Highly Dissymmetric Circularly Polarized Luminescence via Multimode Chirality Enhancement in Hierarchically Ordered Liquid Crystal Films DOI Open Access
Mateusz Pawlak,

Adam Pierzchała,

Élie Benchimol

et al.

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 26, 2024

Abstract Circularly polarized luminescence (CPL) in purely organic materials is limited by the almost exclusively electric nature of electronic transitions. Resolving this problem possible through structuring at dimensions comparable to wavelength visible light. Here, study explores use thin films made chiral nanotubes for enhanced induction CPL. The first performs multi‐scale modeling chiroptical properties using T‐matrix method. Combined with measurements, including Mueller matrix polarimetry, discusses within frames their structuring. When embedding aggregation‐induced fluorogens (AIEgens) into structured films, composites featured gigantic g lum factors reaching ≈10 −1 are obtained. Importantly, a series control experiments performed exclude common parasitic effects that can lead apparent CPL signals. composite and AIEgens enable visual discrimination handedness both absorption emission realms. uncovered multi‐mode enhancement directs future endeavors anticounterfeiting or holography applications.

Language: Английский

Chiral hybrid manganese(ii) halide clusters with circularly polarized luminescence for X-ray imaging DOI Open Access

Mengzhu Wang,

Xiaoming Wang,

Bintao Zhang

et al.

Journal of Materials Chemistry C, Journal Year: 2023, Volume and Issue: 11(9), P. 3206 - 3212

Published: Jan. 1, 2023

Two pairs of enantiomorphic organic–inorganic hybrid manganese( ii ) halide clusters show excellent CPL properties and work as scintillators in X-ray detection imaging.

Language: Английский

Citations

28
Recent development of azahelicenes showing circularly polarized luminescence DOI Creative Commons
Chihiro Maeda, Tadashi Ema

Chemical Communications, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

This feature article summarizes the recent developments of azahelicenes showing circularly polarized luminescence.

Language: Английский

Citations

0
Push–pull [7]helicene diimide: excited-state charge transfer and solvatochromic circularly polarised luminescence DOI

Fridolin Saal,

Asim Kumar Swain, Alexander Schmiedel

et al.

Chemical Communications, Journal Year: 2023, Volume and Issue: 59(94), P. 14005 - 14008

Published: Jan. 1, 2023

Herein we describe a helically chiral push–pull molecule named 9,10-dimethoxy-[7]helicene diimide, displaying fluorescence and CPL over nearly the entire visible spectrum dependent on solvent polarity along with high dissymmetry factors.

Language: Английский

Citations

6
Enhanced Horizontal Dipole Orientation by Novel Penta‐Helicene Anthracene‐Based Host for Efficient Blue Fluorescent OLEDs DOI

Changchun Kuang,

Siqi Li, Imran Murtaza

et al.

Small, Journal Year: 2023, Volume and Issue: 20(24)

Published: Dec. 29, 2023

Abstract Due to the relatively low photoluminescence quantum yield (PLQY) and horizontal dipole orientation of doped films, anthracene‐based fluorescent organic light‐emitting diodes (F‐OLEDs) have faced a great challenge achieve high external efficiency ( EQE ). Herein, novel approach is introduced by incorporating penta‐helicene into anthracene, presented as linear‐shaped 3‐(4‐(10‐phenylanthracen‐9‐yl)phenyl)dibenzo[c,g]phenanthrene (BABH) 3‐(4‐(10‐(naphthalen‐2‐yl)anthracen‐9‐yl)phenyl)dibenzo[c,g]phenanthrene (NABH). These blue hosts exhibit minimal intermolecular overlap π – stacking, effectively suppressing excimer formation, which facilitates effective transfer singlet energy dopant for PLQY 90%. Additionally, as‐obtained two BABH NABH demonstrated major components transition moments (TDM) thermal stability with glass transitional temperature T g ) surpassing 188 °C, enhancing their films be 89% 93%, respectively. The OLEDs based on excellent 10.5% 12.4% at 462 nm device lifetime up 90% initial luminance over 4500 h 100 cd m −2 , has firmly established them among most efficient F‐OLEDs anthracene date best knowledge. This work provides an instructive strategy design host highly stable F‐OLEDs.

Language: Английский

Citations

6
Synthesis of methyl-substituted aza[7]helicene with enhanced configurational stability and chiroptical performance DOI
Xing-Yu Chen, Jikun Li,

Chan Wang

et al.

Tetrahedron Letters, Journal Year: 2024, Volume and Issue: 139, P. 154981 - 154981

Published: Feb. 29, 2024

Language: Английский

Citations

2
Synthesis, enantiomeric separation and (chir)optical properties of [7]helicene derivatives for OLED applications. A comprehensive experimental and computational investigation DOI

Ibtissem Hajji,

Taye B. Demissie,

Alhafez M. Alraih

et al.

Journal of Molecular Structure, Journal Year: 2024, Volume and Issue: 1319, P. 139493 - 139493

Published: July 29, 2024

Language: Английский

Citations

1
Argi polarizatu zirkularra igortzen duten molekula kiral adimendunak DOI Open Access
Ainhoa Oliden‐Sánchez, Natalia Casado, Edurne Avellanal‐Zaballa

et al.

EKAIA Euskal Herriko Unibertsitateko Zientzi eta Teknologi Aldizkaria, Journal Year: 2023, Volume and Issue: 45, P. 191 - 207

Published: July 27, 2023

Modu zirkularrean polarizatuta dagoen argia xurgatzeko eta batez ere igortzeko gai diren molekula zein material kiralen garapena egungo gaia da kimikan materialen zientzietan. Izan ere, biomolekula ugari kiralak dira haien portaera nabarmen aldatzen molekularen konfigurazioaren arabera. Hori dela eta, argi polarizatua enantiomeroak bereizteko da, aldiz ez-polarizatuak ez du ahalmen hori. Kimika organikoaren inguruan egindako aurrerapenek kromoforo enantiomeriko puruak lortzea ahalbidetzen dute, bai oinarrizko egitura molekularraren birmoldaketa dituzten ezaugarri fotonikoak hobetzeko. Segur aski, BINOLa helizenoa dikroismo zirkularra zirkularki polarizatutako luminiszentzia duten kiral organiko ezagunenak. Hala hainbat erronka gainditu behar optikoa Adibidez, interesgarria izango litzateke lan egiteko zona espektrala ultramoretik ikusgaiko alde gorrira eramatea horien fluoreszentea handitzea polarizatuaren distira suspertzeko. Helburu horiek lortzeko, aproposak izan daitezke BODIPY izeneko koloratzaileak, kimika aldakorrari esker aldaketak egin daitezkeelako molekularrean eskaera kiroptikoen Hain zuzen honetan kromoforoan oinarrituta garatutako bi estrategia aurkezten kiraltasun moldagarria lortzeko; helikoBODIPYak BINOL-O- BODIPYak. Hurrengo lerroetan eztabaidatu egiten diseinu motibazioa sistema optikoki aktibo gisa jarduteko dituen gaitasunak.

Citations

1
Bridge-induced taming of the visible electronic circular dichroism signatures of helicoBODIPYs DOI Creative Commons
Carolina Díaz-Norambuena,

César Ray,

Teresa Arbeloa

et al.

Dyes and Pigments, Journal Year: 2023, Volume and Issue: 222, P. 111907 - 111907

Published: Dec. 23, 2023

Helically-flexible bis(BODIPY)s based on chiral ethane-1,2-diamine or −1,2-diol bridges (named helicoBODIPYs) are an interesting family of accessible and tunable small multichromophoric organic dyes enabling visible electronic circular dichroism (ECD) and, even circularly polarized luminescence (CPL). However, their CPL brightness (BCPL) is still limited (up to ca. 10 M−1cm−1), due low fluorescence efficiency owing a non-optimal participation intramolecular charge transfer (CT) emission. Herein, we analyze in depth the origin factors controlling this CT, demonstrating key BODIPY-to-BODIPY symmetry-breaking induced CT (SBCT), beyond expected within each single BODIPY chromophore push-pull character. It also demonstrated that increasing overcrowding at flexible helicoBODIPY ethane leads BODIPY-BODIPY faced dispositions, promoting SBCT detection both absorption emission bands under specific conditions. Interestingly, enhances ECD (absolute gabs values), supporting role involved forbidden transitions chiroptical activity these dyes, as well possibility modulating valuable signatures (e.g., brightness) by easily playing with steric dye bridge.

Language: Английский

Citations

1
Highly Dissymmetric Circularly Polarized Luminescence via Multimode Chirality Enhancement in Hierarchically Ordered Liquid Crystal Films DOI Open Access
Mateusz Pawlak,

Adam Pierzchała,

Élie Benchimol

et al.

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 26, 2024

Abstract Circularly polarized luminescence (CPL) in purely organic materials is limited by the almost exclusively electric nature of electronic transitions. Resolving this problem possible through structuring at dimensions comparable to wavelength visible light. Here, study explores use thin films made chiral nanotubes for enhanced induction CPL. The first performs multi‐scale modeling chiroptical properties using T‐matrix method. Combined with measurements, including Mueller matrix polarimetry, discusses within frames their structuring. When embedding aggregation‐induced fluorogens (AIEgens) into structured films, composites featured gigantic g lum factors reaching ≈10 −1 are obtained. Importantly, a series control experiments performed exclude common parasitic effects that can lead apparent CPL signals. composite and AIEgens enable visual discrimination handedness both absorption emission realms. uncovered multi‐mode enhancement directs future endeavors anticounterfeiting or holography applications.

Language: Английский

Citations

0