Dicarbazolyldicyanobenzenes as thermally activated delayed fluorescence emitters: Effect of substitution position on photoluminescent and electroluminescent properties

Bo Li; Hiroko Nomura; Hiroshi Miyazaki; Qisheng Zhang; Kou Yoshida; Yoshinori Suzuma; Akihiro Orita; Junzo Otera; Chihaya Adachi

doi:10.1246/cl.130907

Dicarbazolyldicyanobenzenes as thermally activated delayed fluorescence emitters: Effect of substitution position on photoluminescent and electroluminescent properties

Bo Li, Hiroko Nomura, Hiroshi Miyazaki, Qisheng Zhang, Kou Yoshida, Yoshinori Suzuma, Akihiro Orita, Junzo Otera, Chihaya Adachi

Applied Chemistry

Research output: Contribution to journal › Article › peer-review

55 Citations (Scopus)

Abstract

We demonstrate two efficient blue-green thermally activated delayed fluorescence (TADF) compounds comprising a dimeric phenylcarbazole and four cyano substituents on the phenyl rings. A comparison of the 2,6-dicyano- substituted derivative (26IPNDCz) with the 3,5-dicyano-substituted derivative (35IPNDCz) shows that 26IPNDCz provides a larger dihedral angle and a lower decrease in the energy difference between the first singlet and triplet excited states (ΔE_ST) and the TADF lifetime. An organic light-emitting diode based on 26IPNDCz afforded an external quantum efficiency of 10% with reduced efficiency roll-off.

Original language	English
Pages (from-to)	319-321
Number of pages	3
Journal	Chemistry Letters
Volume	43
Issue number	3
DOIs	https://doi.org/10.1246/cl.130907
Publication status	Published - 2014

All Science Journal Classification (ASJC) codes

Chemistry(all)

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10.1246/cl.130907

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title = "Dicarbazolyldicyanobenzenes as thermally activated delayed fluorescence emitters: Effect of substitution position on photoluminescent and electroluminescent properties",

abstract = "We demonstrate two efficient blue-green thermally activated delayed fluorescence (TADF) compounds comprising a dimeric phenylcarbazole and four cyano substituents on the phenyl rings. A comparison of the 2,6-dicyano- substituted derivative (26IPNDCz) with the 3,5-dicyano-substituted derivative (35IPNDCz) shows that 26IPNDCz provides a larger dihedral angle and a lower decrease in the energy difference between the first singlet and triplet excited states (ΔEST) and the TADF lifetime. An organic light-emitting diode based on 26IPNDCz afforded an external quantum efficiency of 10% with reduced efficiency roll-off.",

author = "Bo Li and Hiroko Nomura and Hiroshi Miyazaki and Qisheng Zhang and Kou Yoshida and Yoshinori Suzuma and Akihiro Orita and Junzo Otera and Chihaya Adachi",

year = "2014",

doi = "10.1246/cl.130907",

language = "English",

volume = "43",

pages = "319--321",

journal = "Chemistry Letters",

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TY - JOUR

T1 - Dicarbazolyldicyanobenzenes as thermally activated delayed fluorescence emitters

T2 - Effect of substitution position on photoluminescent and electroluminescent properties

AU - Li, Bo

AU - Nomura, Hiroko

AU - Miyazaki, Hiroshi

AU - Zhang, Qisheng

AU - Yoshida, Kou

AU - Suzuma, Yoshinori

AU - Orita, Akihiro

AU - Otera, Junzo

AU - Adachi, Chihaya

PY - 2014

Y1 - 2014

N2 - We demonstrate two efficient blue-green thermally activated delayed fluorescence (TADF) compounds comprising a dimeric phenylcarbazole and four cyano substituents on the phenyl rings. A comparison of the 2,6-dicyano- substituted derivative (26IPNDCz) with the 3,5-dicyano-substituted derivative (35IPNDCz) shows that 26IPNDCz provides a larger dihedral angle and a lower decrease in the energy difference between the first singlet and triplet excited states (ΔEST) and the TADF lifetime. An organic light-emitting diode based on 26IPNDCz afforded an external quantum efficiency of 10% with reduced efficiency roll-off.

AB - We demonstrate two efficient blue-green thermally activated delayed fluorescence (TADF) compounds comprising a dimeric phenylcarbazole and four cyano substituents on the phenyl rings. A comparison of the 2,6-dicyano- substituted derivative (26IPNDCz) with the 3,5-dicyano-substituted derivative (35IPNDCz) shows that 26IPNDCz provides a larger dihedral angle and a lower decrease in the energy difference between the first singlet and triplet excited states (ΔEST) and the TADF lifetime. An organic light-emitting diode based on 26IPNDCz afforded an external quantum efficiency of 10% with reduced efficiency roll-off.

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DO - 10.1246/cl.130907

M3 - Article

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JO - Chemistry Letters

JF - Chemistry Letters

IS - 3

ER -

Dicarbazolyldicyanobenzenes as thermally activated delayed fluorescence emitters: Effect of substitution position on photoluminescent and electroluminescent properties

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