HLCT Driven Twisted Benzo[d]thiazole Based D–A–D Fluorophores for High‐Performance, Two‐Component White LEDs DOI

Swetha Maredi,

Diksha Thakur,

Dhruba Jyoti Boruah

et al.

Chemistry - An Asian Journal, Journal Year: 2025, Volume and Issue: unknown

Published: May 6, 2025

Abstract Design and synthesis of the fluorophores with tailored emission is critical for advanced optoelectronic applications, including white LEDs. Here in this study, we synthesized benzo[d]thiazole‐based donor–acceptor–donor (D–A–D) systems to achieve efficient tunable‐emission properties. Three luminogens (based on triphenylamine, diphenylamine, carbazole as donor units benzo[d]thiazole acceptor units) were designed, synthesized, explored phosphors Single‐crystal X‐ray diffraction revealed significant twisting molecular geometries. These twisted structures effectively reduced conjugation, which resulted a greenish‐blue nonpolar solvents. The photophysical properties these compounds investigated through solvatochromism experiments Lippert–Mataga plots, study reveals that have hybridized local charge transfer (HLCT) character their excited states. Lifetime studies mono‐ bi‐exponential decay. Density functional theory (DFT) calculations performed optimize geometries, close match between theoretical single‐crystal was observed. Further, selected integrated red‐emitting Eu(III) phosphor PMMA matrix fabricate light‐emitting diode (LED). LED device exhibited color rendering index (CRI = 74), excellent chromaticity coordinates ( x 0.29, y 0.30), correlated temperature (CCT 7207 K), luminous efficacy radiation (LER 320 lm/W). We observed introducing an additional diphenylamine D–A–D system (Py‐28–2) enhanced absolute PLQY 46.33%. results demonstrate potential donor‐acceptor applications opto‐electronics lighting technologies.

Language: Английский

HLCT Driven Twisted Benzo[d]thiazole Based D–A–D Fluorophores for High‐Performance, Two‐Component White LEDs DOI

Swetha Maredi,

Diksha Thakur,

Dhruba Jyoti Boruah

et al.

Chemistry - An Asian Journal, Journal Year: 2025, Volume and Issue: unknown

Published: May 6, 2025

Abstract Design and synthesis of the fluorophores with tailored emission is critical for advanced optoelectronic applications, including white LEDs. Here in this study, we synthesized benzo[d]thiazole‐based donor–acceptor–donor (D–A–D) systems to achieve efficient tunable‐emission properties. Three luminogens (based on triphenylamine, diphenylamine, carbazole as donor units benzo[d]thiazole acceptor units) were designed, synthesized, explored phosphors Single‐crystal X‐ray diffraction revealed significant twisting molecular geometries. These twisted structures effectively reduced conjugation, which resulted a greenish‐blue nonpolar solvents. The photophysical properties these compounds investigated through solvatochromism experiments Lippert–Mataga plots, study reveals that have hybridized local charge transfer (HLCT) character their excited states. Lifetime studies mono‐ bi‐exponential decay. Density functional theory (DFT) calculations performed optimize geometries, close match between theoretical single‐crystal was observed. Further, selected integrated red‐emitting Eu(III) phosphor PMMA matrix fabricate light‐emitting diode (LED). LED device exhibited color rendering index (CRI = 74), excellent chromaticity coordinates ( x 0.29, y 0.30), correlated temperature (CCT 7207 K), luminous efficacy radiation (LER 320 lm/W). We observed introducing an additional diphenylamine D–A–D system (Py‐28–2) enhanced absolute PLQY 46.33%. results demonstrate potential donor‐acceptor applications opto‐electronics lighting technologies.

Language: Английский

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