Improving Electron Mobility of Tetraphenylethene-Based AIEgens to Fabricate Nondoped Organic Light-Emitting Diodes with Remarkably High Luminance and Efficiency

Lin, Gengwei; Peng, Huiren; Chen, Long; Nie, Han; Luo, Wenwen; Li, Yinghao; Chen, Shuming; Hu, Rongrong; Qin, Anjun; Zhao, Zujin; Tang, Ben Zhong

doi:10.1021/acsami.6b04924

Cited by 82 publications

(34 citation statements)

References 55 publications

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“…Inorganic metal‐oxide semiconductors possess high carrier mobility, and great chemical stability, making them better candidates for PeLEDs than their organic counterparts. Zinc oxide nanoparticle (ZnO NP) is an inorganic metal‐oxide material with better electron mobility (≈2 × 10 −3 cm 2 V −1 s −1 ) than that of TPBi (≈5 × 10 −5 cm 2 V −1 s −1 ), and is more chemically stable than TPBi, which can facilitate electron transport in the EIL and improve device stability for practical applications . Thus, ZnO NPs should work as a better EIL in PeLEDs.…”

Section: Device Performances Of Pure Fapbbr3‐based Peleds With Diffmentioning

confidence: 99%

All‐Solution‐Processed Pure Formamidinium‐Based Perovskite Light‐Emitting Diodes

Wang

Song

et al. 2018

Advanced Materials

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All-solution-processed pure formamidinium-based perovskite light-emitting diodes (PeLEDs) with record performance are successfully realized. It is found that the FAPbBr device is hole dominant. To achieve charge carrier balance, on the anode side, PEDOT:PSS 8000 is employed as the hole injection layer, replacing PEDOT:PSS 4083 to suppress the hole current. On the cathode side, the solution-processed ZnO nanoparticle (NP) is used as the electron injection layer in regular PeLEDs to improve the electron current. With the smallest ZnO NPs (2.9 nm) as electron injection layer (EIL), the solution-processed PeLED exhibits a highest forward viewing power efficiency of 22.3 lm W , a peak current efficiency of 21.3 cd A , and an external quantum efficiency of 4.66%. The maximum brightness reaches a record 1.09 × 10 cd m . A record lifetime T of 436 s is achieved at the initial brightness of 10 000 cd m . Not only do PEDOT:PSS 8000 HIL and ZnO NPs EIL modulate the injected charge carriers to reach charge balance, but also they prevent the exciton quenching at the interface between the charge injection layer and the light emission layer. The subbandgap turn-on voltage is attributed to Auger-assisted energy up-conversion process.

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Section: Device Performances Of Pure Fapbbr3‐based Peleds With Diffmentioning

confidence: 99%

All‐Solution‐Processed Pure Formamidinium‐Based Perovskite Light‐Emitting Diodes

Wang

Song

et al. 2018

Advanced Materials

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“…At low voltages, the curves show prominent ohmic characteristics, while upon the increase of voltage, the currents become space‐charge limited. The SCLC property can be described via the Mott‐Gurney equation (1), and the carrier mobility (μ) of organic semiconductors can be calculated according to the following Equation (2) (Poole–Frenkel formula) [ 27,28 ]

J = \frac{9}{8} ε_{0} ε_{r} μ \frac{E^{2}}{L} = \frac{9}{8} ε_{0} ε_{r} \frac{V^{2}}{L^{3}} μ_{0} exp (0.891 γ \sqrt{\frac{V}{L}})

μ = μ_{0} exp (γ \sqrt{E})

where ε 0 is the vacuum permittivity (ε 0 = 8.85 × 10 −14 C V −1 cm −1 ), ε r is the relative dielectric constant (supposed to be 3.0 for organic semiconductor), E stands for strength of electric field, L is the thickness of SBF‐BP‐DMAC neat film, μ 0 is the zero‐field mobility, and γ is the Poole‐Frenkel factor. In devices H1 and E1, thin layers (10 nm) of TAPC (hole mobility μ h ≈ 10 −2 cm 2 V −1 s −1 ) [ 29 ] and TmPyPB (electron mobility μ e ≈ 10 −3 cm 2 V −1 s −1 ) [ 30 ] were used as buffer layers between SBF‐BP‐DMAC and the electrodes.…”

Section: Resultsmentioning

confidence: 99%

A Multifunctional Bipolar Luminogen with Delayed Fluorescence for High‐Performance Monochromatic and Color‐Stable Warm‐White OLEDs

Zeng

Guo

Líu

et al. 2020

Adv Funct Materials

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(1 of 11)Increasing exciton utilization and reducing exciton annihilation are crucial to achieve high performance of organic light-emitting diodes (OLEDs), which greatly depend on molecular engineering of emitters and hosts. A novel luminogen (SBF-BP-DMAC) is synthesized and characterized. Its crystal and electronic structures, thermal stability, electrochemical behavior, carrier transport, photoluminescence, and electroluminescence are investigated. SBF-BP-DMAC exhibits enhanced photoluminescence and promotes delayed fluorescence in solid state and bipolar carrier transport ability, and thus holds multifunctionality of emitter and host for OLEDs. Using SBF-BP-DMAC as an emitter, the nondoped OLEDs exhibit maximum electroluminescence (EL) efficiencies of 67.2 cd A −1 , 65.9 lm W −1 , and 20.1%, and the doped OLEDs provide maximum EL efficiencies of 79.1 cd A −1 , 70.7 lm W −1 , and 24.5%. A representative orange phosphor, Ir(tptpy) 2 acac, is doped into SBF-BP-DMAC for OLED fabrication, giving rise to superior EL efficiencies of 88.0 cd A −1 , 108.0 lm W −1 , and 26.8% for orange phosphorescent OLEDs, and forwardviewing EL efficiencies of 69.3 cd A −1 , 45.8 lm W −1 , and 21.0% for two-color hybrid warm-white OLEDs. All of these OLEDs can retain high EL efficiencies at high luminance, with very small efficiency roll-offs. The outstanding EL performance demonstrates the great potentials of SBF-BP-DMAC in practical display and lighting devices.luminous efficiencies and efficient exciton utilization approaching 100%. [2] However, commercial phosphors depend on rare metal elements such as iridium and platinum, and thus are usually expensive. What is more, high doping concentrations (5-20 wt%) of phosphors were recently reported to optimize the device performance, leading to a high manufacturing cost. [3] As promising alternatives, Adachi and co-workers developed purely organic luminescent materials with thermally activated delayed fluorescence (TADF), which can fully utilize the electrogenerated excitons in OLEDs and thus afford excellent external quantum efficiencies (ƞ ext ) of >20% via reverse intersystem crossing (RISC) process based on small singlet-triplet energy gaps (ΔE ST ≤ 0.3 eV) of the molecules. [4] However, on account of the long triplet lifetimes, most phosphors and TADF emitters suffer from negative nonradiative processes in OLEDs, such as aggregation and concentration caused quenching, [5] triplet-triplet annihilation (TTA), [6] singlet-triplet annihilation (STA), [7] and so on, [8] which greatly limits their practical applications. To address the issue, robust luminogens that can alleviate emission quenching and exciton annihilation are extremely desired. According to the previous works, reducing the intermolecular interactions (e.g., π-π interactions) has been evidenced to be an effective strategy to develop efficient luminescent materials with high photoluminescence quantum yields (Φ F s) in neat films and prominent delayed fluorescence. [9] By this way, the emitters are usually insensitive ...

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“…Bipolar materials with an electronic donor−acceptor (D‐A) structure are considered to be in favour of injecting and transporting both holes and electrons according to recent studies . Two linear TPE derivatives modified with hole‐transporting triphenylamine (TPA) and electron‐transporting phenylbenzimidazole (PBI) groups have been recently reported and used as emitters in green AIE‐OLEDs . The device made using the D‐A structure showed ultrahigh luminance of up to 125300 cd/m 2 , and affords outstanding EL efficiencies of 5.8 %, 14.6 lm/W and 16.8 cd/A, which are much superior to that of the device employing only the PBI‐modified TPE emitter.…”

Section: Recent Aiegens Emitters For Non‐doped Oledsmentioning

confidence: 99%

Recent Developments in AIEgens for Non‐doped and TADF OLEDs

Rizzo

Cucinotta

2018

Israel Journal of Chemistry

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The design of innovative and more efficient Aggregation‐Induced Emission (AIE) chromophores has kept a very high scientific interest since the first report on 2001. Among the possible applications, the field of the organic electroluminescent diodes (OLEDs) is highly attractive. This review will focus on very recent development in the design of AIE molecules for OLEDs, with particular attention on the performance of different emitting devices. Another key point is the description of the new class of AIE luminogens showing Thermally Activated Delayed Fluorescence (TADF), which appears as possible solution to overcome the limitation of fluorescent dyes employed in electroluminescent devices.

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Improving Electron Mobility of Tetraphenylethene-Based AIEgens to Fabricate Nondoped Organic Light-Emitting Diodes with Remarkably High Luminance and Efficiency

Cited by 82 publications

References 55 publications

All‐Solution‐Processed Pure Formamidinium‐Based Perovskite Light‐Emitting Diodes

All‐Solution‐Processed Pure Formamidinium‐Based Perovskite Light‐Emitting Diodes

A Multifunctional Bipolar Luminogen with Delayed Fluorescence for High‐Performance Monochromatic and Color‐Stable Warm‐White OLEDs

Recent Developments in AIEgens for Non‐doped and TADF OLEDs

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