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Selectively regulating and UV–visible-NIR full spectrum blocked ECD based on single molecule-multivalences & resonances strategy.

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Title: Selectively regulating and UV–visible-NIR full spectrum blocked ECD based on single molecule-multivalences & resonances strategy.
Authors: Ling, Huan1,2,3 (AUTHOR) 15602150032@163.com, Wu, Shuangdui1,4,5 (AUTHOR), Han, Jingxin6 (AUTHOR), Zhang, Jie2 (AUTHOR), Lin, Borong1,4,5 (AUTHOR) linbr@tsinghua.edu.cn, Zeng, Xiping1,3 (AUTHOR) xzengad@connect.ust.hk, Wang, Yu1,2 (AUTHOR) wangyu@szu.edu.cn
Source: Chemical Engineering Journal. May2026, Vol. 535, pN.PAG-N.PAG. 1p.
Subjects: Electrochromic devices, Multivalent molecules, Optical modulation, Ab-initio calculations, Thiophene derivatives
Abstract: Full-spectrum blocked electrochromic devices (ECD) suffered from color mixing methods involving multiple optically complementary EC molecules, resulting in complex fabrication processes and poor stability. In this study, a novel strategy termed "single molecule-multivalence & resonances" (SMMR) was introduced. A tetra-pyridinium salt substituted thiophene compound, TTMP, was synthesized, featuring four resonance hybrids and twelve resonance structures. The combination of these distinct yet spectrum-complementary EC resonance hybrids enabled full spectrum blocking in UV–visible to near-infrared (NIR) range, with multiple resonance structures contributing to high stability. The newly developed TTMP-based ECD exhibited high average optical modulation (60.2% in the visible region (380–800 nm) and 65.5% in the NIR region (800–1400 nm)) at a low voltage of 1.2 V, and excellent stability (only 3.3% degradation after 20,000 cycles). Electrochemical energy storage and insulation experiments demonstrated the potential of the ECD for use in EC supercapacitors and solar heat shielding displays. Theoretical calculations using TD-DFT provided insights into the red shift, full spectrum blocking, and selective vis-NIR light regulation capabilities of the ECD. Building simulations indicated significant energy-saving potential of EC windows in various climate zones, with greater energy savings observed in cities with four seasons and hotter climates, reaching over 10%. • Novel SMMR Strategy : A "single molecule-multivalence & resonances" (SMMR) approach enables full-spectrum (UV–Vis-NIR) blocking with one molecule (TTMP). • Ultra-Low Transmittance & High Stability ECD : Achieving near-zero transmittance (0% UV, 4.7% Vis, 7.1% NIR) in colored state with only 3.3% degradation after 20,000 cycles. • Smart Light-Heat Regulation : Realizing three tunable modes (bright/hot, dark/hot, dark/cool) via voltage control (0 V, 0.9 V, 1.2 V) for adaptive light and heat management. • Theoretical & Practical Impact : TD-DFT calculations reveal structure-performance relationships; building simulations predict >10% energy savings in diverse climates. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Full-spectrum blocked electrochromic devices (ECD) suffered from color mixing methods involving multiple optically complementary EC molecules, resulting in complex fabrication processes and poor stability. In this study, a novel strategy termed "single molecule-multivalence & resonances" (SMMR) was introduced. A tetra-pyridinium salt substituted thiophene compound, TTMP, was synthesized, featuring four resonance hybrids and twelve resonance structures. The combination of these distinct yet spectrum-complementary EC resonance hybrids enabled full spectrum blocking in UV–visible to near-infrared (NIR) range, with multiple resonance structures contributing to high stability. The newly developed TTMP-based ECD exhibited high average optical modulation (60.2% in the visible region (380–800 nm) and 65.5% in the NIR region (800–1400 nm)) at a low voltage of 1.2 V, and excellent stability (only 3.3% degradation after 20,000 cycles). Electrochemical energy storage and insulation experiments demonstrated the potential of the ECD for use in EC supercapacitors and solar heat shielding displays. Theoretical calculations using TD-DFT provided insights into the red shift, full spectrum blocking, and selective vis-NIR light regulation capabilities of the ECD. Building simulations indicated significant energy-saving potential of EC windows in various climate zones, with greater energy savings observed in cities with four seasons and hotter climates, reaching over 10%. • Novel SMMR Strategy : A "single molecule-multivalence & resonances" (SMMR) approach enables full-spectrum (UV–Vis-NIR) blocking with one molecule (TTMP). • Ultra-Low Transmittance & High Stability ECD : Achieving near-zero transmittance (0% UV, 4.7% Vis, 7.1% NIR) in colored state with only 3.3% degradation after 20,000 cycles. • Smart Light-Heat Regulation : Realizing three tunable modes (bright/hot, dark/hot, dark/cool) via voltage control (0 V, 0.9 V, 1.2 V) for adaptive light and heat management. • Theoretical & Practical Impact : TD-DFT calculations reveal structure-performance relationships; building simulations predict >10% energy savings in diverse climates. [ABSTRACT FROM AUTHOR]
ISSN:13858947
DOI:10.1016/j.cej.2026.175626