Human-interactive displays (HIDs) facilitate the visualization of sensible information such as touch, smell, and sound and have attracted significant interest owing to their potential in emerging IoT-connected wearable electronics. Furthermore, the visualization of phenomena that is rarely sensible, such as magnetic fields, ultrasonic waves, and odorless toxic gases or liquids, can further broaden the utilization of HIDs. Field-induced electroluminescence (EL) of either organic or inorganic fluorescent materials under alternating current (AC) has been extensively studied and its unique device architecture in which an emitting layer is separated with an insulator from electrode offers a new platform for designing and developing emerging HIDs. Here, we present various sensory and extra-sensory interactive displays based on AC EL.
{"title":"Sensory and extra-sensory interactive displays with field-induced electroluminescence","authors":"Cheolmin Park","doi":"10.1117/12.2594053","DOIUrl":"https://doi.org/10.1117/12.2594053","url":null,"abstract":"Human-interactive displays (HIDs) facilitate the visualization of sensible information such as touch, smell, and sound and have attracted significant interest owing to their potential in emerging IoT-connected wearable electronics. Furthermore, the visualization of phenomena that is rarely sensible, such as magnetic fields, ultrasonic waves, and odorless toxic gases or liquids, can further broaden the utilization of HIDs. Field-induced electroluminescence (EL) of either organic or inorganic fluorescent materials under alternating current (AC) has been extensively studied and its unique device architecture in which an emitting layer is separated with an insulator from electrode offers a new platform for designing and developing emerging HIDs. Here, we present various sensory and extra-sensory interactive displays based on AC EL.","PeriodicalId":19672,"journal":{"name":"Organic and Hybrid Light Emitting Materials and Devices XXV","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80275942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Le Yang, Zhihong Yang, Xian Wei Chua, Vincent Kim, Yaxiao Lian, Baodan Zhao, B. Ehrler, D. Di, R. Friend
The efficiency of OLEDs is fundamentally determined by the spin of excited state electrons. We have previously shown, using a new class of emissive molecules, carbene-metal-amides (CMA), an unusual emission pathway based on spin-state inter-conversion - intramolecular rotation induces a shift in the relative energies of the first excited singlet and triplet states, leading to extremely efficient singlet-triplet state interconversion and photoemission. In our recent work, we report solution-processed dual-dopant polymer LEDs, in which highly efficient electroluminescence occurs via an intermolecular energy transfer from CMAs to a fluorescent emitter. With electroluminescence from the simple fluorophore, we obtained record EQEs of >20% in these devices. Photophysical measurements indicate that ultrafast inter-fluorophore energy transfer occurs with near-unity efficiency. They preserve the relative colour purity of simple fluorophores, potential for energy-efficient printable electronics.
{"title":"Highly efficient dual-dopant enhanced emission OLEDs","authors":"Le Yang, Zhihong Yang, Xian Wei Chua, Vincent Kim, Yaxiao Lian, Baodan Zhao, B. Ehrler, D. Di, R. Friend","doi":"10.1117/12.2595396","DOIUrl":"https://doi.org/10.1117/12.2595396","url":null,"abstract":"The efficiency of OLEDs is fundamentally determined by the spin of excited state electrons. We have previously shown, using a new class of emissive molecules, carbene-metal-amides (CMA), an unusual emission pathway based on spin-state inter-conversion - intramolecular rotation induces a shift in the relative energies of the first excited singlet and triplet states, leading to extremely efficient singlet-triplet state interconversion and photoemission. In our recent work, we report solution-processed dual-dopant polymer LEDs, in which highly efficient electroluminescence occurs via an intermolecular energy transfer from CMAs to a fluorescent emitter. With electroluminescence from the simple fluorophore, we obtained record EQEs of >20% in these devices. Photophysical measurements indicate that ultrafast inter-fluorophore energy transfer occurs with near-unity efficiency. They preserve the relative colour purity of simple fluorophores, potential for energy-efficient printable electronics.","PeriodicalId":19672,"journal":{"name":"Organic and Hybrid Light Emitting Materials and Devices XXV","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86358496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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