Organic EL device using SrO<sub><i>x</i></sub> as an electron injection material

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公開日
2003-06-16
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  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/ecjb.1126
公開者
Wiley

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<jats:title>Abstract</jats:title><jats:p>Strontium oxide (SrO<jats:sub><jats:italic>x</jats:italic></jats:sub>) is known as an alkaline‐earth metal oxide that has a low work function. We have prepared an organic EL device with an ITO/PVCz (polyvinylcarbazole)/Alq/SrO<jats:sub><jats:italic>x</jats:italic></jats:sub>/Al structure. SrO<jats:sub><jats:italic>x</jats:italic></jats:sub> was stacked as an electron injection layer on the Alq (aluminum quinolinol complex) emission layer by means of a reactive vapor deposition method by evaporating metallic strontium under an oxygen atmosphere. By inserting the SrO<jats:sub><jats:italic>x</jats:italic></jats:sub> film of less than 5 nm in thickness, significant improvements were achieved in the device properties, including luminance, lifetime, threshold voltage, and efficiency. XPS measurement and AFM analysis showed that the film morphology of the SrO<jats:sub><jats:italic>x</jats:italic></jats:sub> layer had an island structure. The oxidation of SrO<jats:sub><jats:italic>x</jats:italic></jats:sub> was enhanced by setting the oxygen partial pressure for the reactive vapor deposition to 10<jats:sup>−3</jats:sup> to 10<jats:sup>−2</jats:sup> Pa, which yielded the optimum EL properties. © 2003 Wiley Periodicals, Inc. Electron Comm Jpn Pt 2, 86(7): 73–80, 2003; Published online in Wiley InterScience (<jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.interscience.wiley.com">www.interscience.wiley.com</jats:ext-link>). DOI 10.1002/ecjb.1126</jats:p>

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