{"corpus_id":2782316,"paper_sha":"f5e18098750372135d8ceabbcbf4a6d2ad1f0a5e","doi":"10.1038/ncomms9476","arxiv_id":null,"pmid":26477390,"pmcid":"4634127","mag_id":1924400271,"dblp_id":null,"acl_id":null,"title":"Purely organic electroluminescent material realizing 100% conversion from electricity to light","year":2015,"publication_date":"2015-10-19","venue":"Nature Communications","journal":{"name":"Nature Communications","pages":null,"volume":"6"},"journal_issn":null,"journal_title":null,"publication_types":["JournalArticle"],"pubmed_pub_types":["Journal Article","Research Support, Non-U.S. Gov't"],"s2_fields_of_study":["Chemistry","Medicine","Materials Science","Physics"],"reference_count":51,"citation_count":791,"influential_citation_count":7,"is_open_access":true,"arxiv_categories":null,"arxiv_license":null,"arxiv_journal_ref":null,"mesh_headings":null,"chemicals":null,"comments_corrections":null,"source_flags":5,"s2_open_access_pdf_url":"https://www.nature.com/articles/ncomms9476.pdf","s2_open_access_landing_url":"https://www.semanticscholar.org/paper/f5e18098750372135d8ceabbcbf4a6d2ad1f0a5e","s2_open_access_license":"CCBY","s2_open_access_status":"GOLD","pmc_open_access_pdf_url":null,"pmc_open_access_landing_url":null,"pmc_open_access_license":null,"pmc_open_access_status":null,"unpaywall_open_access_pdf_url":null,"unpaywall_open_access_landing_url":null,"unpaywall_open_access_license":null,"unpaywall_open_access_status":null,"abstract":"Efficient organic light-emitting diodes have been developed using emitters containing rare metals, such as platinum and iridium complexes. However, there is an urgent need to develop emitters composed of more abundant materials. Here we show a thermally activated delayed fluorescence material for organic light-emitting diodes, which realizes both approximately 100% photoluminescence quantum yield and approximately 100% up-conversion of the triplet to singlet excited state. The material contains electron-donating diphenylaminocarbazole and electron-accepting triphenyltriazine moieties. The typical trade-off between effective emission and triplet-to-singlet up-conversion is overcome by fine-tuning the highest occupied molecular orbital and lowest unoccupied molecular orbital distributions. The nearly zero singlet–triplet energy gap, smaller than the thermal energy at room temperature, results in an organic light-emitting diode with external quantum efficiency of 29.6%. An external quantum efficiency of 41.5% is obtained when using an out-coupling sheet. The external quantum efficiency is 30.7% even at a high luminance of 3,000 cd m−2. Organic light-emitting diodes promise a more environment-friendly future for light sources, but many use rare metals. Here, the authors present an approach that achieves external quantum efficiency over 40% by realising 100% up-conversion from triplet to singlet excitons and thus 100% radiative emission.","claims":[{"public_id":"cl_268754a078df8557c91c8f567ba0b0ee","status":"active","text":"A thermally activated delayed fluorescence material containing electron-donating diphenylaminocarbazole and electron-accepting triphenyltriazine moieties achieves both approximately 100% photoluminescence quantum yield and approximately 100% up-conversion of triplet to singlet excited state.","confidence":0.95,"contributors":[{"id":32,"public_id":"7c402c1b98","public_label":"뀨 (7c402c1b98)","roles":["extraction"],"url":"https://sah.borca.ai/u/7c402c1b98"},{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous 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29.6%.","confidence":0.95,"contributors":[{"id":32,"public_id":"7c402c1b98","public_label":"뀨 (7c402c1b98)","roles":["extraction"],"url":"https://sah.borca.ai/u/7c402c1b98"},{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["review"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_38423dcbe480b83a3d914992ac3d9493"},{"public_id":"cl_510b69647e0a36df157ee9eaa57e93c9","status":"active","text":"The organic light-emitting diode achieves an external quantum efficiency of 30.7% even at a high luminance of 3,000 cd m−2.","confidence":0.95,"contributors":[{"id":32,"public_id":"7c402c1b98","public_label":"뀨 (7c402c1b98)","roles":["extraction"],"url":"https://sah.borca.ai/u/7c402c1b98"},{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous 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