Pl and el characteristics of mixture of polyacetylene derivatives and dynamics of excitons

Hidayat, Rahmat; Hirohata, Masaharu; Tatsuhara, Satoshi; Teraguchi, Masahiro; Masuda, Toshio; Yoshino, Katsumi

doi:10.1016/s0379-6779(98)01273-9

Cited by 9 publications

(13 citation statements)

References 7 publications

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“…[10][11][12] In different substituents, although the obtained EL emission wavelength is distributed from 450 to 650 nm, its efficiency and brightness are quite weak (luminance < 1 cd/m 2 ) due to the interchain energy transfer between polymer chains. 13) Polymers prepared herein ( Fig.…”

Section: Resultsmentioning

confidence: 99%

Photoluminescence and Electroluminescence Characteristics of New Disubstituted Polyacetylenes

Ting

Hsu

2001

Jpn. J. Appl. Phys.

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Three di-substituted acetylenes in the tolane structure, 4-(trans-4-pentylcyclohexyl)-3 ,4 -difluorotolane (1M), 4-(trans-4heptylcyclohexyl)-4 -fluorotolane (2M), and 4-(4-pentylphenyl)-4 -fluorotolane (3M), were polymerized in the presence of TaCl 5 -based catalyst. The weight-average molecular weights Mw of the polymers were high than 4 × 10 5 . Photoluminescence (PL) and electroluminescence (EL) of the three polymers made as single-layer device on indium-tin oxide glass (ITO), ITO/polymer/Al, have been comprehensively studied. By changing the structural conditions of polymer, such as introducing the fluorine atom or a long carbon chain to the end group of polymer side chains, the luminescence is clearly enhanced.

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Section: Resultsmentioning

confidence: 99%

Photoluminescence and Electroluminescence Characteristics of New Disubstituted Polyacetylenes

Ting

Hsu

2001

Jpn. J. Appl. Phys.

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“…3he 2 (10) in which m e is the mass of an electron, is Planck's reduced constant, v ij is the resonant frequency, e is the charge of the electron and → D ij is the electric dipole moment matrix element for the transition between the initial state i and the final state j.…”

Section: Ground-state Dftmentioning

confidence: 99%

“…They experimentally proved that intensity of PL and the spectrum were dependent on the PA and various electrode configurations [9]. Hidayat et al studied the PL and EL of the mixtures of PA and found a remarkable spectral shift in PL and EL [10]. Franco et al [11] studied the computational examination of trans-polyacetylene oligomers, which was based on the electron vibrational dynamics of molecular systems.…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence of Cis-Polyacetylene Semiconductor Material

et al. 2022

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Photoluminescence (PL) is one of the key experimental characterizations of optoelectronic materials, including conjugated polymers (CPs). In this study, a simplified model of an undoped cis-polyacetylene (cis-PA) oligomer was selected and used to explain the mechanism of photoluminescence (PL) of the CPs. Using a combination of the ab initio electronic structure and a time-dependent density matrix methodology, the photo-induced time-dependent excited state dynamics were computed. We explored the phonon-induced relaxation of the photoexcited state for a single oligomer of cis-PA. Here, the dissipative Redfield equation of the motion was used to compute the dissipative excited state dynamics of electronic degrees of freedom. This equation used the nonadiabatic couplings as parameters. The computed excited state dynamics showed that the relaxation rate of the electron is faster than the relaxation rate of the hole. The dissipative excited-state dynamics were combined with radiative recombination channels to predict the PL spectrum. The simulated results showed that the absorption and emission spectra both have a similar transition. The main result is that the computed PL spectrum demonstrates two mechanisms of light emission originating from (i) the inter-band transitions, corresponding to the same range of transition energies as the absorption spectrum and (ii) intra-band transitions not available in the absorption spectra. However, the dissipative Redfield equation of the motion was used to compute the electronic degrees of freedom of the nonadiabatic couplings, which helped to process the time propagation of the excited dynamic state. This excited dynamic state shows that the relaxation rate of the electron is faster than the relaxation rate of the hole, which can be used for improving organic semiconductor materials for photovoltaic and LED applications.

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“…Polyacetylenes derived from monosubstituted alkynes present in general very weak luminescence 2, 61–63. However, fluorescent polyacetylenes have been obtained by attaching fluorophores such are carbazole,64–68 fluorene,61, 69 4‐ethynylphenyl,70 bi‐ or terphenyl,71, 72 antryl,73–75 phenantryl,74 pyrenyl76 or silole77 to the side chains.…”

Section: Introductionmentioning

confidence: 99%

“…Some of these polymers present electroluminescence 64, 70. In contrast, poly(disubstituted alkyne)s present stronger fluoro‐ and electroluminescence than those derived from monosubstituted alkynes 1, 2, 13, 61, 63, 78–89. Unfortunately, the polymerization of disubstituted alkynes is limited to alkynes containing functional groups which are compatible with the highly reactive early‐transition metal catalysts used 3, 90, 91…”

Section: Introductionmentioning

confidence: 99%

Synthesis and luminescence of poly(phenylacetylene)s with pendant iridium complexes and carbazole groups

Vicente¹,

Gil‐Rubio²,

Zhou³

et al. 2010

J. Polym. Sci. A Polym. Chem.

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Poly(phenylacetylene)s containing pendant phosphorescent iridium complexes have been synthesized and their electrochemical, photo-and electroluminescent properties studied. The polymers have been synthesized by rhodium-catalyzed copolymerization of 9-(4-ethynylphenyl)carbazole (CzPA) and phenylacetylenes (C^N) 2 Ir(j). In addition, organic poly(phenylacetylene)s with pendant carbazole groups have been synthesized by rhodium-catalyzed copolymerization of CzPA and 1-ethynyl-4-pentylbenzene. Complex (C^N) 2 Ir(j 2 -O,O 0 -MeC(O)CHC(O)Ph) (Ir piq Ph; C^N ¼ 2-(isoquinolin-1-yl)phenyl-j 2 -N,C 1 ) was prepared and characterized. While the copolymers of the Ir ppy series were weakly phosphorescent, those of the Ir piq series displayed at room temperature intense emissions from the carbazole (fluorescence) and iridium (phosphorescence) emitters, being the latter dominant when the spectra were recorded using polymer films. Triple layer OLED devices employing copolymers of the Ir piq series or the model complex Ir piq Ph yielded electroluminescence with an emission spectra originating from the iridium complex and maximum external quantum efficiencies of 0.46% and 2.99%, respectively.

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Pl and el characteristics of mixture of polyacetylene derivatives and dynamics of excitons

Cited by 9 publications

References 7 publications

Photoluminescence and Electroluminescence Characteristics of New Disubstituted Polyacetylenes

Photoluminescence and Electroluminescence Characteristics of New Disubstituted Polyacetylenes

Photoluminescence of Cis-Polyacetylene Semiconductor Material

Synthesis and luminescence of poly(phenylacetylene)s with pendant iridium complexes and carbazole groups

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