Aromaticity Localization Effects in Polycyclic Aromatic Hydrocarbons for Discovering Narrowband Fluorescence Materials DOI
Yimin Wu, Junjie Liu, Ge Yang

и другие.

Journal of the American Chemical Society, Год журнала: 2025, Номер unknown

Опубликована: Май 22, 2025

Achieving narrowband fluorescence in polycyclic aromatic hydrocarbons (PAHs) is crucial for ultrahigh-definition organic light-emitting diodes (UD-OLEDs), yet the underlying structure-property relationships that dictate emission bandwidth remain insufficiently understood. In this study, we introduce aromaticity localization as a predictive framework identifying emitters. Using nucleus-independent chemical shift (NICS) analysis, uncover strong correlation between localized and reduced vibrational coupling, demonstrating restricting π-electron delocalization effectively suppresses shoulder peaks, thereby minimizing spectral broadening. To validate concept, designed new class of imine-amine-type PAHs (IA-PAHs) integrates electron-deficient imine electron-rich amine units, generating multiple-resonance-type electronic structure. Building on steric-hindrance-guided C-H activation strategy, precisely controlled regioselectivity pyridine fusion within triphenylamine framework, leading to discovery red-emitting II-b green-emitting III-c featuring aromaticity. Notably, exhibited an exceptionally red at 660 nm with full width half-maximum only 35 (0.10 eV). OLEDs incorporating demonstrated high efficiency minimal roll-off fully met stringent BT.2020 standard, Commission Internationale de l'Eclairage (CIE) coordinates [0.71, 0.29]. This work not establishes empirical intuitive design principle fluorophores but also represents significant advancement deep-red OLED technology, setting benchmark conventional fluorescent

Язык: Английский

Comprehensive Review on the Structural Diversity and Versatility of Multi-Resonance Fluorescence Emitters: Advance, Challenges, and Prospects toward OLEDs DOI Creative Commons
Xiugang Wu,

Songqian Ni,

Chih‐Hsing Wang

и другие.

Chemical Reviews, Год журнала: 2025, Номер unknown

Опубликована: Май 9, 2025

Fluorescence emitters with a multiple-resonant (MR) effect have become research hotspot. These MR mainly consist of polycyclic aromatic hydrocarbons boron/nitrogen, nitrogen/carbonyl, and indolocarbazole frameworks. The staggered arrangement the highest occupied molecular orbital lowest unoccupied facilitates MR, resulting in smaller internal reorganization energy narrower emission bandwidth. Optimal charge separation suppresses gap between singlet triplet excited states, favoring thermally activated delayed fluorescence (TADF). MR-TADF materials, due to color purity high efficiency, are excellent candidates for organic light-emitting diodes. Nevertheless, significant challenges remain; particular, limitation imposed by alternated core configuration hinders their diversity versatility. Most existing materials concentrated blue-green range, only few red near-infrared spectra. This review provides timely comprehensive screening from pioneering work present. Our goal is gain understandings structure-performance relationship both basic advanced perspectives. Special emphasis placed on exploring correlations chemical structure, photophysical properties electroluminescent performance depth breadth an aim promote future development emitters.

Язык: Английский

Процитировано

0
Aromaticity Localization Effects in Polycyclic Aromatic Hydrocarbons for Discovering Narrowband Fluorescence Materials DOI
Yimin Wu, Junjie Liu, Ge Yang

и другие.

Journal of the American Chemical Society, Год журнала: 2025, Номер unknown

Опубликована: Май 22, 2025

Achieving narrowband fluorescence in polycyclic aromatic hydrocarbons (PAHs) is crucial for ultrahigh-definition organic light-emitting diodes (UD-OLEDs), yet the underlying structure-property relationships that dictate emission bandwidth remain insufficiently understood. In this study, we introduce aromaticity localization as a predictive framework identifying emitters. Using nucleus-independent chemical shift (NICS) analysis, uncover strong correlation between localized and reduced vibrational coupling, demonstrating restricting π-electron delocalization effectively suppresses shoulder peaks, thereby minimizing spectral broadening. To validate concept, designed new class of imine-amine-type PAHs (IA-PAHs) integrates electron-deficient imine electron-rich amine units, generating multiple-resonance-type electronic structure. Building on steric-hindrance-guided C-H activation strategy, precisely controlled regioselectivity pyridine fusion within triphenylamine framework, leading to discovery red-emitting II-b green-emitting III-c featuring aromaticity. Notably, exhibited an exceptionally red at 660 nm with full width half-maximum only 35 (0.10 eV). OLEDs incorporating demonstrated high efficiency minimal roll-off fully met stringent BT.2020 standard, Commission Internationale de l'Eclairage (CIE) coordinates [0.71, 0.29]. This work not establishes empirical intuitive design principle fluorophores but also represents significant advancement deep-red OLED technology, setting benchmark conventional fluorescent

Язык: Английский

Процитировано

0