Noneontact temperature measurements of organic layers in an organic light-emitting diode using wavenumber-temperature relations of raman bands

Takuro Sugiyama, Yukio Furukawa

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

We have measured the temperatures of the organic layers in operating organic light-emitting diodes (OLEDs) by Raman spectroscopy. The wavenumbers of the Raman bands due to N, N′-di-naphthaley1-1, 1′-bipheny1-4, 4′-diamine (NPD) and copper phthalocyanine (CuPc) have been measured as a function of temperature in the range of 25-191 °C. The observed positions of strong bands around 1607 cm-1 (NPD) and 1531 cm-1 (CuPc) shifted downward linearly with increasing temperature in the ranges lower than 92 and 191 °C, respectively. We have determined the temperatures of the NPD and CuPc layers in an operating OLED from the wavenumber-temperature relations of these bands.

Original languageEnglish
Pages (from-to)3537-3539
Number of pages3
JournalJapanese journal of applied physics
Volume47
Issue number5 PART 1
DOIs
Publication statusPublished - 2008 May 16

Keywords

  • Copper phthalocyanine
  • NPD
  • OLED
  • Raman spectroscopy
  • Temperature
  • Wavenumber

ASJC Scopus subject areas

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

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