Horizontal molecular orientation of light-emitting oligofluorenes in spin-coated glassy organic thin films

Li Zhao, Takeshi Komino, Dae Hyeon Kim, Muhammad Hasnan Sazzad, Delphine Pitrat, Jean Christophe Mulatier, Chantal Andraud, Jean Charles Maurice Ribierre, Chihaya Adachi

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Horizontal orientation of light-emitting chromophores plays a critical role in the light outcoupling efficiency and the overall performances of organic light-emitting diodes. Here, we demonstrate that such a horizontal orientation of light-emitting molecules can be achieved in solution-processed blends containing highly fluorescent oligofluorenes dispersed into various small molecule host materials. The influences of the host material, the solvent used for the spin-coating, the doping concentration of the oligofluorenes and the oligofluorene chemical structure on these orientational processes are investigated using variable angle spectroscopic ellipsometry and angle-dependent photoluminescence measurements. By clarifying the roles played by these parameters in the horizontal orientation of the emitters, the results provide crucial insights into these molecular orientational processes in spin-coated glassy organic thin films, which should be relevant for the development of high-efficiency solution-processed organic light-emitting diodes in the near future.

Original languageEnglish
Pages (from-to)11557-11565
Number of pages9
JournalJournal of Materials Chemistry C
Volume4
Issue number48
DOIs
Publication statusPublished - Jan 1 2016

Fingerprint

Molecular orientation
Organic light emitting diodes (OLED)
Thin films
Molecules
Spectroscopic ellipsometry
Spin coating
Chromophores
Photoluminescence
Doping (additives)

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

Cite this

Horizontal molecular orientation of light-emitting oligofluorenes in spin-coated glassy organic thin films. / Zhao, Li; Komino, Takeshi; Kim, Dae Hyeon; Sazzad, Muhammad Hasnan; Pitrat, Delphine; Mulatier, Jean Christophe; Andraud, Chantal; Ribierre, Jean Charles Maurice; Adachi, Chihaya.

In: Journal of Materials Chemistry C, Vol. 4, No. 48, 01.01.2016, p. 11557-11565.

Research output: Contribution to journalArticle

Zhao, L, Komino, T, Kim, DH, Sazzad, MH, Pitrat, D, Mulatier, JC, Andraud, C, Ribierre, JCM & Adachi, C 2016, 'Horizontal molecular orientation of light-emitting oligofluorenes in spin-coated glassy organic thin films', Journal of Materials Chemistry C, vol. 4, no. 48, pp. 11557-11565. https://doi.org/10.1039/c6tc02861f
Zhao, Li ; Komino, Takeshi ; Kim, Dae Hyeon ; Sazzad, Muhammad Hasnan ; Pitrat, Delphine ; Mulatier, Jean Christophe ; Andraud, Chantal ; Ribierre, Jean Charles Maurice ; Adachi, Chihaya. / Horizontal molecular orientation of light-emitting oligofluorenes in spin-coated glassy organic thin films. In: Journal of Materials Chemistry C. 2016 ; Vol. 4, No. 48. pp. 11557-11565.
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