Triplet–Triplet Annihilation in 9,10-Diphenylanthracene Derivatives: The Role of Intersystem Crossing and Exciton Diffusion
Triplet–triplet annihilation (TTA) is an attractive way to boost the efficiency of conventional fluorescent organic light-emitting diodes (OLEDs). TTA-active anthracene derivatives are often considered as state-of-the-art emitters due to the proper energy level alignment. In this work, TTA propertie...
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Published in | Journal of physical chemistry. C Vol. 121; no. 15; pp. 8515 - 8524 |
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Main Authors | , , , , , , , , , , |
Format | Journal Article |
Language | English |
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American Chemical Society
20.04.2017
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Abstract | Triplet–triplet annihilation (TTA) is an attractive way to boost the efficiency of conventional fluorescent organic light-emitting diodes (OLEDs). TTA-active anthracene derivatives are often considered as state-of-the-art emitters due to the proper energy level alignment. In this work, TTA properties of a series of highly fluorescent nonsymmetrical anthracene compounds bearing 9-(4-arylphenyl) moiety and 10-(4-hexylphenyl) fragments were assessed. Two different methods to enhance the TTA efficiency are demonstrated. First, the intensity of TTA-based delayed fluorescence directly depended on the intersystem crossing (ISC) rate. This ISC rate can be significantly enhanced in more conjugated compounds due to the resonant alignment of S1 and T2 energy levels. While enhanced ISC rate slightly quenches the intensity of prompt fluorescence, the rise of the triplet population boosts the intensity of resultant delayed fluorescence. Second, the triplet annihilation rate can be significantly enhanced by optimization of triplet exciton diffusion regime in the films of anthracene derivatives. We show that the proper layer preparation technology has a crucial influence on uniformity and energetic disorder of the film. This enhances the nondispersive triplet diffusion and increases the resulting delayed fluorescence intensity. |
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AbstractList | Triplet–triplet annihilation (TTA) is an attractive way to boost the efficiency of conventional fluorescent organic light-emitting diodes (OLEDs). TTA-active anthracene derivatives are often considered as state-of-the-art emitters due to the proper energy level alignment. In this work, TTA properties of a series of highly fluorescent nonsymmetrical anthracene compounds bearing 9-(4-arylphenyl) moiety and 10-(4-hexylphenyl) fragments were assessed. Two different methods to enhance the TTA efficiency are demonstrated. First, the intensity of TTA-based delayed fluorescence directly depended on the intersystem crossing (ISC) rate. This ISC rate can be significantly enhanced in more conjugated compounds due to the resonant alignment of S1 and T2 energy levels. While enhanced ISC rate slightly quenches the intensity of prompt fluorescence, the rise of the triplet population boosts the intensity of resultant delayed fluorescence. Second, the triplet annihilation rate can be significantly enhanced by optimization of triplet exciton diffusion regime in the films of anthracene derivatives. We show that the proper layer preparation technology has a crucial influence on uniformity and energetic disorder of the film. This enhances the nondispersive triplet diffusion and increases the resulting delayed fluorescence intensity. |
Author | Miasojedovas, Aru̅nas Monkman, Andy Adomėnas, Povilas Kazlauskas, Karolis Komskis, Regimantas Jankauskas, Vygintas Kreiza, Gediminas Adomėnienė, Ona Serevičius, Tomas Juršėnas, Saulius Jankus, Vygintas |
AuthorAffiliation | Durham University Institute of Applied Research Department of Solid State Electronics Department of Physics |
AuthorAffiliation_xml | – name: Institute of Applied Research – name: Department of Physics – name: Department of Solid State Electronics – name: Durham University |
Author_xml | – sequence: 1 givenname: Tomas orcidid: 0000-0003-1319-7669 surname: Serevičius fullname: Serevičius, Tomas email: tomas.serevicius@ff.stud.vu.lt organization: Institute of Applied Research – sequence: 2 givenname: Regimantas surname: Komskis fullname: Komskis, Regimantas organization: Institute of Applied Research – sequence: 3 givenname: Povilas surname: Adomėnas fullname: Adomėnas, Povilas organization: Institute of Applied Research – sequence: 4 givenname: Ona surname: Adomėnienė fullname: Adomėnienė, Ona organization: Institute of Applied Research – sequence: 5 givenname: Gediminas surname: Kreiza fullname: Kreiza, Gediminas organization: Institute of Applied Research – sequence: 6 givenname: Vygintas surname: Jankauskas fullname: Jankauskas, Vygintas organization: Department of Solid State Electronics – sequence: 7 givenname: Karolis surname: Kazlauskas fullname: Kazlauskas, Karolis organization: Institute of Applied Research – sequence: 8 givenname: Aru̅nas surname: Miasojedovas fullname: Miasojedovas, Aru̅nas organization: Durham University – sequence: 9 givenname: Vygintas surname: Jankus fullname: Jankus, Vygintas organization: Durham University – sequence: 10 givenname: Andy orcidid: 0000-0002-0784-8640 surname: Monkman fullname: Monkman, Andy organization: Durham University – sequence: 11 givenname: Saulius surname: Juršėnas fullname: Juršėnas, Saulius organization: Institute of Applied Research |
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Title | Triplet–Triplet Annihilation in 9,10-Diphenylanthracene Derivatives: The Role of Intersystem Crossing and Exciton Diffusion |
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