成果報告書詳細
管理番号20130000000468
タイトル*平成24年度中間年報 次世代高効率・高品質照明の基盤技術開発 有機EL照明の高効率・高品質化に係る基盤技術開発(1)
公開日2013/10/1
報告書年度2012 - 2012
委託先名パナソニック株式会社 出光興産株式会社 タツモ株式会社 長州産業株式会社 国立大学法人山形大学 青山学院大学
プロジェクト番号P09024
部署名電子・材料・ナノテクノロジー部
和文要約
英文要約itle: Fundamental Technology Development of Next OLED Lighting of High-efficiency and High-quality

1. White OLED device
A White OLED panel (emissive area: 25 cm2) with luminous efficacy of 110 lm/W, CRI of 81 at the color coordinates of (0.48, 0.42), that was within the quadrangle determined in "ENERGY STAR Program Requirements for Solid State Lighting Luminaires, Eligibility Criteria, at the luminance of 1,000 cd/m2 was realized. Estimated half-decay lifetime from the initial luminance of 1,000 cd/m2 was over 120,000 h.

2. High performance materials
Host materials and electron transport materials for phosphorescent blue OLED devices were developed. Triplet energy and singlet energy of those materials were estimated by quantum chemical calculation, and a lot of organic materials were synthesized and purified. A host material that showed the reduced driving voltage and good lifetime, and an electron transport material that achieved the stable driving voltage during operation were developed and applied to the white OLED.

3. Light outcoupling technology
In our light outcoupling substrate (already developed in this project in 2010), light absorption by some layers (such as a transparent electrode and some organic layers) was reduced. Furthermore, the optical structure of the white OLED was optimized in order to reduce light extinction at around the reflective electrode. An optimized white OLED achieved the estimated light outcoupling efficiency of over 50 %.

4. Wet coatable transparent electrode
Highly transparent non-indium electrode with low resistivity was fabricated on an adequately treated glass substrate with a functional layer onto the electrode. De-gas treatment of the electrode improved the lifetime of OLED, and a white OLED fabricated on the electrode showed similar performance to the device on ITO electrode. Pattern coating and drying processes were developed in order to improve the pattern accuracy and the productivity, and these process achieved the coating speed of 40 mm/s , pattern accuracy of +/- 0.5 mm and thickness uniformity of +/- 10 %.

5. High rate deposition process
In order to reduce the thermal degradation of organic materials, a lamp assist deposition source was developed and evaporation rate of 10 g/h with accurate deposition rate control was achieved. Additionally, continuous evaporation for over 144 h at determined evaporation rate was experimentally confirmed.
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