High‐performance white OLEDs with high color‐rendering index for next‐generation solid‐state lighting |
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Authors: | Takuya Komoda Nobuhiro Ide Kittichungchit Varutt Kazuyuki Yamae Hiroya Tsuji Yuko Matsuhisa |
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Affiliation: | Panasonic Electric Works Co., Ltd., Advanced Technologies Development Laboratory, 1048 Kadoma, Osaka, 571‐8686 Japan. |
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Abstract: | Abstract— Several white‐OLED structures with a high color‐rendering index (CRI) were investigated for lighting applications. A two‐unit fluorescent/phosphorescent hybrid white OLED achieved an excellent CRI of 95, high luminous efficacy of 37 lm/W, and long lifetime of over 40,000 hours at 1000 cd/m2. White‐OLED lighting panels of 8 × 8 cm for high‐luminance operation were fabricated, and a stable emission at 3000 cd/m2 was confirmed. Quite a small variation in chromaticity in a different directions was achieved by using an optimized optical device structure. With a light‐outcoupling substrate, a higher efficacy of 56 lm/W, high CRI of 91, and longer half‐decay lifetime of over 150,000 hours at 1000 cd/m2 was achieved. All‐phosphorescent white OLEDs placed on the light‐outcoupling substrate show a high CRI of 85 and higher efficacy of 65 lm/W with a fairly good half‐decay lifetime of over 30,000 hours. With a further voltage reduction and a high‐index spherical extractor, 128 lm/W at 1000 cd/m2 has been achieved. |
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Keywords: | OLED solid‐state lighting color‐rendering index phosphorescent multi‐unit OLED |
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