Introducing Spiro‐locks into the Nitrogen/Carbonyl System towards Efficient Narrowband Deep‐blue Multi‐resonance TADF Emitters DOI Open Access
You‐Jun Yu, Ziqi Feng,

Xin‐Yue Meng

и другие.

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(40)

Опубликована: Авг. 19, 2023

The current availability of multi-resonance thermally activated delayed fluorescence (MR-TADF) materials with excellent color purity and high device efficiency in the deep-blue region is appealing. To address this issue emerged nitrogen/carbonyl MR-TADF system, we propose a spiro-lock strategy. By incorporating spiro functionalization into concise molecular skeleton, series emitters (SFQ, SOQ, SSQ, SSeQ) can enhance rigidity, blue-shift emission peak, narrow band, increase photoluminescence quantum yield by over 92 %, suppress intermolecular interactions film state. referent CZQ without structure has more planar its bluer solution state redshifts 40 nm serious spectrum broadening low PLQY As result, SSQ achieves an external 25.5 % peak at 456 small full width half maximum 31 simple unsensitized device, significantly outperforming CZQ. This work discloses importance spiro-junction modulating emitters.

Язык: Английский

Highly efficient and stable deep-blue OLEDs based on narrowband emitters featuring an orthogonal spiro-configured indolo[3,2,1-de]acridine structure DOI Creative Commons
Guoyun Meng, Dongdong Zhang, Jinbei Wei

и другие.

Chemical Science, Год журнала: 2022, Номер 13(19), С. 5622 - 5630

Опубликована: Янв. 1, 2022

High-efficiency and stable deep-blue bottom-emitting organic light-emitting diodes with Commission Internationale de l'Eclairage

Язык: Английский

Процитировано

60
Nitrogen‐Embedded Multi‐Resonance Heteroaromatics with Prolonged Homogeneous Hexatomic Rings DOI

Xuan Zeng,

Xiang Wang, Yuewei Zhang

и другие.

Angewandte Chemie International Edition, Год журнала: 2022, Номер 61(14)

Опубликована: Янв. 29, 2022

Nitrogen-containing polycyclic heteroaromatics have exhibited fascinating multi-resonance (MR) characteristics for efficient narrowband emission, but strategies to bathochromic shift their emissions while maintaining the narrow bandwidths remain exclusive. Here, homogeneous hexatomic rings are introduced into nitrogen-embedded MR skeletons prolong π-conjugation length low-energy electronic transitions retaining non-bonding character of remaining parts. The proof-of-the-concept emitters exhibit near unity photoluminescence quantum yields with peaks at 598 nm and 620 small full-width-at-half-maximums 28 31 nm, respectively. Optimal organic light-emitting diodes a high external efficiency 18.2 %, negligible roll-off, ultra-long lifetime degradation an initial luminance 10 000 cd m-2 after 94 hours.

Язык: Английский

Процитировано

58
An S-shaped double helicene showing both multi-resonance thermally activated delayed fluorescence and circularly polarized luminescence DOI Creative Commons
John Marques dos Santos, Dianming Sun, Juan Manuel Moreno-Naranjo

и другие.

Journal of Materials Chemistry C, Год журнала: 2022, Номер 10(12), С. 4861 - 4870

Опубликована: Янв. 1, 2022

We present the first example of a MR-TADF extended helicene.

Язык: Английский

Процитировано

46
Multi-resonant thermally activated delayed fluorescence emitters based on tetracoordinate boron-containing PAHs: colour tuning based on the nature of chelates DOI Creative Commons
Guoyun Meng, Lijie Liu,

Zhechang He

и другие.

Chemical Science, Год журнала: 2022, Номер 13(6), С. 1665 - 1674

Опубликована: Янв. 1, 2022

Multi-resonant thermally activated delayed fluorescence (MR-TADF) materials have attracted considerable attention recently. The molecular design frequently incorporates cycloboration. However, to the best of our knowledge MR-TADF compounds containing nitrogen chelated boron are still unknown. Reported herein is a new class tetracoordinate boron-containing emitters bearing C^N^C- and N^N^N-chelating ligands. We demonstrate that replacement B-C covalent bond in C^N^C-chelating ligand by B-N affords an isomer, which dramatically influences optoelectronic properties molecule. resulting show bathochromically shifted absorption emission spectra relative compounds. incorporation tert-butylcarbazole group at 4-position pyridine significantly enhances both thermal stability reverse intersystem crossing rate, yet has negligible effect on properties. Consequently, high-performance hyperfluorescent organic light-emitting diodes (HF-OLEDs) utilize these molecules as green yellow-green maximum external quantum efficiency (ηext) 11.5% 25.1%, suppressed roll-off with ηext 10.2% 18.7% luminance 1000 cd m-2, respectively.

Язык: Английский

Процитировано

42
Introducing Spiro‐locks into the Nitrogen/Carbonyl System towards Efficient Narrowband Deep‐blue Multi‐resonance TADF Emitters DOI Open Access
You‐Jun Yu, Ziqi Feng,

Xin‐Yue Meng

и другие.

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(40)

Опубликована: Авг. 19, 2023

The current availability of multi-resonance thermally activated delayed fluorescence (MR-TADF) materials with excellent color purity and high device efficiency in the deep-blue region is appealing. To address this issue emerged nitrogen/carbonyl MR-TADF system, we propose a spiro-lock strategy. By incorporating spiro functionalization into concise molecular skeleton, series emitters (SFQ, SOQ, SSQ, SSeQ) can enhance rigidity, blue-shift emission peak, narrow band, increase photoluminescence quantum yield by over 92 %, suppress intermolecular interactions film state. referent CZQ without structure has more planar its bluer solution state redshifts 40 nm serious spectrum broadening low PLQY As result, SSQ achieves an external 25.5 % peak at 456 small full width half maximum 31 simple unsensitized device, significantly outperforming CZQ. This work discloses importance spiro-junction modulating emitters.

Язык: Английский

Процитировано

41