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The emergence of metal‐organic frameworks (MOFs) provides a new platform of low‐cost and color‐saturated blue light‐emitting diodes ideal for display and solid‐state lighting applications. However, numerous established MOFs still exhibit weak deep‐blue‐light emission (<450 nm) owing to low energy/charge transfer efficiency. Here a pressure‐treated strategy to greatly enhance photoluminescence performance of deep‐blue light‐emitting Y(BTC)(H2O)6 (H3BTC: benzene‐1,3,5‐tricarboxylic acid) is reported. Pressure‐treated Y(BTC)(H2O)6 exhibits a bright emission at 409 nm with a photoluminescence quantum yield from the initial 2.8% increasing to 75.0%. The hydrogen bonding cooperativity effect increases hydrogen bond binding energy after pressure treatment and thus the planarization structure is locked. The increased electronic transition diversity and oscillator strength originating from the planarization structure are highly responsible for boosting metal‐to‐ligand charge transfer. The findings in this study provide significant insights into the underlying mechanism of the structure‐property relationship in Y(BTC)(H2O)6 and offer a promising strategy to harvest deep‐blue‐emitting MOFs materials. [ABSTRACT FROM AUTHOR]

Lanthanide metal–organic frameworks are of great interest in the development of photoluminescence (PL) materials owing to their structural tunability and intrinsic features of lanthanide elements. However, there exists some limitations arising from poor matching with metal ions, thereby exhibiting a weak ligand‐to‐metal energy transfer (LMET) process. Here we demonstrate a pressure‐treated strategy for achieving high PL performance in green‐emitting Tb(BTC)(H2O)6. The PL quantum yield of pressure‐treated sample increased from 50.6 % to 90.4 %. We found that the enhanced hydrogen bonds locked the conjugated configuration formed by two planes of carboxyl group and benzene ring, enabling the promoted intersystem crossing to effectively drive LMET. Moreover, the optimized singlet and triplet states also validated the facilitated LMET process. This work opens the opportunity of structure optimization to improve PL performance in MOFs by pressure‐treated engineering. [ABSTRACT FROM AUTHOR]

Lanthanide metal–organic frameworks are of great interest in the development of photoluminescence (PL) materials owing to their structural tunability and intrinsic features of lanthanide elements. However, there exists some limitations arising from poor matching with metal ions, thereby exhibiting a weak ligand‐to‐metal energy transfer (LMET) process. Here we demonstrate a pressure‐treated strategy for achieving high PL performance in green‐emitting Tb(BTC)(H2O)6. The PL quantum yield of pressure‐treated sample increased from 50.6 % to 90.4 %. We found that the enhanced hydrogen bonds locked the conjugated configuration formed by two planes of carboxyl group and benzene ring, enabling the promoted intersystem crossing to effectively drive LMET. Moreover, the optimized singlet and triplet states also validated the facilitated LMET process. This work opens the opportunity of structure optimization to improve PL performance in MOFs by pressure‐treated engineering. [ABSTRACT FROM AUTHOR]

GLO:44U/25nov22:anie202215826-toc-0001.jpg PHOTO (COLOR): . gl GLO:44U/25nov22:anie202215826-toc-0001.jpg PHOTO (COLOR): . gl B A pressure-treatment strategy b for achieving high photoluminescence performance in a green-emitting Tb-based metal-organic framework is reported by Xinyi Yang, Qianrong Fang, Banglin Chen, Bo Zou et al. in their Research Article (e202210836). Fluorescent Monochromaticity, Green Photoluminescence Enhancement, Lanthanide Metal-Organic Frameworks, Ligand-to-Metal Energy Transfer, Pressure-Treated Engineering Cover Picture: Maximized Green Photoluminescence in Tb-Based Metal-Organic Framework via Pressure-Treated Engineering (Angew. [Extracted from the article]

Keywords: Fluorescent Monochromaticity; Green Photoluminescence Enhancement; Lanthanide Metal-Organic Frameworks; Ligand-to-Metal Energy Transfer; Pressure-Treated Engineering EN Fluorescent Monochromaticity Green Photoluminescence Enhancement Lanthanide Metal-Organic Frameworks Ligand-to-Metal Energy Transfer Pressure-Treated Engineering 1 1 1 11/22/22 20221125 NES 221125 B Die Photolumineszenzausbeute b in einem grün-emittierenden metallorganischen Gerüst auf Tb-Basis lässt sich mittels Druckbehandlung steigern, wie Xinyi Yang, Qianrong Fang, Banglin Chen, Bo Zou und Mitarbeiter in ihrem Forschungsartikel berichten (e202210836). Die verstärkten Wasserstoffbrücken verriegeln die konjugierte Konfiguration und ermöglichen Intersystem-Crossing, was den Metall-zu-Ligand-Energietransfer beschleunigt. Fluorescent Monochromaticity, Green Photoluminescence Enhancement, Lanthanide Metal-Organic Frameworks, Ligand-to-Metal Energy Transfer, Pressure-Treated Engineering. [Extracted from the article]