Derivatives of triphenyltriazine and di-tert-butylcarbazole as TADF emitters for sky-blue OLEDs

Oleksandr Bezvikonnyi; Dalius Gudeika; Dmytro Volyniuk; Audrius Bucinskas; Juozas V. Grazulevicius

doi:10.1016/j.mseb.2021.115441

Derivatives of triphenyltriazine and di-tert-butylcarbazole as TADF emitters for sky-blue OLEDs

Oleksandr Bezvikonnyi
, Dalius Gudeika
, Dmytro Volyniuk
, Audrius Bucinskas
, Juozas V. Grazulevicius^*

^*Corresponding author for this work

Kaunas University of Technology

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

13 Citations (Scopus)

Abstract

The phenomena of triplet exciton up-conversion by thermally activated delayed fluorescence (TADF) and hybridized local and charge transfer states (HLCT) are approached to extend the internal quantum efficiency (IQE) of emitters potentially to 100%. Here, the series of newly designed and synthesized triphenyltriazines substituted by tert-butylcarbazolyl moieties were investigated. The compounds exhibited good charge-injecting abilities, and bipolar well-balanced charge transport mobility values reaching 10^-3 cm²/Vs at electric fields higher than 3.6 × 10⁵ V/s. The compounds were found to exhibit TADF properties in guest–host systems. Series of organic light emitting diodes (OLEDs) were fabricated exhibiting sky-blue electroluminescence with the intensity maxima at ca. 480 nm. Optimization of the OLEDs by the introduction of the host material with a HLCT resulted in the increase of EQE up to 5.8% for the device containing derivative of methoxy-substituted triphenyl triazine and di-tert-butylcarbazole as TADF emitter.

Original language	English
Article number	115441
Journal	Materials Science and Engineering: B
Volume	273
DOIs	https://doi.org/10.1016/j.mseb.2021.115441
Publication status	Published - Nov 2021
Externally published	Yes

Keywords

Di-tert-butylcarbazole
HLCT host
OLED
Sky-blue
TADF
Triphenyltriazine

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title = "Derivatives of triphenyltriazine and di-tert-butylcarbazole as TADF emitters for sky-blue OLEDs",

abstract = "The phenomena of triplet exciton up-conversion by thermally activated delayed fluorescence (TADF) and hybridized local and charge transfer states (HLCT) are approached to extend the internal quantum efficiency (IQE) of emitters potentially to 100\%. Here, the series of newly designed and synthesized triphenyltriazines substituted by tert-butylcarbazolyl moieties were investigated. The compounds exhibited good charge-injecting abilities, and bipolar well-balanced charge transport mobility values reaching 10-3 cm2/Vs at electric fields higher than 3.6 × 105 V/s. The compounds were found to exhibit TADF properties in guest–host systems. Series of organic light emitting diodes (OLEDs) were fabricated exhibiting sky-blue electroluminescence with the intensity maxima at ca. 480 nm. Optimization of the OLEDs by the introduction of the host material with a HLCT resulted in the increase of EQE up to 5.8\% for the device containing derivative of methoxy-substituted triphenyl triazine and di-tert-butylcarbazole as TADF emitter.",

keywords = "Di-tert-butylcarbazole, HLCT host, OLED, Sky-blue, TADF, Triphenyltriazine",

author = "Oleksandr Bezvikonnyi and Dalius Gudeika and Dmytro Volyniuk and Audrius Bucinskas and Grazulevicius, \{Juozas V.\}",

note = "Publisher Copyright: {\textcopyright} 2021 Elsevier B.V.",

year = "2021",

month = nov,

doi = "10.1016/j.mseb.2021.115441",

language = "English",

volume = "273",

journal = "Materials Science and Engineering: B",

issn = "0921-5107",

publisher = "Elsevier Ltd",

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TY - JOUR

T1 - Derivatives of triphenyltriazine and di-tert-butylcarbazole as TADF emitters for sky-blue OLEDs

AU - Bezvikonnyi, Oleksandr

AU - Gudeika, Dalius

AU - Volyniuk, Dmytro

AU - Bucinskas, Audrius

AU - Grazulevicius, Juozas V.

PY - 2021/11

Y1 - 2021/11

N2 - The phenomena of triplet exciton up-conversion by thermally activated delayed fluorescence (TADF) and hybridized local and charge transfer states (HLCT) are approached to extend the internal quantum efficiency (IQE) of emitters potentially to 100%. Here, the series of newly designed and synthesized triphenyltriazines substituted by tert-butylcarbazolyl moieties were investigated. The compounds exhibited good charge-injecting abilities, and bipolar well-balanced charge transport mobility values reaching 10-3 cm2/Vs at electric fields higher than 3.6 × 105 V/s. The compounds were found to exhibit TADF properties in guest–host systems. Series of organic light emitting diodes (OLEDs) were fabricated exhibiting sky-blue electroluminescence with the intensity maxima at ca. 480 nm. Optimization of the OLEDs by the introduction of the host material with a HLCT resulted in the increase of EQE up to 5.8% for the device containing derivative of methoxy-substituted triphenyl triazine and di-tert-butylcarbazole as TADF emitter.

AB - The phenomena of triplet exciton up-conversion by thermally activated delayed fluorescence (TADF) and hybridized local and charge transfer states (HLCT) are approached to extend the internal quantum efficiency (IQE) of emitters potentially to 100%. Here, the series of newly designed and synthesized triphenyltriazines substituted by tert-butylcarbazolyl moieties were investigated. The compounds exhibited good charge-injecting abilities, and bipolar well-balanced charge transport mobility values reaching 10-3 cm2/Vs at electric fields higher than 3.6 × 105 V/s. The compounds were found to exhibit TADF properties in guest–host systems. Series of organic light emitting diodes (OLEDs) were fabricated exhibiting sky-blue electroluminescence with the intensity maxima at ca. 480 nm. Optimization of the OLEDs by the introduction of the host material with a HLCT resulted in the increase of EQE up to 5.8% for the device containing derivative of methoxy-substituted triphenyl triazine and di-tert-butylcarbazole as TADF emitter.

KW - Di-tert-butylcarbazole

KW - HLCT host

KW - OLED

KW - Sky-blue

KW - TADF

KW - Triphenyltriazine

UR - https://www.scopus.com/pages/publications/85114793629

U2 - 10.1016/j.mseb.2021.115441

DO - 10.1016/j.mseb.2021.115441

M3 - Article

AN - SCOPUS:85114793629

SN - 0921-5107

VL - 273

JO - Materials Science and Engineering: B

JF - Materials Science and Engineering: B

M1 - 115441

ER -

Derivatives of triphenyltriazine and di-tert-butylcarbazole as TADF emitters for sky-blue OLEDs

Abstract

Keywords

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