成果報告書詳細
管理番号20140000000759
タイトル*平成25年度中間年報 次世代材料評価基盤技術開発 (1)有機EL材料の評価基盤技術開発
公開日2015/1/31
報告書年度2013 - 2013
委託先名次世代化学材料評価技術研究組合
プロジェクト番号P10029
部署名電子・材料・ナノテクノロジー部
和文要約
英文要約The major target of the project is the establishment of standard evaluation cells and evaluation basis for the purpose of ensuring lifetime and performance of organic electronic devices.
Using the glass substrate-based reference OLED cells, which are used for the standard evaluation technology: a monocolor green OLED (A2 cell) and multi-photon emission type white OLED cells (B1 cells), development of evaluation technologies on following subjects has been performed: Evaluations of total emission power from OLED cells based on both the measurements of spatial distribution of emitted intensity and the measurements of using an integrating sphere, estimation methods of lifetime of OLEDs, and analysis technologies for device degradation mechanism. In addition to the development based on small 2 mm-size devices, the development on 30 mm-size devices were also tried. The development concerning the technologies related with flexible film-based cells has been performed. The film substrate-based reference cells were fabricated based on separate sheet-based processes and evaluation technologies for cells and component materials specific to film substrate-based cells were developed.
The development of processing technologies of reference cell fabrications for both glass substrate-based and film substrate-based cells were performed. For the processing technologies on glass substrate-based cells, examinations of detailed factors, such as surface treatment conditions of transparent ITO substrate and the use of different vacuum chambers, for reducing fluctuations of device performances were done. For the processing technologies on film-based cells, development of roll-to-roll film-based processes were developed, and the issues related with both vacuum-deposition and solution processes for reducing performance fluctuations were extracted.
Assuming the situations of OLED cells installed in commercial products, specifically illumination applications, the development of evaluation methods for device performance and lifetime has been performed as a joint work by Yamagata University and CEREBA Research Base. The reference white OLED cells with so-called multi-photon type cells were fabricated and evaluation technologies specific white OLEDs were developed.
For the purpose of the establishment of analytic technologies for device degradation of OLEDs, impedance spectroscopic technology and nonlinear optical sum-frequency generation spectroscopy have been developed. As for the impedance spectroscopy, direct evaluation of carrier mobilities of OLEDs with mulitilayer structures were developed. Using the nonlinear optical sum-frequency generation spectroscopy, signals due to the degradation of component materials during continuous device driving were detected. A joint work by Kyushu group and CEREBA have been performed, and the usefulness of thermally stimulated current (TSC) analysis method were shown by detecting the changes of trap sites for holes and electrons within component layers.
For the high-sensitivity evaluation of water barrier capability, three evaluation techniques for the gas barrier characteristics, API-MS, CRDS, and DELTAPERM, have been developed, and coincidence of the evaluated results by three different methods were shown. The evaluation method on 10-4 g/m2/day level barrier capability were thus established.
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