19‐4: Ultra‐Long‐Life Deep‐Blue OLED Device Achieved by Controlling the Carrier Recombination Site

Ishimoto, Takuya; Hashimoto, Naoaki; Nomura, Shiho; Okuyama, Takumu; Nowatari, Hiromi; Suzuki, Tsunenori; Seo, Satoshi; Yamazaki, Shunpei

doi:10.1002/sdtp.14656

Cited by 4 publications

(4 citation statements)

References 4 publications

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“…The short lifetime of the TbPe-doped device using the conventional electron transport layer is probably due to exciton quenching at the MoO 3 interface. Durable OLEDs generally use a multilayered structure with electron, hole, and exciton blocking layers and a strategy for shifting the emission zone 49 . The device structure of the UC-OLED is a simple D/A heterojunction, but it shows relatively high stability.…”

Section: Resultsmentioning

confidence: 99%

Blue organic light-emitting diode with a turn-on voltage of 1.47 V

Izawa,

Morimoto,

Fujimoto

et al. 2023

Nat Commun

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Among the three primary colors, blue emission in organic light-emitting diodes (OLEDs) are highly important but very difficult to develop. OLEDs have already been commercialized; however, blue OLEDs have the problem of requiring a high applied voltage due to the high-energy of blue emission. Herein, an ultralow voltage turn-on at 1.47 V for blue emission with a peak wavelength at 462 nm (2.68 eV) is demonstrated in an OLED device with a typical blue-fluorescent emitter that is widely utilized in a commercial display. This OLED reaches 100 cd/m2, which is equivalent to the luminance of a typical commercial display, at 1.97 V. Blue emission from the OLED is achieved by the selective excitation of the low-energy triplet states at a low applied voltage by using the charge transfer (CT) state as a precursor and triplet-triplet annihilation, which forms one emissive singlet from two triplet excitons.

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Section: Resultsmentioning

confidence: 99%

Blue organic light-emitting diode with a turn-on voltage of 1.47 V

Izawa,

Morimoto,

Fujimoto

et al. 2023

Nat Commun

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“…Recently, the performances based on low-efficiency, high-stability first-generation fluorescence materials employing the TTA emitting mechanism can reach an EQE of 10% with an LT 95 exceeding 800 h . In 2022, Kim and co-workers reported the use of new dopant and host materials to create a blue second-generation blue PhOLED device with a y coordinate of 0.197 and a long device lifetime of LT 70 = 1113 h [initial luminance ( L 0 ) = 1000 cd m –2 ; LT 95 not larger than 200 h] .…”

Section: Limitations and Progressmentioning

confidence: 99%

“…Recently, the performances based on low-efficiency, highstability first-generation fluorescence materials employing the TTA emitting mechanism can reach an EQE of 10% with an LT 95 exceeding 800 h. 175 In 2022, Kim and co-workers reported the use of new dopant and host materials to create a blue second-generation blue PhOLED device with a y coordinate of 0.197 and a long device lifetime of LT 70 = 1113 h [initial luminance (L 0 ) = 1000 cd m −2 ; LT 95 not larger than 200 h]. 176 Inspiringly, by using MoO 3 /SimCP 2 as a holeinjection layer and a thick layer of TAPC as a hole-transporting layer, Wang and coauthors 177 found that the red, green, and blue PhOLEDs exhibit excellent extrapolated LT 95 operational lifetimes of around 55000, 18000, and 1600 h, respectively, at an initial luminance of 1000 cd cm −2 .…”

Section: Operation Lifetimementioning

confidence: 99%

Boosting Organic Light-Emitting Diodes Technology Using Thermally Activated Delayed Fluorescent Emitters: A Review

Wang,

Yuan,

Wang

et al. 2024

ACS Appl. Eng. Mater.

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Organic thermally activated delayed fluorescence (TADF) materials have become a focal point of research in the field of organic electronics due to their natural capacity to achieve 100% exciton utilization efficiency in organic light-emitting diodes (OLEDs) without the aid of noble metals. The combination of high efficiency seen in phosphorescent materials coupled with the straightforward synthesis and robust stability characteristic of fluorescent materials positions TADF as a compelling option for OLEDs, although their commercialization is at an early stage. A review of the current state of TADF emitters is timely and underscores the key challenges that must be overcome toward the development of a long operational time and high-efficiency TADF-based electroluminescent application in the future. In this paper, TADF materials are discussed and summarized by dividing into blue, green− yellow, and orange−red OLEDs according to the specific color of the devices. Molecular structure modification and its effect on the optoelectronic properties and device performance are discussed in detail to reveal the structure−property relationship. Importantly, the strategic protocol to enhance the device efficiency and operational stability is also presented, which provides future prospects for real-world applications.

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“… a Performances of TTA device based on low-efficiency, high-stability 1st-Gen fluorescence materials 50 , 51 , PH device based on high-efficiency, low-stability 2nd-Gen blue PH materials 52 and hyperfluorescence (HF) device based on high-efficiency, low-stability 3rd-Gen TADF materials 10 . (Kwon et al did not report the operational lifetime of HF device).…”

Section: Introductionmentioning

confidence: 99%

Longevity gene responsible for robust blue organic materials employing thermally activated delayed fluorescence

Meng,

Wang,

Wang

et al. 2023

Nat Commun

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The 3rd-Gen OLED materials employing thermally-activated delayed fluorescence (TADF) combine advantages of first two for high-efficiency and low-cost devices. Though urgently needed, blue TADF emitters have not met stability requirement for applications. It is essential to elucidate the degradation mechanism and identify the tailored descriptor for material stability and device lifetime. Here, via in-material chemistry, we demonstrate chemical degradation of TADF materials involves critical role of bond cleavage at triplet state rather than singlet, and disclose the difference between bond dissociation energy of fragile bonds and first triplet state energy (BDE-ET1) is linearly correlated with logarithm of reported device lifetime for various blue TADF emitters. This significant quantitative correlation strongly reveals the degradation mechanism of TADF materials have general characteristic in essence and BDE-ET1 could be the shared “longevity gene”. Our findings provide a critical molecular descriptor for high-throughput-virtual-screening and rational design to unlock the full potential of TADF materials and devices.

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19‐4: Ultra‐Long‐Life Deep‐Blue OLED Device Achieved by Controlling the Carrier Recombination Site

Cited by 4 publications

References 4 publications

Blue organic light-emitting diode with a turn-on voltage of 1.47 V

Blue organic light-emitting diode with a turn-on voltage of 1.47 V

Boosting Organic Light-Emitting Diodes Technology Using Thermally Activated Delayed Fluorescent Emitters: A Review

Longevity gene responsible for robust blue organic materials employing thermally activated delayed fluorescence

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