Tetrapyridine/triphenyltriazine-conjugated electron transporters for low-power-consumption, high-stability phosphorescent OLEDs

Kawano, Tomoya; Sasabe, Hiroyuki; Saito, Yasuhito; Chen, Yuhui; Kori, Yuma; Nakamura, Takeru; Abe, Shigeki; Maruyama, Tomohiro; Kido, Junji

doi:10.1039/d2tc04647d

J. Mater. Chem. C

2023

DOI: 10.1039/d2tc04647d

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Tetrapyridine/triphenyltriazine-conjugated electron transporters for low-power-consumption, high-stability phosphorescent OLEDs

Tomoya Kawano

Hiroyuki Sasabe

Yasuhito Saito

et al.

Abstract: A series of tetrapyridine/triazine-conjugated electron transporters, TnPyTRZ, was developed. T3PyTRZ realized a turn-on voltage of 2.18 V, power efficiency of over 115 lm W−1, and lifetime of 30 000 h at 1000 cd m−2 in green phosphorescent OLED.

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Cited by 10 publications

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“…Figure 1 illustrates the molecular structures of the three materials used in the emitting layer and the spectral overlap between the materials. The host material chosen was 2,4-diphenyl-6-bis (12-phenylindolo) [2, 3-a] carbazole-11-yl)−1, 3, 5-triazine (DIC-TRZ) 23,24) known for its ambipolar carrier-transport properties and a small energy gap between the singlet and triplet excited states. Tris [1-phenylisoquinolinato-C 2 ,N]iridium(III) (Ir(piq) 3 ), [25][26][27] served as the assistant dopant.…”

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confidence: 99%

Near-infrared phosphorescent OLEDs exhibiting over 10% external quantum efficiency and extremely long lifetime using resonant energy transfer with a phosphorescent assist dopant

Hanayama,

Sano,

Saito

et al. 2024

Appl. Phys. Express

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We have introduced a three-component light-emitting layer consisting of a host, a phosphorescent assist dopant, and a phosphorescent emitter to simultaneously realize high efficiency and long lifetime in near-infrared organic light-emitting diodes. An efficient energy transfer between the two phosphorescent materials was observed with 1 wt% doping ratio of the near-infrared emitter, significantly enhancing the external quantum efficiency reaching 10.5% with an emission peak at 769 nm. The device showed a low drive voltage and a long operational lifetime, with a luminance decay of less than 11% from the initial value after 4800 hours under accelerated conditions of 100 mA/cm2.

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mentioning

confidence: 99%

Near-infrared phosphorescent OLEDs exhibiting over 10% external quantum efficiency and extremely long lifetime using resonant energy transfer with a phosphorescent assist dopant

Hanayama,

Sano,

Saito

et al. 2024

Appl. Phys. Express

Self Cite

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A Novel Matrix‐Free Hyperfluorescent System Based on Anti‐Quenching TADF Host for High Color Purity MR‐TADF Emitters

Jiang,

Sasabe,

Chen

et al. 2024

Advanced Materials

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Organic light‐emitting diodes (OLEDs) based on hyperfluorescent system have attracted widespread attention due to their ability to simultaneously achieve improvements in efficiency, lifetime, and color purity by combining the advantages of high exciton utilization sensitizers and high‐color purity emitters. Traditional hyperfluorescent systems typically involve three or four components and are severely sensitive to the doping concentration (≈0.5 wt%) of a terminal emitter, which inevitably causes high costs and difficulties in reproducibility. Here, a novel design concept for a matrix‐free hyperfluorescent (MFHF) system that employs a combination of an anti‐quenching TADF host and a high color purity MR‐TADF emitter is proposed. This strategy allows traditional concentration‐sensitive MR‐TADF emitters to significantly improve exciton utilization and reduce exciton lifetime at high doping levels, without the need for complex molecular modifications. The OLEDs with binary emissive layer achieve pure‐green emission, a maximum external quantum efficiency of over 30%, and a high maximum power efficiency of 145 lm W−1. The approach offers a straightforward and universal method to achieve anti‐quenching matrix‐free hyperfluorescent OLEDs with high color purity, making them promising for commercial applications in low‐cost ultra‐high‐definition (UHD) displays.

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π‐Extended Phenoxazine‐Based Asymmetric MR‐TADF Emitters for Narrow Emission Band Green OLEDs with a Power Efficiency of 150 lm W⁻¹, an EQE of 27%, and an LT₉₅ of Over 3000 h at 1000 cdm⁻²

Nemma,

Kori,

Meguro

et al. 2024

Advanced Optical Materials

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Although multi‐resonance thermally activated delayed fluorescent (MR‐TADF) emitters simultaneously achieve high color purity and high efficiency in organic light‐emitting devices (OLEDs), MR‐TADF‐based OLEDs suffer from severe efficiency roll‐off and lifetime issues for practical application. To overcome these issues, a key solution is hyper OLED technology sensitized by TADF or phosphorescent emitters. In this study, a series of π‐extended phenoxazine‐based asymmetric MR‐TADF emitters for long lifetime, low‐power consumption, and narrow emission band green OLEDs is developed. As a sensitizer, a well‐known phosphorescent emitter is used, fac‐tris(2‐phenylpyridinato‐C2,N)iridium(III) [Ir(ppy)3]. Consequently, these MR‐TADF emitters achieve hyper OLEDs with a power efficiency of 150 lmW−1, an external quantum efficiency of 27%, and a long lifetime LT95 of over 3000 h at high brightness of 1000 cdm−2. These performances are among the best in scientific literature.

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Tetrapyridine/triphenyltriazine-conjugated electron transporters for low-power-consumption, high-stability phosphorescent OLEDs

Abstract: A series of tetrapyridine/triazine-conjugated electron transporters, TnPyTRZ, was developed. T3PyTRZ realized a turn-on voltage of 2.18 V, power efficiency of over 115 lm W−1, and lifetime of 30 000 h at 1000 cd m−2 in green phosphorescent OLED.

Cited by 10 publications

References 48 publications

Near-infrared phosphorescent OLEDs exhibiting over 10% external quantum efficiency and extremely long lifetime using resonant energy transfer with a phosphorescent assist dopant

Near-infrared phosphorescent OLEDs exhibiting over 10% external quantum efficiency and extremely long lifetime using resonant energy transfer with a phosphorescent assist dopant

A Novel Matrix‐Free Hyperfluorescent System Based on Anti‐Quenching TADF Host for High Color Purity MR‐TADF Emitters

π‐Extended Phenoxazine‐Based Asymmetric MR‐TADF Emitters for Narrow Emission Band Green OLEDs with a Power Efficiency of 150 lm W⁻¹, an EQE of 27%, and an LT₉₅ of Over 3000 h at 1000 cdm⁻²

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Tetrapyridine/triphenyltriazine-conjugated electron transporters for low-power-consumption, high-stability phosphorescent OLEDs

Abstract: A series of tetrapyridine/triazine-conjugated electron transporters, TnPyTRZ, was developed. T3PyTRZ realized a turn-on voltage of 2.18 V, power efficiency of over 115 lm W−1, and lifetime of 30 000 h at 1000 cd m−2 in green phosphorescent OLED.

Cited by 10 publications

References 48 publications

Near-infrared phosphorescent OLEDs exhibiting over 10% external quantum efficiency and extremely long lifetime using resonant energy transfer with a phosphorescent assist dopant

Near-infrared phosphorescent OLEDs exhibiting over 10% external quantum efficiency and extremely long lifetime using resonant energy transfer with a phosphorescent assist dopant

A Novel Matrix‐Free Hyperfluorescent System Based on Anti‐Quenching TADF Host for High Color Purity MR‐TADF Emitters

π‐Extended Phenoxazine‐Based Asymmetric MR‐TADF Emitters for Narrow Emission Band Green OLEDs with a Power Efficiency of 150 lm W−1, an EQE of 27%, and an LT95 of Over 3000 h at 1000 cdm−2

Contact Info

Product

Resources

About

π‐Extended Phenoxazine‐Based Asymmetric MR‐TADF Emitters for Narrow Emission Band Green OLEDs with a Power Efficiency of 150 lm W⁻¹, an EQE of 27%, and an LT₉₅ of Over 3000 h at 1000 cdm⁻²