Polycyclic Aromatic Hydrocarbon Derivatives toward Ideal Electron-Transporting Materials for Organic Light-Emitting Diodes

Zhang, Dongdong; Duan, Lian

doi:10.1021/acs.jpclett.9b00526

Cited by 32 publications

(16 citation statements)

References 54 publications

(115 reference statements)

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“…Also, the side group greatly influences the charge injection and exciton confinement abilities of such ETMs. In the authors' previous work, it was mentioned that an asymmetric anthracene derivative motif would be an ideal molecular design strategy to balance all the parameters [4]. In the present study, based on such concept, a novel asymmetric anthracene derivative was designed and synthesized to further improve the performances of such compounds as ETMs.…”

Section: Introductionmentioning

confidence: 98%

A novel anthracene derivative with an asymmetric structure as an electron transport material for stable Rec. 2020 blue organic light-emitting diodes

Liu

Zhang

Duan

2020

Journal of Information Display

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The stability of blue organic light-emitting diodes (OLEDs) is highly restricted by both the low electron transport mobility and the stability of the electron transport materials (ETMs). Anthracenederivative-type ETMs have been proven to be potential materials for solving the aforementioned problem, but their performance still needs to be improved. In this study, a novel anthracene derivative with an asymmetric structure was developed as an ETM in deep-blue devices, realizing a 10.41 cd/A current efficiency, a low driving voltage of 4.04 V, (0.139, 0.047) Rec. 2020 CIE coordinates, and a long T 99 lifetime of over 100 h at the 20 mA/cm 2 current density. Single-crystal diffraction showed that ET-01 has a face-to-face π-π stack, which is the reason for its good performance. Notably, when the lithium quinolate (Liq) doping ratio was further tuned, one of the devices showed no obvious degradation after 140 h of continuous operation at 20 mA/cm 2 , representing the champion data in the scientific literature.

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Section: Introductionmentioning

confidence: 98%

A novel anthracene derivative with an asymmetric structure as an electron transport material for stable Rec. 2020 blue organic light-emitting diodes

Liu

Zhang

Duan

2020

Journal of Information Display

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“…[ 41,42 ] In our case, a better electron mobility feature in these materials would arise from the peripheral electron‐withdrawing cyano substituent. [ 43 ] Considering that both electron/hole motilities of TPNACN were slightly higher than TPBACN , which likely benefits from its π–π stacking and strongly interacting solid‐state structure, facilitating charge hopping between the adjacent molecules and thus enhanced charge mobility. [ 44 ] Thus, the superior EL performance of TPNACN ‐based OLED could be attributed to a combination of a close to unity solid‐state Φ PL and a good charge transporting ability of the emitter as well as an improved TTA process in the device, in which all these properties are initiated from a distinctive isolated dimeric π‐stacking of anthracene unit of the molecule in solid‐state.…”

Section: Resultsmentioning

confidence: 99%

A Dimeric π‐Stacking of Anthracene Inducing Efficiency Enhancement in Solid‐State Fluorescence and Non‐Doped Deep‐Blue Triplet–Triplet Annihilation Organic Light‐Emitting Diodes

Nalaoh

Sungworawongpana

Chasing

et al. 2021

Advanced Optical Materials

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Triplet–triplet annihilation (TTA) mechanism utilizing the conversion of low triplet energy excitons to generate singlet excitons has been successfully employed in realizing highly efficient fluorescent organic light‐emitting diodes (OLEDs). Herein, new anthracene‐based TTA molecules (TPNACN and TPBACN) are developed as deep‐blue emitters for high‐efficiency non‐doped TTA‐OLEDs. Their structural, physical, and photophysical properties are experimentally and theoretically investigated. These compounds in solid‐state exhibit different photophysical properties due to a discrepancy in the molecular packing. Particularly, in the crystal of TPNACN, anthracene moieties are arranged with dimeric π–π stacking, and the material shows a strong excimer emission in the deep‐blue region with ΦPL close to the ideal theoretical value. The non‐doped TTA‐OLED based on TPNACN attains a high maximum external quantum efficiency of 7.89% (6.63 cd A−1) with a low turn‐on voltage of 2.6 V, and displays deep‐blue emission with CIE coordinates of (0.146, 0.101). These results prove that a separated dimeric π‐stacked molecular alignment of anthracene enhances not only the fluorescence efficiency in the solid state but also the ratio of singlet exciton harvested by the TTA process in the device, bringing about excellent device electroluminescent properties. This can be a new tactic to designing new emissive materials for efficient OLED devices.

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“…Electron transfer in organic molecules is essential for the functioning of organic electronic devices, such as secondary batteries, [1,2] electrochromic devices, [3] non‐volatile semiconductor memory, and [4–6] organic light‐emitting diodes (OLEDs) [7] . The kinetics and reversibility of electron transfer are key aspects for the optimal performance and sustainability of these systems.…”

Section: Introductionmentioning

confidence: 99%

Multi‐Redox Active Carbons and Hydrocarbons: Control of their Redox Properties and Potential Applications

Ueda

2021

The Chemical Record

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Precise control over redox properties is essential for high‐performance organic electronic devices such as organic batteries, electrochromic devices, and information storage devices. In this context, multi‐redox active carbons and hydrocarbons, represented as CxHy molecules (x≥1, y≥0), are highly sought after, because they can switch between multiple redox states. Herein, we outline the redox properties of CxHy molecules as solutes and adsorbed species. Furthermore, the limitations of evaluating their redox properties and the possible solutions are summarized. Additionally, the theoretical capacity (mAh/g) and gravimetric energy density (Wh/kg) of secondary batteries were estimated based on the redox properties of 185 CxHy molecules, which have primarily been reported in the last decade. Among them, seven CxHy molecules were found to have the potential to surpass the energy density of LiNi0.6Mn0.2Co0.2O2/graphite batteries. The use of CxHy molecules in multielectrochromic devices and multi‐bit memory is also explained. We believe that this review will encourage further utilization of CxHy molecules thereby promoting its applications in organic electronic devices.

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Polycyclic Aromatic Hydrocarbon Derivatives toward Ideal Electron-Transporting Materials for Organic Light-Emitting Diodes

Cited by 32 publications

References 54 publications

A novel anthracene derivative with an asymmetric structure as an electron transport material for stable Rec. 2020 blue organic light-emitting diodes

A novel anthracene derivative with an asymmetric structure as an electron transport material for stable Rec. 2020 blue organic light-emitting diodes

A Dimeric π‐Stacking of Anthracene Inducing Efficiency Enhancement in Solid‐State Fluorescence and Non‐Doped Deep‐Blue Triplet–Triplet Annihilation Organic Light‐Emitting Diodes

Multi‐Redox Active Carbons and Hydrocarbons: Control of their Redox Properties and Potential Applications

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