A Rigid Multiple Resonance Thermally Activated Delayed Fluorescence Core Toward Stable Electroluminescence and Lasing

Tang, Xun; Xie, Mingchen; Lin, Zesen; Mitrofanov, Kirill; Tsagaantsooj, Tuul; Lee, Yi‐Ting; Kabe, Ryota; Sandanayaka, Atula S. D.; Matsushima, Toshinori; Hatakeyama, Takuji; Adachi, Chihaya

doi:10.1002/anie.202315210

Cited by 3 publications

(2 citation statements)

References 53 publications

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“…14−16 Moreover, the multiple-resonance (MR) effect induced by alternating electron-donating and -withdrawing atoms initiates the thermally activated delayed fluorescence (TADF) characteristic of harnessing triplet excitons. 3,17,18 Ensuring high color purity and primary red−green−blue (RGB) emission with wide-range wavelength maximum (630, 532, and 467 nm for RGB) for each individual pixel is mandatory. Notably, a wavelength shift exceeding 163 nm (∼0.69 eV) between blue and red emissions is required.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Achieving a wide color gamut while preserving exceptional electroluminescence (EL) durability remains a critical challenge in cutting-edge display applications. − To meet the International Telecommunication Union-Radiocommunication Recommendation BT.2020 (Rec.2020) standard, a narrow spectral width is essential for a wide color gamut. , Notably, a highly robust π-conjugated framework, proposed in 2016, comprising alternate boron/nitrogen (B/N) atoms, has enabled the attainment of extremely narrow full-width-at-half-maximums (FWHMs) of <20 nm from pure organic emitters. − Moreover, the multiple-resonance (MR) effect induced by alternating electron-donating and -withdrawing atoms initiates the thermally activated delayed fluorescence (TADF) characteristic of harnessing triplet excitons. ,, …”

Section: Introductionmentioning

confidence: 99%

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“Core–Shell” Wave Function Modulation in Organic Narrowband Emitters

Hayakawa,

Tang,

Ueda

et al. 2024

J. Am. Chem. Soc.

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Efficient red−green−blue primary luminescence with an extraordinarily narrow band and durability is crucial for advanced display applications. Recently, the emergence of multiple-resonance (MR) from short-range atomic interactions has been shown to induce extremely narrow spectral widths in pure organic emitters. However, achieving wide-range color tuning without compromising color purity remains a persistent challenge for MR emitters. Herein, the concept of electronic donor/acceptor "core−shell" modulation is proposed within a boron/nitrogen (B/ N) MR skeleton, enabling the rational utilization of intramolecular charge transfer to facilitate wavelength shift. The dense B atoms localized at the center of the molecule effectively compress the electron density and stabilize the lowest unoccupied molecular orbital wave function. This electron-withdrawing core is embedded with peripheral electron-donating atoms. Consequently, doping a single B atom into a deep-blue MR framework led to a profound bathochromic shift from 447 to 624 nm (∼0.8 eV) while maintaining a narrow spectral width of 0.10 eV in this pure-red emitter. Notably, organic light-emitting diodes assisted by thermally activated delayed fluorescence molecules achieved superb electroluminescent stability, with an LT 99 (99% of the initial luminance) exceeding 400 h at an initial luminance of 1000 cd m −2 , approaching commercial-level performance without the assistance of phosphors.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“Core–Shell” Wave Function Modulation in Organic Narrowband Emitters

Hayakawa,

Tang,

Ueda

et al. 2024

J. Am. Chem. Soc.

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Electron Donor‐Functionalized Pyrenes with Amplified Spontaneous Emission for Violet–Blue Electroluminescent Devices Beyond the Spin Statistical Limit

Welscher,

Straub,

Stümpges

et al. 2024

Adv Funct Materials

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Direct electrically pumped organic lasers remain inaccessible to date, due to an interplay of different adverse effects. The most important of these effects are insufficient charge carrier mobility in the organic material, accumulation of triplet excitons upon charge injection, and absorption from the electrodes in the device. While triplet state management can be achieved using molecules that recycle triplet states into emissive singlet states, these molecules rarely support amplified emission. Pyrene derivatives not only show excellent charge transport properties, but their rigid π‐conjugated structure also entails excellent electro‐ and photoluminescence efficiency. Pyrenes exhibit very low‐lying first excited triplet states, rendering this class of molecules interesting for ultrafast upper‐level reverse intersystem crossing. This process counteracts the triplet accumulation in organic lasers. Here, pyrenes are functionalized with electron‐rich moieties of different donor strengths. Through comprehensive spectroscopic and quantum chemical analysis, the character of the charge transfer excited state is correlated with optical properties, excited state lifetimes, amplified spontaneous emission, and triplet recycling. Two donor functionalized pyrenes are reported with violet–blue emission that overcome the spin‐statistical limit of conventional organic emitters with spin factors ηST of up to 0.43 and low thresholds for amplified spontaneous emission Eth down to 1.73 µJ cm−2.

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Concluding remarks: challenges and prospects in organic photonics and electronics

Nishide

2024

Faraday Discuss.

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A Rigid Multiple Resonance Thermally Activated Delayed Fluorescence Core Toward Stable Electroluminescence and Lasing

Cited by 3 publications

References 53 publications

“Core–Shell” Wave Function Modulation in Organic Narrowband Emitters

“Core–Shell” Wave Function Modulation in Organic Narrowband Emitters

Electron Donor‐Functionalized Pyrenes with Amplified Spontaneous Emission for Violet–Blue Electroluminescent Devices Beyond the Spin Statistical Limit

Concluding remarks: challenges and prospects in organic photonics and electronics

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