OLEDs based on the emission of interface and bulk exciplexes formed by cyano-substituted carbazole derivative

Skuodis, Eigirdas; Tomkevičienė, Aušra; Reghu, Renji R.; Pečiulytė, Laura; Ivaniuk, Khrystyna; Volyniuk, Dmytro; Bezvikonnyi, Oleksandr; Bagdžiūnas, Gintautas; Gudeika, Dalius

doi:10.1016/j.dyepig.2017.01.016

Cited by 45 publications

(21 citation statements)

References 51 publications

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“…As the mixing ratios of exciplexes would change their charge balance and affect the device performance, [13,14] the carrier transporting properties of four exciplexes were carefully investigated. [50] Moreover, the DBT-SADF:PO-T2T:NPB-based device exhibits the maximum efficiencies of 10.9 cd A −1 , 13.7 lm W −1 , and 4.1% for CE, PE, and EQE, respectively; while the maximum CE, PE, and EQE of NPB:PO-T2T-based device are respectively 2.0 cd A −1 , 1.84 lm W −1 , and 0.89%. As listed in Table 2, all four devices exhibit quite low turn-on voltages around 2.3 and 2.4 V, indicating the superiority of the exciplexes on carriers injection.…”

Section: Resultsmentioning

confidence: 99%

Tricomponent Exciplex Emitter Realizing over 20% External Quantum Efficiency in Organic Light‐Emitting Diode with Multiple Reverse Intersystem Crossing Channels

et al. 2019

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With the naturally separated frontier molecular orbitals, exciplexes are capable of thermally activated delayed fluorescence emitters for organic light‐emitting diodes (OLEDs). And, the current key issue for exciplex emitters is improving their exciton utilization. In this work, a strategy of building exciplex emitters with three components is proposed to realize multiple reverse intersystem crossing (RISC) channels, improving their exciton utilization by enhancing upconversion of nonradiative triplet excitons. Accordingly, a tricomponent exciplex DBT‐SADF:PO‐T2T:CDBP is constructed with three RISC channels respectively on DBT‐SADF, DBT‐SADF:PO‐T2T, and CDBP:PO‐T2T. Furthermore, its photoluminescence quantum yield and rate constant of the RISC process are successfully improved. In the OLED, DBT‐SADF:PO‐T2T:CDBP exhibits a remarkably high maximum external quantum efficiency (EQE) of 20.5%, which is the first report with an EQE over 20% for the OLEDs based on exciplex emitters to the best of our knowledge. This work not only demonstrates that introducing multiple RISC channels can effectively improve the exciton utilization of exciplex emitters, but also proves the superiority of the tricomponent exciplex strategy for further development of exciplex emitters.

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Section: Resultsmentioning

confidence: 99%

Tricomponent Exciplex Emitter Realizing over 20% External Quantum Efficiency in Organic Light‐Emitting Diode with Multiple Reverse Intersystem Crossing Channels

et al. 2019

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“…S7 †), indicating that the triplet excited state is involved in the emission mechanism, as in the case of the previously reported exciplex systems exhibiting TADF. 5,18 The excited state can be quenched by energy transfer and/or electron transfer to oxygen. However, the PL intensity was recovered by removing oxygen in a vacuum, although photodegradation was still observed even under vacuum.…”

Section: Resultsmentioning

confidence: 99%

“…Photoluminescence (PL) quantum yields of exciplex emissions tend to be low, and therefore the exciplex emissions have not been widely utilized in organic light-emitting diode (OLED) applications. 4,5 However, Goushi et al recently used the exciplex state between a hole-transporting layer (HTL) and an electron-transporting layer (ETL), in which the energy difference between the excited singlet state and triplet state becomes small and favourable to achieve thermally activated delayed uorescence (TADF), enhancing the internal quantum efficiency of uorescent OLEDs. 6 Park and Sun et al reported an exciplex co-host for phosphorescent and uorescent emitters in OLEDs having a high external quantum efficiency (EQE) of approximately 30%.…”

Section: Introductionmentioning

confidence: 99%

Exciplex emissions derived from exceptionally long-distance donor and acceptor molecules

Koyama

Otsuki

et al. 2019

Chem. Sci.

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“…It should be noted that carbazole and benzonitrile derivatives usually do not show TADF or AIEE effects. Therefore, these derivatives have to be carefully designed for getting both TADF and AIEE effects …”

Section: Introductionmentioning

confidence: 99%

“…Therefore, thesed erivatives have to be carefullyd esigned forgetting both TADF and AIEE effects. [27] In this work, aimingt odesign derivatives of 9-phenyl-9H-carbazole with both TADF and AIEE properties, new derivatives of trifluoromethyl-substituted benzonitrile and carbazole having differents ubstituents at the 2,7-or 3,6-positions were designed and synthesized. Applying different theoreticala nd experimental methods, both TADF and AIEE effects were demonstrated for the synthesized derivatives.…”

Section: Introductionmentioning

confidence: 99%

Aggregation‐Enhanced Emission and Thermally Activated Delayed Fluorescence of Derivatives of 9‐Phenyl‐9H‐Carbazole: Effects of Methoxy and tert‐Butyl Substituents

Grybauskaite-Kaminskiene

Volyniuk

Mimaitė

et al. 2018

Chemistry A European J

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Derivatives of 9-phenyl-9H-carbazole were synthesized as efficient emitters exhibiting both thermally activated delayed fluorescence and aggregation-induced emission enhancement. Effects of methoxy and tert-butyl substituents at the different positions of carbazolyl groups on the properties of the emitters were studied. Depending on the substitutions, photoluminescence quantum yields (PLQY) of non-doped solid films of the compounds ranged from 17 % to 53 % which were much higher than those observed for the solutions in low-polarity solvent toluene. Compounds substituted at C-3 and C-6 positions of carbazole moiety by methoxy- and tert-butyl- groups showed the highest solid-state PLQY. Ionization potentials of the studied derivatives in solid-state were found to be in the short range of 5.75-5.89 eV. Well-balanced hole and electron mobilities were detected for tert-butyl-substituted compound. They exceeded 10 cm (V×s) at electric fields higher than 3×10 V cm . Two compounds with the highest solid-state PLQYs showed higher efficiencies in non-doped organic light-emitting diodes than in the doped devices. Maximum external quantum efficiency of 7.2 % and brightness of 15000 cd m were observed for the best device.

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OLEDs based on the emission of interface and bulk exciplexes formed by cyano-substituted carbazole derivative

Cited by 45 publications

References 51 publications

Tricomponent Exciplex Emitter Realizing over 20% External Quantum Efficiency in Organic Light‐Emitting Diode with Multiple Reverse Intersystem Crossing Channels

Tricomponent Exciplex Emitter Realizing over 20% External Quantum Efficiency in Organic Light‐Emitting Diode with Multiple Reverse Intersystem Crossing Channels

Exciplex emissions derived from exceptionally long-distance donor and acceptor molecules

Aggregation‐Enhanced Emission and Thermally Activated Delayed Fluorescence of Derivatives of 9‐Phenyl‐9H‐Carbazole: Effects of Methoxy and tert‐Butyl Substituents

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