Negative giant surface potential of vacuum-evaporated tris(7-propyl-8- hydroxyquinolinolato) aluminum(III) [Al(7-Prq)3] film

Takashi Isoshima, Youichi Okabayashi, Eisuke Ito, Masahiko Hara, Whee Won Chin, Jin Wook Han

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Negative giant surface potential was realized in a vacuum-evaporated film of tris(7-propyl-8-hydroxyquinolinolato) aluminum(III) [Al(7-Prq)3]. Electroabsorption response of the film presented an inverted polarity to that of tris(8-hydroxyquinolinolato) aluminum (Alq3), suggesting opposite noncentrosymmetry of molecular orientation. Asymmetric dice model with molecular geometric effect has been proposed, and propyl substitution at 7 position of the ligands was indicated to affects the molecular posture on the surface to invert the polarity of noncentrosymmetry. Our results opened a new possibility of controlling molecular orientation in a film for device applications.

Original languageEnglish
Pages (from-to)1988-1991
Number of pages4
JournalOrganic Electronics
Volume14
Issue number8
DOIs
StatePublished - 2013 Jan 1

Fingerprint

Surface potential
Aluminum
Molecular orientation
Vacuum
aluminum
vacuum
polarity
posture
Substitution reactions
Ligands
substitutes
ligands

Keywords

  • 1st-Order electroabsorption spectroscopy
  • Giant surface potential
  • Kelvin probe
  • Spontaneous polar molecular orientation
  • Vacuum evaporation

Cite this

Isoshima, Takashi ; Okabayashi, Youichi ; Ito, Eisuke ; Hara, Masahiko ; Chin, Whee Won ; Han, Jin Wook. / Negative giant surface potential of vacuum-evaporated tris(7-propyl-8- hydroxyquinolinolato) aluminum(III) [Al(7-Prq)3] film. In: Organic Electronics. 2013 ; Vol. 14, No. 8. pp. 1988-1991.
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abstract = "Negative giant surface potential was realized in a vacuum-evaporated film of tris(7-propyl-8-hydroxyquinolinolato) aluminum(III) [Al(7-Prq)3]. Electroabsorption response of the film presented an inverted polarity to that of tris(8-hydroxyquinolinolato) aluminum (Alq3), suggesting opposite noncentrosymmetry of molecular orientation. Asymmetric dice model with molecular geometric effect has been proposed, and propyl substitution at 7 position of the ligands was indicated to affects the molecular posture on the surface to invert the polarity of noncentrosymmetry. Our results opened a new possibility of controlling molecular orientation in a film for device applications.",
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Negative giant surface potential of vacuum-evaporated tris(7-propyl-8- hydroxyquinolinolato) aluminum(III) [Al(7-Prq)3] film. / Isoshima, Takashi; Okabayashi, Youichi; Ito, Eisuke; Hara, Masahiko; Chin, Whee Won; Han, Jin Wook.

In: Organic Electronics, Vol. 14, No. 8, 01.01.2013, p. 1988-1991.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Negative giant surface potential of vacuum-evaporated tris(7-propyl-8- hydroxyquinolinolato) aluminum(III) [Al(7-Prq)3] film

AU - Isoshima, Takashi

AU - Okabayashi, Youichi

AU - Ito, Eisuke

AU - Hara, Masahiko

AU - Chin, Whee Won

AU - Han, Jin Wook

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AB - Negative giant surface potential was realized in a vacuum-evaporated film of tris(7-propyl-8-hydroxyquinolinolato) aluminum(III) [Al(7-Prq)3]. Electroabsorption response of the film presented an inverted polarity to that of tris(8-hydroxyquinolinolato) aluminum (Alq3), suggesting opposite noncentrosymmetry of molecular orientation. Asymmetric dice model with molecular geometric effect has been proposed, and propyl substitution at 7 position of the ligands was indicated to affects the molecular posture on the surface to invert the polarity of noncentrosymmetry. Our results opened a new possibility of controlling molecular orientation in a film for device applications.

KW - 1st-Order electroabsorption spectroscopy

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KW - Kelvin probe

KW - Spontaneous polar molecular orientation

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