Enhanced Circularly Polarized Luminescence Modulation Using Dichroic Conjugated Polymer in Cholesteric Liquid Crystals DOI Open Access

Yihan Chen,

Lulu Li, Kun Yao

et al.

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

Published: Dec. 25, 2024

Abstract Negative dichroic dyes are crucial for enhancing the brightness of liquid crystal displays (LCDs) and modulating circularly polarized luminescence (CPL) in cholesteric crystals (CLCs) through supramolecular co‐assembly. However, majority fluorescent molecules exhibit positive dichroism, there is a limited understanding designing negative molecules. In this paper, novel design principle proposed to construct polymer by introducing space charge transfer (TSCT) side chain structure backbone. Specifically, two conjugated polymers (P1, P2) synthesized using Suzuki coupling reaction donor‐acceptor (D‐A) type monomers (V‐type M1 I‐type M2) with fluorenyl monomer. P1 exhibits its orientational order parameter (S F ) up S FP1 = –0.18. On contrary, P2 dichroism ( FP2 + 0.27). This variation arises from differing orientations rigidly functional chains FM1 0.07; FM2 0.31), which affect alignment (parallel or perpendicular) backbone toward CLCs phenomenon facilitates controllable precisely modulates handedness CPL signals, thereby facilitating successful implementation multidimensional information encryption systems CLCs.

Language: Английский

Revealing the excited-state mechanisms of the polymorphs of a hot exciton material DOI Creative Commons

Ziqi Deng,

Chao Huang, Yunfeng Luo

et al.

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: Jan. 2, 2025

As the investigation of high efficiency thermally activated delayed fluorescence (TADF) materials become more mature, regulating emission properties for single organic luminescence molecules has gained increasing interest recently. Herein, donor-acceptor compounds F-AQ comprised fluorene and anthraquinone is reported, it exhibits a polymorphism with muti-color TADF from high-level intersystem crossing (hRISC). The photodynamics excited-state transient species were studied by femtosecond absorption (fs-TA) spectroscopy. result, an unambiguous signal through space charge transfer (TSCT) was observed in fs-TA spectra crystal π-π interaction between groups, whereas other amorphous solids only show conventional deactivation pathway hRISC-TADF. In this study, we successfully realize direct observation morphism-dependent TSCT crystal, which provides observations solid-state ultrafast dynamics deepens insight into design potential mechanochromic thermochromic utilization molecules. There hot exciton multi-colour solid states luminescent Here, authors report on polymorph dependent differences behaviours.

Language: Английский

Citations

0
Single-Component Thioxanthone-Based Photoinitiator for Free-Radical Photopolymerization of Acrylates via UV-LED Irradiation DOI
Saihe Yang, Pengzhong Chen,

Haichao Fu

et al.

Dyes and Pigments, Journal Year: 2025, Volume and Issue: unknown, P. 112640 - 112640

Published: Jan. 1, 2025

Language: Английский

Citations

0
Pyrazino[2,3‐f][1,10]phenanthroline Derivatives for Oxygen‐Tolerant Dual Photoredox/Copper Catalyzed Atom Transfer Radical Polymerization with Ultra‐low Catalyst Dosage DOI Open Access

Wanchao Hu,

Bei Liu, Shiyi Li

et al.

Chinese Journal of Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: March 20, 2025

Comprehensive Summary Substantial progress has been made over recent years in visible light‐driven dual photoredox/copper catalyzed atom transfer radical polymerization (photo‐ATRP) through the design of photocatalysts (PCs) and optimization reaction conditions. However, it remains challenging to achieve efficient photo‐ATRP with low loadings both photocatalyst copper(II). In this study, two donor‐acceptor organic PCs based on pyrazino[2,3‐ f ][1,10]phenanthroline were successfully used Cu(II)‐mediated photo‐ATRP. These exhibit excellent light absorption capabilities thermally activated delayed fluorescence (TADF) properties. Under blue irradiation, facilitated highly oxygen‐tolerant an extremely catalyst loading (50 ppb). This system demonstrated a broad applicability various monomers, achieving successful methacrylates, acrylates, styrene. Additionally, large scale (250 mL) was achieved, resulting narrow molecular weight polymers high monomer conversions chain‐end fidelity. work provides in‐depth investigation into regulatory process photo‐ATRP, offering new insights intricate mechanism oxygen tolerance.

Language: Английский

Citations

0
Through-Space Electron Effect Regulated Selective Expression of Ultralong Organic Room Temperature Phosphorescence and Photochromism DOI
Lin Han, Youshi Lan,

Xingda Zhang

et al.

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: April 16, 2025

We report a through-space electron effect (TSEE) between two phosphorescent units that significantly modulates the selective expression of ultralong organic room-temperature phosphorescence (UORTP) and photochromism. A series molecules (DNapTr, DNapBNT, DNapFL, DNapPy), featuring connected by nonconjugated spacer, were synthesized. Our findings reveal both TSEE energy gap ΔE (defined as EPU2 - EPU1) lowest triplet levels (T1) play crucial roles in determining UORTP photochromic behavior PMMA films. NMR spectra molecular simulations confirm presence TSEE, with their strength ranked DNapPy < DNapFL DNapBNT TSEE. The DNap unit is governed where moderate inhibits radical cation formation, while strong promotes it. Consequently, DNapTr, exhibit tunable photochromism, whereas remains nonphotochromic. jointly influenced ΔE. For DNapTr (ΔE > 0), excitons are trapped via leading to from DNap. In slightly <0), directs PU2. ≪ enables Py. By leveraging tuning T1 PU2, we successfully modulated photochromism UORTP. This study provides strategy for designing intelligent materials.

Language: Английский

Citations

0
Space-confined charge transfer turns on multicolor emission in metal-organic frameworks via pressure treatment DOI Creative Commons
Ting Zhang, Yanfeng Yin, Xinyi Yang

et al.

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: May 5, 2025

Single-component multi-emissive materials with stimuli-responsive properties offer unique advantages in the field of multicolor-tunable photoluminescence (PL). However, precisely modulating emission each component and achieving high-efficiency present a formidable challenge. Herein, we demonstrate that space-confined charge transfer (CT) turns on bright blue-green-white initially faintly emissive metal-organic frameworks (MOFs) at ambient conditions through pressure treatments. Pressure treatments induce transition from initial long-range CT to mode, significantly amplifying radiative transitions. Furthermore, CT, which occurs between mutually perpendicular ligands, influences spin-orbit intersystem crossing. Precise tuning kinetics via multi-level allows us modulate fluorescence-to-phosphorescence ratio, target MOFs. Our work advances development smart PL unlocks potential for their application atmospheric environments.

Language: Английский

Citations

0
ONOO- regulating ICT of mitochondria-targeted photosensitizers to enhance Type-I photochemical reactions DOI
Beidou Feng, Xin Li, Yiting Yang

et al.

Sensors and Actuators B Chemical, Journal Year: 2024, Volume and Issue: unknown, P. 136810 - 136810

Published: Oct. 1, 2024

Language: Английский

Citations

1
Enhanced Circularly Polarized Luminescence Modulation Using Dichroic Conjugated Polymer in Cholesteric Liquid Crystals DOI Open Access

Yihan Chen,

Lulu Li, Kun Yao

et al.

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

Published: Dec. 25, 2024

Abstract Negative dichroic dyes are crucial for enhancing the brightness of liquid crystal displays (LCDs) and modulating circularly polarized luminescence (CPL) in cholesteric crystals (CLCs) through supramolecular co‐assembly. However, majority fluorescent molecules exhibit positive dichroism, there is a limited understanding designing negative molecules. In this paper, novel design principle proposed to construct polymer by introducing space charge transfer (TSCT) side chain structure backbone. Specifically, two conjugated polymers (P1, P2) synthesized using Suzuki coupling reaction donor‐acceptor (D‐A) type monomers (V‐type M1 I‐type M2) with fluorenyl monomer. P1 exhibits its orientational order parameter (S F ) up S FP1 = –0.18. On contrary, P2 dichroism ( FP2 + 0.27). This variation arises from differing orientations rigidly functional chains FM1 0.07; FM2 0.31), which affect alignment (parallel or perpendicular) backbone toward CLCs phenomenon facilitates controllable precisely modulates handedness CPL signals, thereby facilitating successful implementation multidimensional information encryption systems CLCs.

Language: Английский

Citations

1