成果報告書詳細
管理番号20130000000826
タイトル*平成24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2013/10/22
報告書年度2012 - 2012
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 establishment of standard evaluation cells and evaluation basis for the purpose of ensuring lifetime and performance of organic electronic devices.
For the “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) have been developed. The facilities for the evaluation of device performance have been introduced and installed. By using the reference cells, initial cell performance and lifetime evaluation under constant-current driving were performed. In addition to the evaluation for glass substrate-based cells, the development concerning the technologies related with flexible film-based cells has been started.
Major technological issues in cell fabrication processes (cleaning and drying processes of substrate, surface treatment of substrate, fabrication process, encapsulation process, control of fabrication environment and so on) have been extracted and examined. The correlations between the ranges of variations of cell performance and the extracted major issues were examined.
Facilities for film substrate-based cell fabrication and its in-line performance evaluation have been introduced and installed. Facilities for solution-coating processes on film substrate were introduced and installed. For the first step, major technological issues in cell fabrication processes on film-based substrate have been 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. White OLED cells with so-called multi-photon type cells were fabricated and their performance was evaluated.
For the purpose of the establishment of quantitative evaluation technologies for analyses of OLEDs, impedance spectroscopic technology, surface-plasmon resonance technology, and nonlinear optical sum-frequency generation spectroscopy have been developed. As for the impedance spectroscopy, the key strategies for the analysis of
OLEDs with mulitilayer structures were discussed. Using the nonlinear optical sum-frequency generation spectroscopy, vibrational spectra from component organic layers within the cells at steady-state cell operation conditions were obtained and the obtained spectra were used for the detections of degraded components within the cells.
A join work by Kyushu group and CEREBA have been performed. Thermally stimulated current (TSC) analysis method, which is useful for the evaluation of carrier traps within OLED cells, has been developed. The changes of trap sites within carrier transport layers due to continuous current driving were successfully detected.
Key issues for the sensitivity improvements in two evaluation techniques for the gas barrier characteristics, API-Mass spectroscopy method and calcium-degradation method have been extracted. Numerical simulations on water vapor permeation process about model barrier films were found to be useful for the extractions of the technical issues related with the evaluation of the gas barrier characteristics.
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