Stabilizing Excited-State of Organic Phosphorescent Photosensitizers via Self-Assembly for Boosting Photoreduction of CO2-to-CO DOI Creative Commons
Zhengxu Cai,

Chenchen Xiong,

Ping Wang

и другие.

Research Square (Research Square), Год журнала: 2024, Номер unknown

Опубликована: Ноя. 15, 2024

Abstract The development of pure organic photosensitizers remains challenging due to low intersystem crossing (ISC) efficiency and the instability triplet excitons. Herein, a series phosphorescent molecules are prepared as photosensitizers. extensive conjugation fused-ring cores enhances visible-light absorption, while heteroatom-rich structures promote ISC process, effectively generating 2,3,5,6,9,10-Hexabutoxy-8-phenyldithieno-triphenyleno-pyridine (TPy) exhibits high can sensitize Fe-catalyst efficiently for photoreduction CO2-to-CO. A novel strategy doping into core amphiphilic nanoparticles (NPs) formed by polystyrene-block-poly(ethylene glycol) (PS-b-PEG) was further developed. PS, NPs, stabilize excitons generated TPy its rigid polymer backbone, resulting in enhanced photocatalytic efficiency. Meanwhile, PEG serves corona improving stability dispersibility. Notably, this self-assembled increases sensitization (TONCAT = 2041, 51.02 µmol CO) nearly 50%, even after three catalytic cycles, 93.5% original ability is retained. This result opens new avenue developing molecular stabilizing their excited-states efficient application photoredox reactions.

Язык: Английский

Sulfur Lone Pairs Open Avenues for π* → n Orange-to-Red TADF and OLEDs DOI
Hao Sun, Xuping Li, Chao‐Hsien Hsu

и другие.

Journal of the American Chemical Society, Год журнала: 2025, Номер 147(6), С. 5432 - 5439

Опубликована: Янв. 31, 2025

It is always important and fascinating to explore new organic emitters that exploit unconventional pathways unveil their emission with unique properties, such as thermally activated delayed fluorescence (TADF). In this study, we report the rarely explored sulfur lone pair (n) a promising alternative, where correlated π* → n can be used attain strong TADF thus practical OLEDs. The designed strategy incorporates several key concepts (Figure 1a), in which persulfide aromatic spirocycle enhances spin-orbit coupling, thereby increasing intersystem crossing rate. Next, molecules twisted donor-acceptor configuration bridged by spiro[4.4]nonane well spatially orthogonal pairs features significantly reduce singlet-triplet gap. Finally, rigid spirocyclic backbone inhibits nonradiative transitions. proof-of-concept given compound 1, achieves nπ* (TADF) maximized at 635 nm photoluminescence quantum yields high 52% CH2Cl2. Wet-processed OLEDs containing 1 achieved maximum external efficiency of 6.4% brightness 189 cd m-2 (∼600 nm), opening an alternative 1nπ* route for

Язык: Английский

Процитировано

2
Construction of Cross‐Linked Polymer Phosphorescence by Functionalization of Cyclotriphosphazene DOI Open Access

Meiyi He,

Ting Tan,

Hui Hou

и другие.

Advanced Optical Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 28, 2025

Abstract In recent years, organic room‐temperature phosphorescence (RTP) materials have garnered significant research interest. However, the design and synthesis of novel polymeric RTP systems continue to pose substantial challenges. By leveraging cyclotriphosphazene functionalization, four phosphors are successfully developed. The presence numerous heteroatoms (O, N, P) within this structure significantly enhances molecular spin‐orbit coupling (SOC). Initially, incorporation these into a polyvinyl alcohol (PVA) matrix yielded only weak emissions. Remarkably, thermal annealing transformed long‐lived cross‐linked polymer films. Specifically, representative luminescent film (THMD@PVA) exhibits enhancements in intensity, lifetime, afterglow brightness, quantum yield by factors 8, 4, 18, 6, respectively. With superior mechanical luminescence properties, well‐suited for creating flexible reconfigurable 3D objects. Furthermore, dual fluorescent phosphorescent emissions expands their applicability, including fingerprint recording, thereby broadening application scope materials.

Язык: Английский

Процитировано

1
Photoactivated Circularly Polarized Room‐Temperature Phosphorescence from Phenoselenazine Derivative and Its Application in Information Security† DOI

Shiyao Fu,

Yi Chen, Yujun Xie

и другие.

Chinese Journal of Chemistry, Год журнала: 2024, Номер unknown

Опубликована: Июнь 11, 2024

Comprehensive Summary Room‐temperature phosphorescence (RTP) materials have experienced rapid development due to their potential in organic light‐ emitting diode, information security, bioimaging, etc . However, the design of chiral phosphors with circularly polarized RTP (CPP) property remains a formidable challenge. Here, we introduce perturbation approach using combination binaphthol and phenoselenazine derivative achieve CPP. The photoactivated CPP polystyrene (PS) film demonstrates luminescence dissymmetry factor ( g lum ), emission efficiency, lifetime up 9.32 × 10 –3 , 27.0%, 40.0 ms, respectively. remarkable sensitivity PS oxygen temperature enables adjustable colors, ranging from green offwhite blue under varying conditions. doping systems, utilizing hosts triphenylphosphine 9‐phenylcarbazole, demonstrate an extended 85.9 ms exhibit persistent mechanoluminescence low pressure response threshold as 0.15 N. security provided by this material was attained via diverse colors afterglow generated distinct UV irradiation times host materials. Alternately, it can also be achieved observing different patterns R ‐ L ‐polarizer. research has presented reliable for producing high efficiency

Язык: Английский

Процитировано

6
Stimuli‐Responsive Dual‐Emission Property of Single‐Luminophore‐Based Materials DOI
Hao Sun, Shen Shen,

Chenzi Li

и другие.

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Сен. 25, 2024

Abstract Single luminophore enabling stimuli‐responsive dual‐emission characteristic has received considerable interest in recent years due to its special advantages advanced optical events. A large number of reports around the globe have involved dynamic or adjustable phenomenon (e.g., dual emission intensity ratio) single‐emitter based systems. However, a systematic overview summarizing underlying mechanisms, behaviors, and applications this topic is, so far, missing. To further promote development extend important role such kind materials diverse communities, review, latest advancements field single‐luminophore that exhibit characteristics are summarized. The discussion is centered on photophysical innovative design approaches, strategies for modulating properties, these This review anticipated provide new insights into distinctive organic luminescence community from perspective.

Язык: Английский

Процитировано

6
Coordination and light modulated dynamic optical switches of terpyridine-derived spiropyran for time-resolved information encryption DOI

Qingguo Zeng,

Yinghao Zhang, Xin Lei

и другие.

Chemical Engineering Journal, Год журнала: 2024, Номер 497, С. 154274 - 154274

Опубликована: Июль 25, 2024

Язык: Английский

Процитировано

5
Anion-induced opposite mechanochromic and thermochromic emission directions of protonated hydrazones DOI
Cheng Qian,

Lixia Xie,

Lijie Liu

и другие.

Science China Materials, Год журнала: 2024, Номер unknown

Опубликована: Дек. 4, 2024

Язык: Английский

Процитировано

5
Single‐Luminophore Molecular Engineering for Rapidly Phototunable Solid‐State Luminescence DOI
Hao Sun, Zidong Yu,

Chenzi Li

и другие.

Angewandte Chemie International Edition, Год журнала: 2024, Номер 64(1)

Опубликована: Сен. 7, 2024

Smart materials enabling emission intensity or wavelength tuning by light stimulus have attracted attention in cutting-edge fields. However, due to the general limitation of dense molecular stacking (in solid states, especially crystals) on photoresponsivity, constructing rapidly phototunable solid-state luminescent systems remains challenging. Herein, we present a new luminophore that serves as both photoresponsive and luminous group with enhanced conformational freedom attain this goal, namely, relying photoexcitation-induced change an ionized persulfurated arene based weak intermolecular aliphatic C-H⋅⋅⋅π interaction. Together phosphorescence characteristic molecule itself, upon irradiation can be observed series phase like solution state, crystal, amorphous high rate 0.033 s

Язык: Английский

Процитировано

3
Organic Circularly Polarized Room‐Temperature Phosphorescence: Strategies, Applications and Challenges DOI Open Access
Xin Zou, Nan Gan, Yaru Gao

и другие.

Angewandte Chemie International Edition, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 16, 2024

Abstract Organic circularly polarized luminescence (CPL) plays crucial roles in chemistry and biology for the potential chiral recognition, asymmetric catalysis, 3D displays, biological probes. The long‐lived luminescence, large Stokes shift, unique chiroptical properties make organic room‐temperature phosphorescence (CPP) a new research hotspot recent years. Nevertheless, achieving high‐performance CPP is still challenging due to sensitivity complexity of integrating triplet excitons polarization within materials. This review summarizes latest advances CPP, ranging from design strategies photophysical underlying mechanisms applications. Specifically, generating are systemically categorized discussed according interactions between units chromophores. applications light‐emitting diodes, sensing, afterglow information encryption also illustrated. In addition, we present current challenges perspectives on developing CPP. We expect this provide some instructive principles fabricate materials, offering an in‐depth understanding mechanism paving way toward diverse practical

Язык: Английский

Процитировано

3
Aqueous up-conversion organic phosphorescence and tunable dual emission in a single-molecular emitter DOI Creative Commons
Yang Li,

Zizhao Huang,

Ailong Shao

и другие.

Chemical Science, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

A single-molecular emitter Yn was developed, exhibiting aqueous tunable up-conversion RTP/fluorescence dual emission and excellent biocompatibility for two-photon time-resolved imaging ratiometric temperature sensing.

Язык: Английский

Процитировано

0
Lone Pairs-Mediated Multiple Through-Space Interactions for Efficient Room-Temperature Phosphorescence DOI
Fulong Ma, Bo Wu, Siwei Zhang

и другие.

Journal of the American Chemical Society, Год журнала: 2025, Номер unknown

Опубликована: Март 18, 2025

The simultaneous generation and stabilization of triplet excitons are the key to realizing efficient organic room temperature phosphorescence (RTP), which is challenging owing obscure mechanism structure-property relationships. Herein, a strategy lone-pair-mediated multiple through-space interactions (TSIs) proposed availably induce RTP. By incorporating heteroatoms facilitate n-n n-π interactions, lone pairs delocalized throughout structure, resulting in dense splitting excited-state energy levels. Thus, more matched levels with small gap between singlet states (ΔEST) emerge, intersystem crossing (ISC) transition channels that assist generation. strong TSIs also effectively rigidify molecular structures thus stabilize for radiation. Furthermore, manipulation TSI intensity allows efficiency enhancement, persistent time prolongation, tolerance high temperatures This work not only explores fundamental principle RTP from new view but provides universal ISC promotion triple stabilization.

Язык: Английский

Процитировано

0