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|a Effect of the Number and Substitution Pattern of Carbazole Donors on the Singlet and Triplet State Energies in a Series of Carbazole-Oxadiazole Derivatives Exhibiting Thermally Activated Delayed Fluorescence.
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|a Washington, D.C. :
|b United States. Department of Energy. Office of Energy Efficiency and Renewable Energy ;
|a Oak Ridge, Tenn. :
|b Distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
|c 2018.
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|a Size: p. 6389-6399 :
|b digital, PDF file.
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|a text
|b txt
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|a Published through Scitech Connect.
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|a 09/10/2018.
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|a "Journal ID: ISSN 0897-4756."
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|a Cooper, Matthew W. ; Zhang, Xiaoqing ; Zhang, Yadong ; Jeon, Soon Ok ; Lee, Hasup ; Kim, Sunghan ; Fuentes-Hernandez, Canek ; Barlow, Stephen ; Kippelen, Bernard ; Marder, Seth R. ; et al;
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|a Georgia Institute of Technology, Atlanta, GA (United States)
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|a Substitution of a varying number of 9H-carbazole donors onto 2-(pentafluorophenyl)-5-phenyl-1,3,4-oxadiazole yields a series of donor?acceptor compounds with similar electrochemical band gaps, but dissimilar optical properties. Each substitution of a carbazole onto the 2- and 4-positions results in a 150?200 meV stabilization of the first singlet excited state, evident in the fluorescent emission. Here, the first triplet excited state is less sensitive to these substitutions, leading to a reduced energy separation between the singlet and triplet states, ?E<sub>ST</sub>, with increasing carbazole content. OLED devices made using the donor?acceptor compounds exhibiting the lowest ?E<sub>ST</sub> were fabricated and exhibit sky blue emission with an external quantum efficiency of up to 24.4% at a luminance of 10 cd m<sup>?2</sup>, and 9.2% at 1000 cd m<sup>?2</sup>
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|a 36 materials science
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|a Solid state lighting
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|a Organic light-emitting diodes
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|a External quantum efficiency
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|a Electrical energy
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|a Aromatic compounds
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|a Quantum mechanics
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|a United States. Department of Energy. Office of Energy Efficiency and Renewable Energy.
|4 spn.
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|a United States.
|b Department of Energy.
|b Office of Scientific and Technical Information
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|u https://www.osti.gov/servlets/purl/1767449
|z Full Text (via OSTI)
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|a .b117710131
|b 04-01-21
|c 04-01-21
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