Blue and white solution-processed TADF-OLEDs with over 20% EQE, low driving voltages and moderate efficiency decrease based on interfacial exciplex hosts

He, Zhihua; Wang, Chenyu; Zhao, Juewen; Du, Xiaoyang; Yang, Haoyu; Zhong, Ping-Li; Zheng, Caijun; Lin, Hui; Zhang, Xiaohong

doi:10.1039/c9tc03468d

Cited by 55 publications

(31 citation statements)

References 44 publications

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“…The T‐P hybrid WOLEDs fabricated by solution‐processing has also attracted much attraction in recent years. [ 54,56,164,165 ] The detailed EL characteristics of the solution‐processed SEL‐WOLEDs are summarized in Table 3. In 2018, Wu and Chen reported the first solution‐processed T‐P hybrid WOLED with a quaternary SEL of 26DCzPPy:TCTA:DMAC‐TRZ:Ir(dpm)PQ 2 .…”

Section: Multiple‐molecule Sel‐woledsmentioning

confidence: 99%

“…Except for the traditional thermal evaporation for the film deposition, the solution process is one of the effective methods to produce SEL‐WOLEDs due to the reduced architecture complexity and the dissolving risk. [ 54–56 ] The device structure excavated in the thermal evaporation process can, therefore, be well transferred to the solution process. However, at present, the poor stability of the solution‐processed devices is still a big problem due to the moisture/oxygen‐induced degradation, the solution‐processed film quality, and inadequate stability of the solvable material itself.…”

Section: Introductionmentioning

confidence: 99%

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The Strategies for High‐Performance Single‐Emissive‐Layer White Organic Light‐Emitting Diodes

Zou

Zeng

et al. 2021

Laser & Photonics Reviews

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White organic light‐emitting diodes (WOLEDs) have been regarded as the most promising candidate for full‐color display and solid‐state lighting applications owing to their favorable merits of high efficiency, superior white color balance, simple fabrication, and large‐area manufacturing possibility. Particularly, single‐emissive‐layer WOLEDs (SEL‐WOLEDs) with the reduced structural complexity, lower process cost, and feasible solution processing have drawn particular attentions. Numerous strategies have been proposed in recent years to construct SEL‐WOLEDs with improved device performance. This review focuses on the aspects, including: a) the molecular design methods for achieving a single‐molecule WOLED; b) the energy transfer mechanisms in various multiple‐molecule SEL‐WOLEDs with all‐fluorescence, all‐phosphorescence, and fluorescence‐phosphorescence hybrid structures; c) the combination of exciplex emitters and complementary fluorescent/thermally‐activated delayed fluorescent/phosphorescent emitters to realize SEL‐WOLEDs. Some future prospects on new opportunities and technological challenges in SEL‐WOLEDs are also covered.

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Section: Multiple‐molecule Sel‐woledsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Strategies for High‐Performance Single‐Emissive‐Layer White Organic Light‐Emitting Diodes

Zou

Zeng

et al. 2021

Laser & Photonics Reviews

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“…And exciplex host based OLEDs normally exhibit good device performance because exciplex host has the advantages of bipolar charge transporting, wide exciton recombination zone and barrier free from hole transporting layer (HTL) and electron transporting layer (ETL) to the emitting layer (EML). [23][24][25][26][27][28][29] In this work, we designed and synthesized a novel D-A type electron donor (9-(4-(diphenylamino)phenyl)-9H-fluoren-9-yl)diphenylphosphine oxide (TPAFPO) with proper HOMO, LUMO and T 1 . Triphenylamine group with good electron donating ability was selected and diphenylphosphine oxide was selected to enhancing the electron donating ability.…”

Section: Introductionmentioning

confidence: 99%

Efficient Exciplex‐based Green and Near‐Infrared Organic Light‐Emitting Diodes Employing a Novel Donor‐Acceptor Type Donor

Zhao

Ye²,

et al. 2020

Chemistry An Asian Journal

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Widely investigated thermally activated delayed fluorescence (TADF) can be achieved by intramolecular and intermolecular charge transfer between an electron donor and electron acceptor which corresponds to a TADF material and exciplex, respectively. However, the development of efficient organic light-emitting diodes (OLEDs) based on an exciplex lags far behind the development of those based on efficient TADF materials. In this work, a novel D-A type electron donor TPAFPO was designed and synthesized. TPAFPO:PO-T2T exhibits a small ΔE ST of 79 meV and significant delayed emission, demonstrating TADF characteristics. OLEDs based on TPAFPO:PO-T2T exhibit a low turn-on voltage of 2.4 V and high an EQE value of 17.0%. Besides, NIR OLEDs utilizing TPAFPO:PO-T2T as host exhibit a turn-on voltage of 3.0 V and high EQE of 9.2% with a NIR emission peak at 690 nm. Furthermore, solution-processed exciplex and NIR devices also can maintain high efficiencies of 15.1% and 8.1%, respectively.

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“…37 We reasoned that incorporation of a pyrene or perylene moiety into a PLA matrix would prevent π−π stacking and that these fluorophores would therefore behave as in dilute solution and exhibit their usual emissive properties. 38,39 In a novel departure we report the fabrication and evaluation of an organic LED (OLED) device using solution processing techniques [40][41][42][43] which utilises PLA as the supporting matrix. In this study we find that the incorporation of perylene residues (AH11) as fluorophore within the PLA matrix generates material suitable for OLED fabrication.…”

Section: Introductionmentioning

confidence: 99%

“…In a novel departure we report the fabrication and evaluation of an organic LED (OLED) device using solution processing techniques 40–43 which utilises PLA as the supporting matrix. In this study we find that the incorporation of perylene residues ( AH11 ) as fluorophore within the PLA matrix generates material suitable for OLED fabrication.…”

Section: Introductionmentioning

confidence: 99%

Polylactide‐perylene derivative for blue biodegradable organic light‐emitting diodes

Al-Attar

Alwattar

Haddad

et al. 2020

Polymer International

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In this work we demonstrate, for the first time, the use of polylactic acid (PLA) as a biodegradable host matrix for the construction of the active emissive layer of organic light-emitting diode (OLED) devices for potential use in bioelectronics. In this preliminary study, we report a robust synthesis of two fluorescent PLA derivatives, pyrene-PLA (AH10) and perylene-PLA (AH11). These materials were prepared by the ring opening polymerisation of L-lactide with hydroxyalkyl-pyrene and hydroxyalkyl-perylene derivatives using 1,8-diazabicyclo[5.4.0]undec-7-ene as catalyst. OLEDs were fabricated from these materials using a simple device architecture involving a solution-processed single-emitting layer in the configuration ITO/PEDOT:PSS/PVK:OXD-7 (35%):AH10 or AH11 (20%)/TPBi/LiF/Al (ITO, indium tin oxide; PEDOT:PSS, poly(3,4-ethylenedioxythiophene) doped with poly (styrenesulfonic acid); PVK, poly(vinylcarbazole); OXD-7, (1,3-phenylene)-bis-[5-(4-tert-butylphenyl)-1,3,4-oxadiazole]; TPBi, 2,2 0 ,2 00-(1,3,5-benzenetriyl)tris(1-phenyl-1H-benzimidazole)). The turn-on voltage for the perylene OLED at 10 cd m-2 was around 6 V with a maximum brightness of 1200 cd m-2 at 13 V. The corresponding external quantum efficiency and device current efficiency were 1.5% and 2.8 cd A-1 respectively. In summary, this study provides proof of principle that OLEDs can be constructed from PLA, a readily available and renewable bio-source.

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Blue and white solution-processed TADF-OLEDs with over 20% EQE, low driving voltages and moderate efficiency decrease based on interfacial exciplex hosts

Abstract: Blue and white solution-processed OLEDs with low driving voltages, over 20% maximum external quantum efficiency and moderate efficiency decrease were realized by using interfacial exciplex hosts.

Cited by 55 publications

References 44 publications

The Strategies for High‐Performance Single‐Emissive‐Layer White Organic Light‐Emitting Diodes

The Strategies for High‐Performance Single‐Emissive‐Layer White Organic Light‐Emitting Diodes

Efficient Exciplex‐based Green and Near‐Infrared Organic Light‐Emitting Diodes Employing a Novel Donor‐Acceptor Type Donor

Polylactide‐perylene derivative for blue biodegradable organic light‐emitting diodes

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