A terpyridine-modified chrysene derivative as an electron transporter to improve the lifetime in phosphorescent OLEDs

Owada, Tsukasa; Sasabe, Hiroyuki; Sukegawa, Yoshihito; Watanabe, Taiki; Maruyama, Tomohiro; Watanabe, Yuichiro; Yokoyama, Daisuke; Kido, Junji

doi:10.1039/c9tc06393e

Cited by 4 publications

(4 citation statements)

References 28 publications

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“…The performance of OLED devices is also greatly influenced by the appropriate choice of electron-transporting materials because they play a very crucial role in balancing the charge carrier in the recombination zone and reducing the electron injection barrier between the cathode and the active layer. , In all the aforementioned designed OLED device structures, the most widely used benzimidazole-based electron-transporting and hole-blocking material TPBi has been employed as an ETL layer. In order to further improve the performance of the OLED device, a phosphine oxide-based electron deficient molecule PO-T2T , has been used as the electron-transporting material over TPBi.…”

Section: Resultsmentioning

confidence: 99%

“…11,32,33 It is scientifically evidenced that the performance of OLED devices is strongly linked to the photophysical, electrochemical, electronic, and charge transport properties of not only the emissive layer but also the adjacent charge transport and injection layers. 34,35 The level of electron affinity (EA) and ionization potential (IP) of the adjacent charge transporting/ injecting layers with respect to the work function of the cathode and anode, respectively, control the charge injection and hence the performance of the OLED device. 36 A large hole or electron injection barrier at the anode or cathode leads to poor device performance.…”

Section: Introductionmentioning

confidence: 99%

“…The latter solution seems to be the most promising approach, and several electron-injecting and transporting materials have been developed in the past. The high electron mobility, high ionization potential, low electron affinity, high triplet energy, and high glass-transition temperatures are a few of the most important features of an efficient electron-transporting material. − …”

Section: Introductionmentioning

confidence: 99%

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High-Throughput Virtual Screening of Host Materials and Rational Device Engineering for Highly Efficient Solution-Processed Organic Light-Emitting Diodes

Dubey

Thakur

Yadav

et al. 2021

ACS Appl. Mater. Interfaces

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The appropriate choice of host and electron-transporting material (ETM) plays a very crucial role in the generation and collection of radiative excitons in the desired recombination zone of organic light-emitting diodes (OLEDs). Due to the sustainable development of material organic chemistry, there is a big library of functional materials that leads to uncountable combinations of device structures, which might achieve a desirable high device performance. However, there is no appropriate methodology available for the fast virtual screening of organic materials and designing a suitable device structure. Here, we have used the electrical software package SETFOS 4.5 for high-throughput virtual screening of host materials and developed a highly efficient multistack OLED device structure. To further enhance the device performance, a co-host approach has been used, and the final device structure has also been optimized with two different ETMs. The best-optimized Ir(ppy)3-based solution-processed green OLED device exhibited a maximum power efficiency (PE) of 83.20 lm/W and brightness of 61,362 cd/m2 with a driving voltage of 2.1 V without using any light extraction outcoupling techniques, which is the best among the OLEDs in its own category. The developed device structure has also been utilized to fabricate highly efficient blue hazard-free low-color temperature OLEDs for a physiologically friendly light at night. The resultant 2083 K OLED device displayed a maximum PE of 51.4 lm/W and luminance of 44,548 cd/m2 with a turn-on voltage of 2.1 V that is also 42 and 104 times safer in terms of retinal protection and ∼4 and ∼11 times safer in terms of melatonin generation when compared with those of a real candle and incandescent bulb, respectively. The observed excellent device performance may be attributed to the balanced charge carrier in the recombination zone, broader emissive layer due to a mixed-host system, less accumulation of charges at the injecting surfaces, well-aligned triplet energy and molecular orbital energy level of the host and guest, and high electron mobility and enhanced hole blocking ability of the employed ETM in the designed OLED device structure.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High-Throughput Virtual Screening of Host Materials and Rational Device Engineering for Highly Efficient Solution-Processed Organic Light-Emitting Diodes

Dubey

Thakur

Yadav

et al. 2021

ACS Appl. Mater. Interfaces

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“…Therefore, in addition to using stable emitters and functional materials, the design of device structure, in which TTA and TPA processes are minimized, plays a pivotal role in realizing long-term stable OLEDs. Since TTA and TPA processes in a PhOLED are pronounced at conditions of high exciton density and high driving voltage, the adoption of a device structure with a wider exciton recombination zone (ERZ) and lower driving voltage has been demonstrated to be an effective method to improve LT of PhOLEDs [ 22 , 23 , 24 , 25 ]. Pin-structure OLEDs, whose hole-transporting layer (HTL) was doped with 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane and electron transporting layer (ETL) was doped with Cs, were designed and realized by Leo and co-workers [ 26 , 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

Improved Efficiency Roll-Off and Operational Lifetime of Organic Light-Emitting Diodes with a Tetradentate Platinum(II) Complex by Using an n-Doped Electron-Transporting Layer

et al. 2021

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The efficiency roll-off and operational lifetime of organic light-emitting diodes (OLEDs) with a tetradentate Pt(II) emitter is improved by engaging an n-doped electron-transporting layer (ETL). Compared to those devices with non-doped ETL, the driving voltage is lowered, the charged carrier is balanced, and the exciton density in the emissive layer (EML) is decreased in the device with n-doped ETL with 8-hydroxyquinolinolatolithium (Liq). High luminance of almost 70,000 cd m−2 and high current efficiency of 40.5 cd A−1 at high luminance of 10,000 cd m−2 is achieved in the device with 50 wt%-Liq-doped ETL. More importantly, the extended operational lifetime of 1945 h is recorded at the initial luminance of 1000 cd m−2 in the 50 wt%-Liq-doped device, which is longer than that of the device with non-doped ETL by almost 10 times. This result manifests the potential application of tetradentate Pt(II) complexes in the OLED industry.

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Theoretical exploration of the electronic structure and photophysical properties of five cyclometalated Ir(III) complexes bearing different substituted acetylacetone moieties

et al. 2023

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A terpyridine-modified chrysene derivative as an electron transporter to improve the lifetime in phosphorescent OLEDs

Abstract: A terpyridine-end-capped chrysene shows superior electron-transport ability with high operation stability in organic light-emitting devices. A green phosphorescent device exhibited a long operation lifetime of 19 000 h at 1000 cd m−2.

Cited by 4 publications

References 28 publications

High-Throughput Virtual Screening of Host Materials and Rational Device Engineering for Highly Efficient Solution-Processed Organic Light-Emitting Diodes

High-Throughput Virtual Screening of Host Materials and Rational Device Engineering for Highly Efficient Solution-Processed Organic Light-Emitting Diodes

Improved Efficiency Roll-Off and Operational Lifetime of Organic Light-Emitting Diodes with a Tetradentate Platinum(II) Complex by Using an n-Doped Electron-Transporting Layer

Theoretical exploration of the electronic structure and photophysical properties of five cyclometalated Ir(III) complexes bearing different substituted acetylacetone moieties

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