Highly efficient single‐unit white OLED device with emission from both singlet and triplet excitons. Issue 8 (19th March 2015)

• Record Type: Journal Article
• Authors: Ishisone, Takahiro; Seo, Satoshi; Nonaka, Yusuke; Kawata, Takuya; Ohsawa, Nobuharu
• Is Part Of: Journal of the Society for Information Display. Volume 22:Issue 8(2014:Aug.)
• Page Start: 404
• Page End: 411
• Publication Date: 2015-03-19
• Subjects: OLED -- Exciplex‐triplet energy transfer (ExTET) -- TTA -- lighting application -- White OLED; Information display systems -- Periodicals; 621.38154205
• DOI: 10.1002/jsid.260
• Languages: English
• ISSNs: 1071-0922

Abstract

Abstract: We succeeded in developing a single‐unit hybrid organic light‐emitting diode (OLED) device with efficient light emission from both a phosphorescent layer and a fluorescent layer. The single‐unit hybrid OLED achieved a power efficiency higher than that of a two‐unit hybrid tandem OLED with phosphorescent and fluorescent layers. Abstract : We have developed a novel single‐unit hybrid organic light‐emitting diode device in which exciplex‐triplet energy transfer is applied to a phosphorescent layer and triplet‐triplet annihilation is applied to a fluorescent layer. This device achieved an excellent color rendering index of 87 and high‐power efficiency of 84 lm/W at 1000 cd/m2. In addition, the lifetime (LT70 ) of the device was estimated to be 180 000 h at 1000 cd/m2, which is enough for lighting applications.