Effect of alkoxy substitution on photophysical properties of poly(p-phenylenevinylene)

Geon Joon Lee, Dongho Kim, Jeong Ik Lee, Hong Ku Shim, Yong Wan Kim, Jae Cheol Jo

Research output: Contribution to journalArticle

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Abstract

The effect of alkoxy substitution on the photophysioal properties of poly(p-phenylenevinylene) [PPV] was investigated using steady-state and time-resolved photoluminescence, visible and infrared absorption spectroscopies. By substituting the alkoxy group (methoxy or butoxy) into the phenylene ring of PPV, the prolongation of effective conjugation length accompanied by the disappearance of the well-resolved vibronic structure was detected in the absorption spectra. These experimental results were attributable to the electron donating effect and the steric hindrance of the alkoxy substituent. These conjectures were compared with the effect of the alkoxy substitution on the photoluminescence and the Fourier-transform infrared spectra. Also, it was found that, alkoxy substitution slowed down the exciton relaxation process from the lower exciton state to the ground state, and lowered the height of the potential barrier in an excitonic potential well.

Original languageEnglish
Pages (from-to)114-119
Number of pages6
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume35
Issue number1 A
DOIs
Publication statusPublished - 1996 Jan 1

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Substitution reactions
substitutes
Excitons
Photoluminescence
excitons
photoluminescence
prolongation
Infrared absorption
Relaxation processes
conjugation
Absorption spectroscopy
Ground state
infrared absorption
Absorption spectra
Infrared spectroscopy
Fourier transforms
absorption spectroscopy
infrared spectra
infrared spectroscopy
Infrared radiation

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

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abstract = "The effect of alkoxy substitution on the photophysioal properties of poly(p-phenylenevinylene) [PPV] was investigated using steady-state and time-resolved photoluminescence, visible and infrared absorption spectroscopies. By substituting the alkoxy group (methoxy or butoxy) into the phenylene ring of PPV, the prolongation of effective conjugation length accompanied by the disappearance of the well-resolved vibronic structure was detected in the absorption spectra. These experimental results were attributable to the electron donating effect and the steric hindrance of the alkoxy substituent. These conjectures were compared with the effect of the alkoxy substitution on the photoluminescence and the Fourier-transform infrared spectra. Also, it was found that, alkoxy substitution slowed down the exciton relaxation process from the lower exciton state to the ground state, and lowered the height of the potential barrier in an excitonic potential well.",
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Effect of alkoxy substitution on photophysical properties of poly(p-phenylenevinylene). / Lee, Geon Joon; Kim, Dongho; Lee, Jeong Ik; Shim, Hong Ku; Kim, Yong Wan; Jo, Jae Cheol.

In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, Vol. 35, No. 1 A, 01.01.1996, p. 114-119.

Research output: Contribution to journalArticle

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AU - Lee, Geon Joon

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AU - Jo, Jae Cheol

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AB - The effect of alkoxy substitution on the photophysioal properties of poly(p-phenylenevinylene) [PPV] was investigated using steady-state and time-resolved photoluminescence, visible and infrared absorption spectroscopies. By substituting the alkoxy group (methoxy or butoxy) into the phenylene ring of PPV, the prolongation of effective conjugation length accompanied by the disappearance of the well-resolved vibronic structure was detected in the absorption spectra. These experimental results were attributable to the electron donating effect and the steric hindrance of the alkoxy substituent. These conjectures were compared with the effect of the alkoxy substitution on the photoluminescence and the Fourier-transform infrared spectra. Also, it was found that, alkoxy substitution slowed down the exciton relaxation process from the lower exciton state to the ground state, and lowered the height of the potential barrier in an excitonic potential well.

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