaneously increased up to 15 mN/m. The λmax around 550 nm of UV-Vis absorption spectra of Ru(dps)Cl3 in chloroform was shifted to around 670 nm in the LB film. The FT-IR spectra of the LB films also supported the two-dimensional ligand exchange of chloride to water or hydroxide ions.
{"title":"Monolayer Properties of a Dipyridyl Coordinated Ruthenium Compound","authors":"Jiyoung Kim, Y. Oh, E. Son, Jin Un Kim, Burm-Jong Lee","doi":"10.1080/10587250108024688","DOIUrl":"https://doi.org/10.1080/10587250108024688","url":null,"abstract":"Abstract A ligand exchange of trichloro-2,2′-dipyridylstearylamine ruthenium(III) (Ru(dps)Cl3) monolayer was investigated at the air-water interface and in the LB film. The optical image of the monolayer was monitored by Brewster angle microscopy. When the monolayer was spread on alkaline subphase (pH 11), the surface pressure spontaneously increased up to 15 mN/m. The λmax around 550 nm of UV-Vis absorption spectra of Ru(dps)Cl3 in chloroform was shifted to around 670 nm in the LB film. The FT-IR spectra of the LB films also supported the two-dimensional ligand exchange of chloride to water or hydroxide ions.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"30 1","pages":"63 - 66"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87755325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10587250108030110
K. Okamoto, Tomoaki Tojo, H. Tada, M. Terazima, K. Matsusige
Abstract Microscopic patterning on polysilane thin film was observed after photoexcitation with an optical interference pattern using a nanosecond pulsed laser. The patterning processes were monitored by the diffraction of the probe beam. The observed diffraction signals consist of the transient grating component due to the temperature change and the permanent grating component due to a chemical reaction. It was found that the microscopic pattern was destroyed with prolonged laser radiation. The created microscopic pattern was observed by the optical microscope.
{"title":"Microscopic Patterning on the Polysilane Films by the Laser Induced Grating Technique","authors":"K. Okamoto, Tomoaki Tojo, H. Tada, M. Terazima, K. Matsusige","doi":"10.1080/10587250108030110","DOIUrl":"https://doi.org/10.1080/10587250108030110","url":null,"abstract":"Abstract Microscopic patterning on polysilane thin film was observed after photoexcitation with an optical interference pattern using a nanosecond pulsed laser. The patterning processes were monitored by the diffraction of the probe beam. The observed diffraction signals consist of the transient grating component due to the temperature change and the permanent grating component due to a chemical reaction. It was found that the microscopic pattern was destroyed with prolonged laser radiation. The created microscopic pattern was observed by the optical microscope.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"71 1","pages":"379 - 382"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87215327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10587250108024774
S. Oh, C. Lee, S. W. Kim
Abstract Amorphous molecular materials such as 1,3,5-tris(4-chlorophenyl phenylamino)benzene, p-ClTDAB and p-BrTDAB were synthesized and then organic electroluminescent (EL) devices using the amorphous compounds as hole transporting materials were fabricated. ITO/p-XTDAB (X˭C1 or Br)/Alq3/Al device emitted green light with the brightness of 1300 cd/m2. Especially, it has been found that the durability and EL performance were improved by p-XTDAB compared to TDAB.
{"title":"Durability and Characteristics of Organic EL Device using Amorphous Materials as Hole Transporting Materials","authors":"S. Oh, C. Lee, S. W. Kim","doi":"10.1080/10587250108024774","DOIUrl":"https://doi.org/10.1080/10587250108024774","url":null,"abstract":"Abstract Amorphous molecular materials such as 1,3,5-tris(4-chlorophenyl phenylamino)benzene, p-ClTDAB and p-BrTDAB were synthesized and then organic electroluminescent (EL) devices using the amorphous compounds as hole transporting materials were fabricated. ITO/p-XTDAB (X˭C1 or Br)/Alq3/Al device emitted green light with the brightness of 1300 cd/m2. Especially, it has been found that the durability and EL performance were improved by p-XTDAB compared to TDAB.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"2012 1","pages":"423 - 426"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73431046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10587250108030040
Kuniaki Tanaka, K. Maeda, H. Usui
Abstract SrOx thin films were prepared by the ionization-assisted deposition as the electron injection layer between the electron transport/emitting layer and the Al cathode of the organic light emitting diode. By inserting an SrOx layer of a few-nm thick, the luminance increased nearly three orders of magnitudes for the same driving voltage. The device performance was also controlled by the ion acceleration voltage that was applied in the course of SrOx film deposition. Compared to the simple evaporation, the ionization-assisted deposition improved the luminance and the power efficiency by more than two times. XPS analysis suggested that the ion acceleration leads to two dimensional homogeneous film growth at the initial stage of film deposition.
{"title":"Ionization-Assisted Deposition of SrOx Thin Films for Electron Injection Layer of Organic Light Emitting Diodes","authors":"Kuniaki Tanaka, K. Maeda, H. Usui","doi":"10.1080/10587250108030040","DOIUrl":"https://doi.org/10.1080/10587250108030040","url":null,"abstract":"Abstract SrOx thin films were prepared by the ionization-assisted deposition as the electron injection layer between the electron transport/emitting layer and the Al cathode of the organic light emitting diode. By inserting an SrOx layer of a few-nm thick, the luminance increased nearly three orders of magnitudes for the same driving voltage. The device performance was also controlled by the ion acceleration voltage that was applied in the course of SrOx film deposition. Compared to the simple evaporation, the ionization-assisted deposition improved the luminance and the power efficiency by more than two times. XPS analysis suggested that the ion acceleration leads to two dimensional homogeneous film growth at the initial stage of film deposition.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"16 1","pages":"65 - 68"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74486396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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