成果報告書詳細
管理番号20120000000782
タイトル*平成23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2012/7/5
報告書年度2011 - 2011
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
和文要約和文要約等以下本編抜粋:
(1)基本計画に対する進捗状況
基本計画に記載の平成25 年度目標を鑑みて設定した、当グループの本年度目標を下表に記す。
英文要約Fundamental Technology Development of Next-generation High-efficiency and High-quality Lighting/Development of high efficiency white OLEDs for lighting (FY2011-FY2012) FY2011 Annual Report
1. Development of high efficiency white OLEDs for lighting
1-1. White OLEDs and materials
Host materials and electron transport materials for phosphorescent blue OLED devices were developed, and some materials that achieved better performance such as lower driving voltage and/or longer lifetime in blue phosphorescent devices were chosen to evaluate in white devices. Two-unit all phosphorescent white OLEDs composed of the red/blue and red/green phosphorescent units were investigated in order to achieve high CRI white emission as well as to improve the lifetime. The interfacial injection barriers around the blue phosphorescent emissive layer and transport properties of some layers were examined in order to reduce the driving voltage in red/blue emissive unit with various materials mentioned above. A highly reflective cathode and more transparent materials for some layers were applied to improve the light outcoupling efficiency. This device was fabricated on the light outcoupling substrate (already developed in this project in 2010) and optical structure of the device was re-optimized for the light outcoupling substrate. As a consequence, a white OLED panel (25 cm2) with luminous efficacy of 87.3 lm/W, CRI of 82 and color coordinates of (0.46, 0.42) (color temperature: 2,800 K 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 obtained. Estimated half-decay lifetime from the initial luminance of 1,000 cd/m2 was over 100,000 h.
1-2. Important related technologies
1-2-1. Phosphorescent blue devices for white OLEDs
Optical and electrical evaluation with various carrier transport materials and host materials in the blue phosphorescent devices was conducted. Specific combination of these materials and device structure achieved quite high light outcoupling efficiency of over 30 % even with a standard glass substrate (without any light outcoupling structure).
1-2-2. Light outcoupling technology
Emission pattern from the emissive layer was optimized by various optical parameters of thin layers of, for example, refractive index, extinction coefficient and thickness in order to improve the light outcoupling efficiency by the reduction of total internal reflection and light extinction. Additionally, low resistance and highly transparent thick carrier transport layers were investigated in order to reduce the plasmon loss. Thus, light outcoupling efficiency in monochrome OLED device achieved 47 %.
1-2-3. Low-n transparent electrode
Reactive sputtering and off-axis DC sputtering methods of aluminum zinc oxide as a non-indium transparent electrode was investigated. Even at low substrate temperature (130 to 200 oC), resistivity of about 6 x 10-4 ohm cm and high transparency of over 80 % at the thickness of 300 nm was achieved.
2. Development of high throughput production technologies for OLED lighting
2-1. Materials and processes for printable electrode
Printable non-indium electrode materials and coating processes were developed. Optical and electrical properties as well as surface smoothness of the printable electrode were improved by the introduction of the additional layer onto the electrode layer for the control of electrode surface properties. White OLED fabricated on this electrode showed similar performance to the same device on ITO electrode. Pattern coating and drying processes especially for the dual-layered electrode mentioned above were minutely evaluated. Consequently, patterned coating speed of 20 mm/s and position accuracy of +/- 0.5 mm were achieved. Additionally, OLED device with this electrode (25 cm2) was fabricated and stable operation was confirmed.
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