{"title":"Highly efficient and stable blue fluorescent OLED using dual EML system","authors":"Satomi Tasaki, Masato Nakamura, Yu Kudo, Keitaro Yamada, Kazuki Terada, Tsukasa Sawato, Tomonori Nakamura, Kazuki Nishimura, Emiko Kambe","doi":"10.1002/jsid.2073","DOIUrl":null,"url":null,"abstract":"<p>In 2022, we presented a high-efficiency improvement for blue fluorescent OLEDs through Dual emitting layer (BH1/BH2 EML) technology to enhance performance. In this study, the light extraction efficiency was improved by controlling the molecular orientation and the spectral shape of the blue dopant (BD) in the blue host (BH) on the anode side. Additionally, through mechanism analysis, we confirmed that the clear functional separation of the two layers enhanced the Triplet-Triplet Fusion (TTF) efficiency and each BHs deuteration impact resulting in a multiplicative extension of lifetime. Furthermore, by applying a dual-hole transporting layer (HTL) that contributes to light extraction improvement, the bottom-emission (BE) device achieved external quantum efficiency (EQE) = 16.3%, and top-emission (TE) device reached BI = 350, LT95@50 mA/cm<sup>2</sup> > 200 h.</p>","PeriodicalId":49979,"journal":{"name":"Journal of the Society for Information Display","volume":"33 5","pages":"502-512"},"PeriodicalIF":2.2000,"publicationDate":"2025-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of the Society for Information Display","FirstCategoryId":"5","ListUrlMain":"https://sid.onlinelibrary.wiley.com/doi/10.1002/jsid.2073","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
引用次数: 0
Abstract
In 2022, we presented a high-efficiency improvement for blue fluorescent OLEDs through Dual emitting layer (BH1/BH2 EML) technology to enhance performance. In this study, the light extraction efficiency was improved by controlling the molecular orientation and the spectral shape of the blue dopant (BD) in the blue host (BH) on the anode side. Additionally, through mechanism analysis, we confirmed that the clear functional separation of the two layers enhanced the Triplet-Triplet Fusion (TTF) efficiency and each BHs deuteration impact resulting in a multiplicative extension of lifetime. Furthermore, by applying a dual-hole transporting layer (HTL) that contributes to light extraction improvement, the bottom-emission (BE) device achieved external quantum efficiency (EQE) = 16.3%, and top-emission (TE) device reached BI = 350, LT95@50 mA/cm2 > 200 h.
期刊介绍：
The Journal of the Society for Information Display publishes original works dealing with the theory and practice of information display. Coverage includes materials, devices and systems; the underlying chemistry, physics, physiology and psychology; measurement techniques, manufacturing technologies; and all aspects of the interaction between equipment and its users. Review articles are also published in all of these areas. Occasional special issues or sections consist of collections of papers on specific topical areas or collections of full length papers based in part on oral or poster presentations given at SID sponsored conferences.
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