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231225s2020 xx |||||o 00| ||eng c |
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|a 10.1002/adma.202000936
|2 doi
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|a pubmed24n1037.xml
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|a (NLM)32537946
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|a eng
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|a Park, Minsu
|e verfasserin
|4 aut
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|a Controllable Singlet-Triplet Energy Splitting of Graphene Quantum Dots through Oxidation
|b From Phosphorescence to TADF
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|c 2020
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Revised 30.09.2020
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a © 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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|a Long-lived afterglow emissions, such as room-temperature phosphorescence (RTP) and thermally activated delayed fluorescence (TADF), are beneficial in the fields of displays, bioimaging, and data security. However, it is challenging to realize a single material that simultaneously exhibits both RTP and TADF properties with their relative strengths varied in a controlled manner. Herein, a new design approach is reported to control singlet-triplet energy splitting (∆EST ) in graphene quantum dots (GQD)/graphene oxide quantum dots (GOQDs) by varying the ratio of oxygenated carbon to sp2 carbon (γOC ). It is demonstrated that ∆EST decreases from 0.365 to 0.123 eV as γOC increases from 4.63% to 59.6%, which in turn induces a dramatic transition from RTP to TADF. Matrix-assisted stabilization of triplet excited states provides ultralong lifetimes to both RTP and TADF. Embedded in boron oxynitride, the low oxidized (4.63%) GQD exhibits an RTP lifetime (τT avg ) of 783 ms, and the highly oxidized (59.6%) GOQD exhibits a TADF lifetime (τDF avg ) of 125 ms. Furthermore, the long-lived RTP and TADF materials enable the first demonstration of anticounterfeiting and multilevel information security using GQD. These results will open up a new approach to the engineering of singlet-triplet splitting in GQD for controlled realization of smart multimodal afterglow materials
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|a Journal Article
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|a anticounterfeiting
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|a graphene quantum dots
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|a phosphorescence
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|a singlet-triplet energy splitting
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| 650 |
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|a thermally activated delayed fluorescence
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1 |
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|a Kim, Hyung Suk
|e verfasserin
|4 aut
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|a Yoon, Hyewon
|e verfasserin
|4 aut
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1 |
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|a Kim, Jin
|e verfasserin
|4 aut
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| 700 |
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|a Lee, Sukki
|e verfasserin
|4 aut
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| 700 |
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|a Yoo, Seunghyup
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Jeon, Seokwoo
|e verfasserin
|4 aut
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| 773 |
0 |
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|i Enthalten in
|t Advanced materials (Deerfield Beach, Fla.)
|d 1998
|g 32(2020), 31 vom: 19. Aug., Seite e2000936
|w (DE-627)NLM098206397
|x 1521-4095
|7 nnns
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| 773 |
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|g volume:32
|g year:2020
|g number:31
|g day:19
|g month:08
|g pages:e2000936
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|u http://dx.doi.org/10.1002/adma.202000936
|3 Volltext
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