14 research outputs found

    Towards a GDPR-Compliant Blockchain-Based COVID Vaccination Passport

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    The COVID-19 pandemic has shaken the world and limited work/personal life activities. Besides the loss of human lives and agony faced by humankind, the pandemic has badly hit different sectors economically, including the travel industry. Special arrangements, including COVID test before departure and on arrival, and voluntary quarantine, were enforced to limit the risk of transmission. However, the hope for returning to a normal (pre-COVID) routine relies on the success of the current COVID vaccination drives administered by different countries. To open for tourism and other necessary travel, a need is realized for a universally accessible proof of COVID vaccination, allowing travelers to cross the borders without any hindrance. This paper presents an architectural framework for a GDPR-compliant blockchain-based COVID vaccination passport (VacciFi), whilst considering the relevant developments, especially in the European Union region

    Corrigendum:What Controls the Orientation of TADF Emitters? (Front. Chem., (2020), 8, (750), 10.3389/fchem.2020.00750)

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    In the original article, there was a mistake in Supplementary Figure S8 of the Supplementary Material, and derived from that, in Table 1 as well as Figures 7A, 8A as published. The measured values of the GSP for two of the host materials, viz. BCPO and PO9, were interchanged by mistake. These values also resulted in a wrong calculation of the degree of PDMalignment (Λ). The corrected Table 1 as well as Figures 7A, 8A are attached below. (Figure presented.). The authors apologize for this error and state that this does not change the scientific conclusions of the article in any way. The original article and the Supporting Material have been updated.</p

    Efficient sky-blue organic light-emitting diodes using a highly horizontally oriented thermally activated delayed fluorescence emitter

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    Funding: Deutsche Forschungsgemeinschaft (Grant Number(s): SFB1176), Engineering and Physical Sciences Research Council (Grant Number(s): EP/P010482/1), China Scholarship Council (Grant Number(s): 201606890009), H2020 Marie Skłodowska-Curie Actions (Grant Number(s): 812872).Organic thermally activated delayed fluorescent (TADF) materials can harvest 100% of the electrically generated excitons as a result of their small singlet-triplet energy difference. However, maximizing the External Quantum Efficiency (EQE) of a device also requires enhancing the light-outcoupling efficiency. In this work, we present a new Acceptor-Donor-Acceptor (ADA) emitter employing an indolocarbazole donor and diphenyltriazine acceptors that shows nearly-completely horizontal orientation regardless of the host matrix, leading to a sky-blue OLED (λEL=483nm, CIE coordinates of 0.17, 0.32) with EQEMAX of 22.1%, a maximum luminance of 7800 cd/m2 and blue emission.Publisher PDFPeer reviewe
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