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231224s2013 xx |||||o 00| ||eng c |
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|a 10.1002/adma.201300753
|2 doi
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|a pubmed24n0759.xml
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|a (DE-627)NLM227758005
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|a (NLM)23703877
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
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|a Dias, Fernando B
|e verfasserin
|4 aut
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| 245 |
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|a Triplet harvesting with 100% efficiency by way of thermally activated delayed fluorescence in charge transfer OLED emitters
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|c 2013
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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 Completed 07.04.2014
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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 Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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|a Organic light-emitting diodes (OLEDs) have their performance limited by the number of emissive singlet states created upon charge recombination (25%). Recently, a novel strategy has been proposed, based on thermally activated up-conversion of triplet to singlet states, yielding delayed fluorescence (TADF), which greatly enhances electroluminescence. The energy barrier for this reverse intersystem crossing mechanism is proportional to the exchange energy (ΔEST ) between the singlet and triplet states; therefore, materials with intramolecular charge transfer (ICT) states, where it is known that the exchange energy is small, are perfect candidates. However, here it is shown that triplet states can be harvested with 100% efficiency via TADF, even in materials with ΔEST of more than 20 kT (where k is the Boltzmann constant and T is the temperature) at room temperature. The key role played by lone pair electrons in achieving this high efficiency in a series of ICT molecules is elucidated. The results show the complex photophysics of efficient TADF materials and give clear guidelines for designing new emitters
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|a Journal Article
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|a conjugated materials
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|a delayed fluorescence
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|a organic light-emitting diodes
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4 |
|a organic semiconductors
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1 |
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|a Bourdakos, Konstantinos N
|e verfasserin
|4 aut
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1 |
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|a Jankus, Vygintas
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Moss, Kathryn C
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Kamtekar, Kiran T
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Bhalla, Vandana
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Santos, José
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Bryce, Martin R
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Monkman, Andrew P
|e verfasserin
|4 aut
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| 773 |
0 |
8 |
|i Enthalten in
|t Advanced materials (Deerfield Beach, Fla.)
|d 1998
|g 25(2013), 27 vom: 19. Juli, Seite 3707-14
|w (DE-627)NLM098206397
|x 1521-4095
|7 nnns
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| 773 |
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|g volume:25
|g year:2013
|g number:27
|g day:19
|g month:07
|g pages:3707-14
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|u http://dx.doi.org/10.1002/adma.201300753
|3 Volltext
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