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)


    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
    Issue number5 PART 1
    Publication statusPublished - 2008 May 16



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

    ASJC Scopus subject areas

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

    Cite this