OperaV1, Main, Exploration, bibRecord, 000559

Organic luminescent molecule with energetically equivalent singlet and triplet excited states for organic light-emitting diodes.

Identifieur interne : 000559 ( Main/Exploration ); précédent : 000558; suivant : 000560

Organic luminescent molecule with energetically equivalent singlet and triplet excited states for organic light-emitting diodes.

Auteurs : Keigo Sato [Japon] ; Katsuyuki Shizu [Japon] ; Kazuaki Yoshimura [Japon] ; Atsushi Kawada [Japon] ; Hiroshi Miyazaki [Japon] ; Chihaya Adachi [Japon]

Source :

Physical review letters ; 2013.

RBID : pubmed:25165959

English descriptors

KwdEn :
- Carbazoles (chemistry), Luminescent Measurements (methods), Models, Molecular, Photochemical Processes, Quantum Theory, Thermodynamics, Triazenes (chemistry).
MESH :
- chemical , chemistry : Carbazoles, Triazenes.
- methods : Luminescent Measurements.
- Models, Molecular, Photochemical Processes, Quantum Theory, Thermodynamics.

Abstract

We demonstrate an organic molecule with an energy gap between its singlet and triplet excited states of almost zero (ΔE(ST) ∼ 0 eV). Such separation was realized through proper combination of an electron-donating indolocarbazole group and a diphenyltriazine electron-accepting moiety. Calculated and measured ΔE(ST) were 0.003 and 0.02 eV, respectively. A total photoluminescence efficiency of 59% ± 2% with 45% ± 2% from a delayed component and 14% ± 2% from a prompt component was obtained for a doped film. Organic light emitting diodes containing this molecule as an emitting dopant exhibited an unexpectedly high external electroluminescence efficiency of η(EQE) = 14% ± 1%.

DOI: 10.1103/PhysRevLett.110.247401
PubMed: 25165959

Affiliations:

Japon

Le document en format XML

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<author><name sortKey="Sato, Keigo" sort="Sato, Keigo" uniqKey="Sato K" first="Keigo" last="Sato">Keigo Sato</name>
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<country xml:lang="fr">Japon</country>
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<author><name sortKey="Shizu, Katsuyuki" sort="Shizu, Katsuyuki" uniqKey="Shizu K" first="Katsuyuki" last="Shizu">Katsuyuki Shizu</name>
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<author><name sortKey="Yoshimura, Kazuaki" sort="Yoshimura, Kazuaki" uniqKey="Yoshimura K" first="Kazuaki" last="Yoshimura">Kazuaki Yoshimura</name>
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<author><name sortKey="Kawada, Atsushi" sort="Kawada, Atsushi" uniqKey="Kawada A" first="Atsushi" last="Kawada">Atsushi Kawada</name>
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<author><name sortKey="Miyazaki, Hiroshi" sort="Miyazaki, Hiroshi" uniqKey="Miyazaki H" first="Hiroshi" last="Miyazaki">Hiroshi Miyazaki</name>
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<author><name sortKey="Adachi, Chihaya" sort="Adachi, Chihaya" uniqKey="Adachi C" first="Chihaya" last="Adachi">Chihaya Adachi</name>
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<author><name sortKey="Shizu, Katsuyuki" sort="Shizu, Katsuyuki" uniqKey="Shizu K" first="Katsuyuki" last="Shizu">Katsuyuki Shizu</name>
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<wicri:regionArea>Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395</wicri:regionArea>
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<author><name sortKey="Yoshimura, Kazuaki" sort="Yoshimura, Kazuaki" uniqKey="Yoshimura K" first="Kazuaki" last="Yoshimura">Kazuaki Yoshimura</name>
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<author><name sortKey="Kawada, Atsushi" sort="Kawada, Atsushi" uniqKey="Kawada A" first="Atsushi" last="Kawada">Atsushi Kawada</name>
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<country xml:lang="fr">Japon</country>
<wicri:regionArea>Functional Materials Laboratories, Nippon Steel Chemical Co., Ltd., 46-80 Nakabaru, Sakinohama, Tobata, Kitakyushu, Fukuoka 804-8503</wicri:regionArea>
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<author><name sortKey="Miyazaki, Hiroshi" sort="Miyazaki, Hiroshi" uniqKey="Miyazaki H" first="Hiroshi" last="Miyazaki">Hiroshi Miyazaki</name>
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<country xml:lang="fr">Japon</country>
<wicri:regionArea>Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan and International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395</wicri:regionArea>
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<series><title level="j">Physical review letters</title>
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<term>Photochemical Processes</term>
<term>Quantum Theory</term>
<term>Thermodynamics</term>
<term>Triazenes (chemistry)</term>
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<term>Quantum Theory</term>
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<front><div type="abstract" xml:lang="en">We demonstrate an organic molecule with an energy gap between its singlet and triplet excited states of almost zero (ΔE(ST) ∼ 0 eV). Such separation was realized through proper combination of an electron-donating indolocarbazole group and a diphenyltriazine electron-accepting moiety. Calculated and measured ΔE(ST) were 0.003 and 0.02 eV, respectively. A total photoluminescence efficiency of 59% ± 2% with 45% ± 2% from a delayed component and 14% ± 2% from a prompt component was obtained for a doped film. Organic light emitting diodes containing this molecule as an emitting dopant exhibited an unexpectedly high external electroluminescence efficiency of η(EQE) = 14% ± 1%.</div>
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<tree><country name="Japon"><noRegion><name sortKey="Sato, Keigo" sort="Sato, Keigo" uniqKey="Sato K" first="Keigo" last="Sato">Keigo Sato</name>
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<name sortKey="Adachi, Chihaya" sort="Adachi, Chihaya" uniqKey="Adachi C" first="Chihaya" last="Adachi">Chihaya Adachi</name>
<name sortKey="Kawada, Atsushi" sort="Kawada, Atsushi" uniqKey="Kawada A" first="Atsushi" last="Kawada">Atsushi Kawada</name>
<name sortKey="Miyazaki, Hiroshi" sort="Miyazaki, Hiroshi" uniqKey="Miyazaki H" first="Hiroshi" last="Miyazaki">Hiroshi Miyazaki</name>
<name sortKey="Shizu, Katsuyuki" sort="Shizu, Katsuyuki" uniqKey="Shizu K" first="Katsuyuki" last="Shizu">Katsuyuki Shizu</name>
<name sortKey="Yoshimura, Kazuaki" sort="Yoshimura, Kazuaki" uniqKey="Yoshimura K" first="Kazuaki" last="Yoshimura">Kazuaki Yoshimura</name>
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Organic luminescent molecule with energetically equivalent singlet and triplet excited states for organic light-emitting diodes.

Organic luminescent molecule with energetically equivalent singlet and triplet excited states for organic light-emitting diodes.

Source :

English descriptors

Abstract

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