Quantifying Fluorescence Contrast of Latent Fingerprints Developed with Micro/Nanoparticles through Spectroscopic Analysis

Talanta, Journal Year: 2025, Volume and Issue: 288, P. 127717 - 127717

Published: Feb. 11, 2025

Language: Английский

Multi‐Stimulus Responsive Nonconventional Fluorescent Supramolecular Polymeric Material

Macromolecular Chemistry and Physics, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 20, 2025

Abstract Fluorescent supramolecular materials have attracted a lot of attention over the past few decades. However, those can respond to multiple stimuli are not often reported, especially for nonconventional fluorescent materials. Here, material is reported that temperature/electrical heating, humidity, volatile acids/organic amines, and mechanical strain. This prepared by physical mixing oligomeric polyethyleneimine (o‐PEI) polyacrylic acid (o‐PAA). Although they almost non‐fluorescent, their combination produces bright fluorescence, emission bands shift longer wavelengths as amount o‐PAA increases. Calculations based on Density Functional Theory (DFT) show there strong noncovalent interactions between o‐PEI o‐PAA, resulting in through‐space conjugation cluster‐triggered emission. By studying relationship intensity, temperature, molecular motion, dependence intensity relaxation time established, which will provide insight into luminescence origin In addition, this shows good self‐healing ability. The luminescence, responsiveness self‐reparability all related but reversible bonds link o‐PAA. work only highlights value polymers, also enriches research

Language: Английский

Strategies for Enabling RGB Emission in Fused Carbazole Derivatives

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

Published: May 1, 2025

The development of organic light-emitting diodes (OLEDs) has witnessed remarkable progress in material design and device architecture. Recent advancements, particularly the fourth generation OLEDs, have introduced groundbreaking innovations such as hyperfluorescence multiresonance (MR) thermally activated delayed fluorescence (MRTADF) emitters. Carbazole emerged a versatile scaffold, playing pivotal role conventional fluorescence, TADF, roomtemperature phosphorescence (RTP), MRTADF systems. In recent years, fused carbazole derivatives gained significant attention both emitting host materials OLEDs. fusion units enhances molecular rigidity extends πconjugation, enabling precise tuning optoelectronic properties across wide color gamut, including blue, green, orange, yellow, red emissions. This review systematically explores application various systems indolocarbazole, thienocarbazole, furocarbazole, indenocarbazole, triazatruxene, acridinecarbazole, chromenocarbazole, pyrenocarbazole, helicene carbazole, carbazolefused boron/carbonyl emitters discussion is organized into three sections based on their providing comprehensive understanding structure-property relationships. Additionally, other color-emitting OLEDs are discussed where relevant, offering holistic perspective potential next-generation OLED technologies.

Language: Английский