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Molecular-Scale Strategies to Achieve High Efficiency and Low Efficiency Roll-off in Simplified Solution-Processed Organic Light-Emitting Diodes
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Kim, Young-Hoon | - |
dc.contributor.author | Han, Tae-Hee | - |
dc.contributor.author | Lee, Changsoo | - |
dc.contributor.author | Kim, Yun-Hi | - |
dc.contributor.author | Yang, Yang | - |
dc.contributor.author | Lee, Tae-Woo | - |
dc.date.accessioned | 2022-04-20T11:35:12Z | - |
dc.date.available | 2022-04-20T11:35:12Z | - |
dc.date.created | 2021-01-25 | - |
dc.date.created | 2021-01-25 | - |
dc.date.issued | 2020-11 | - |
dc.identifier.citation | Advanced Functional Materials, Vol.30 No.46, p. 2005292 | - |
dc.identifier.issn | 1616-301X | - |
dc.identifier.other | 121468 | - |
dc.identifier.uri | https://hdl.handle.net/10371/179122 | - |
dc.description.abstract | Solution-processed small-molecule organic light-emitting diodes (OLEDs) are regarded as next-generation flat-panel displays and solid-state lighting sources due to low material loss and a simple device fabrication process. However, they still suffer from low device efficiency and severe efficiency roll-off. Here, molecular-scale strategies are proposed to achieve highly efficient solution-processed small-molecule OLEDs with reduced efficiency roll-off. By combining experiments with ab initio and molecular dynamics simulations, it is shown that an acetylacetonate group in a phosphorescent dopants lowers the dipole moment and molecular interaction energy of dopants, reducing dopant aggregation and increasing charge carrier transport. Furthermore, a charge-balance assistant molecule is incorporated in the mixed-host emitting layer to increase the balance of charge carrier transport and to broaden the exciton recombination zone in the center of the emitting layer. The resulting OLEDs have a current efficiency (CE) of 103.7 cd A(-1), which is the highest yet reported in solution-processed OLEDs, and low efficiency roll-off (CE=99.68 cd A(-1)at a luminanceL(EL)=100 cd m(-2), and CE=75.00 cd A(-1)atL(EL)=1000 cd m(-2)) even with the simplified device architecture. It is expected that this strategy will advance the feasibility of commercialization of low-cost high-efficiency OLEDs. | - |
dc.language | 영어 | - |
dc.publisher | John Wiley & Sons Ltd. | - |
dc.title | Molecular-Scale Strategies to Achieve High Efficiency and Low Efficiency Roll-off in Simplified Solution-Processed Organic Light-Emitting Diodes | - |
dc.type | Article | - |
dc.contributor.AlternativeAuthor | 이태우 | - |
dc.identifier.doi | 10.1002/adfm.202005292 | - |
dc.citation.journaltitle | Advanced Functional Materials | - |
dc.identifier.wosid | 000568795700001 | - |
dc.identifier.scopusid | 2-s2.0-85090466332 | - |
dc.citation.number | 46 | - |
dc.citation.startpage | 2005292 | - |
dc.citation.volume | 30 | - |
dc.identifier.sci | 000568795700001 | - |
dc.description.isOpenAccess | N | - |
dc.contributor.affiliatedAuthor | Lee, Tae-Woo | - |
dc.type.docType | Article | - |
dc.description.journalClass | 1 | - |
dc.subject.keywordPlus | CHARGE-CARRIER TRANSPORT | - |
dc.subject.keywordPlus | ENERGY-TRANSFER | - |
dc.subject.keywordPlus | LAYER | - |
dc.subject.keywordPlus | ORIENTATION | - |
dc.subject.keywordPlus | INDEX | - |
dc.subject.keywordPlus | AGGREGATION | - |
dc.subject.keywordPlus | DEGRADATION | - |
dc.subject.keywordPlus | POLYMER | - |
dc.subject.keywordPlus | FILMS | - |
dc.subject.keywordAuthor | charge balance | - |
dc.subject.keywordAuthor | charge-balance assistant molecules | - |
dc.subject.keywordAuthor | density functional theory | - |
dc.subject.keywordAuthor | dopant aggregation | - |
dc.subject.keywordAuthor | molecular dynamics | - |
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