2025-07-24 東京科学大学
図1．乾電池（1.5 V）1本で白色有機ELを光らせている写真
＜関連情報＞
- https://www.isct.ac.jp/ja/news/sm5m7owsal4m
- https://www.isct.ac.jp/plugins/cms/component_download_file.php?type=2&pageId=&contentsId=1&contentsDataId=1978&prevId=&key=de54917179bf9325b59634b8d581df72.pdf
- https://pubs.rsc.org/en/content/articlelanding/2025/tc/d5tc02150b
1.5 Vの極めて低い点灯電圧を有する白色有機発光ダイオード White organic light-emitting diodes with extremely low turn-on voltage at 1.5 V
Yang Yiyan,Qing-Jun Shui, Hiroto Iwasaki,Daiki Nakahigashi,Yutaka Majima,Ken-ichi Nakayama,Naoya Aizawa and Seiichiro Izawa
Journal of Materials Chemistry C Published:24 Jul 2025
DOI:https://doi.org/10.1039/D5TC02150B
Abstract
Reducing the applied voltage of white organic light-emitting diodes (OLEDs) is crucial for lowering power consumption in commercial displays. However, achieving white emission at low voltages remains a significant challenge, with turn-on voltages typically exceeding 2.5 V. In this study, we report a white OLED with an exceptionally low turn-on voltage of less than 1.5 V. We utilized a triplet–triplet annihilation (TTA) upconversion (UC) process that can produce high-energy blue emission at a small-applied voltage. White-color emission was achieved by incorporating sky-blue and yellow dopants into a blue UC-OLED to control the white color by energy transfer rates from the TTA host to the two dopants. Finally, we demonstrated the white UC-OLED that could be operated by a single 1.5 V battery.
