Modulating Triplet Excited States of Organic Semiconductors via Tuning Molecular Conformation for Dual‐ratiometric Thermometers

Chen, Hao; Sun, Yishuo; Liu, Meihui; Li, Fuyou; Peng, Qian; Huang, Hui

doi:10.1002/anie.202302629

Cited by 20 publications

(7 citation statements)

References 59 publications

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“…As demonstrated in Figure S38, BN possessed a small energy gap between singlet and triplet states (ΔE ST ) and large SOC constants (ξ), which facilitated ISC. 62 Also, the transitions of T 1 to T n of BN were most efficient (Table S4), revealing that yielding T n via TTA was possible in BN. characteristics.…”

Section: ■ Results and Discussionmentioning

confidence: 97%

“…Specifically, N and 2BN showed a linear relationship with excitation power, while BN exhibited linear-to-quadratic conversion dependence on the excitation power (Figure S37), indicating that BN was also an anti-Stokes photoluminescence system. As demonstrated in Figure S38, BN possessed a small energy gap between singlet and triplet states (Δ E ST ) and large SOC constants (ξ), which facilitated ISC . Also, the transitions of T 1 to T n of BN were most efficient (Table S4), revealing that yielding T n via TTA was possible in BN .…”

Section: Resultsmentioning

confidence: 98%

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Organic All-Photonic Artificial Synapses Enabled by Anti-Stokes Photoluminescence

et al. 2023

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All-photonic synaptic devices with the merits of visible signals and high spatiotemporal resolution are promising to break the Von Neumann bottleneck. Although organic synapses outperform their inorganic counterpart for easy molecular modulation and lower energy consumption, the organic allphotonic artificial synapse has never been reported. Here, all-photonic synaptic characteristics were unprecedentedly observed in an organic semiconductor, (3,6dimethyl-9H-carbazol-9-yl)(thiophen-2-yl) methanone (S2OC), with anti-Stokes photoluminescence. Impressively, the intensity of fluorescence from the higher excited state (S 3 ) exhibited synaptic performance, which constantly increased with irradiation time through a channel composed of intersystem crossing, triplet− triplet annihilation, and energy transfer. More importantly, the relationship between the molecular structure and synaptic performance was established. Based on the synaptic photoplasticity property, noncontacted multilevel anticounterfeiting and imaging recognition were realized in all-photonic synapse arrays. This work provides a universal strategy for tuning the performances of organic synapses upon regulating the molecular structures, which paves the way for the application of organic semiconductors in artificial intelligence.

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Section: ■ Results and Discussionmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 98%

Organic All-Photonic Artificial Synapses Enabled by Anti-Stokes Photoluminescence

et al. 2023

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“…Meanwhile, the hybrid 1 (n, π*)! 3 (π, π*) transition is another important module for boosting ISC and RTP based on the El-Sayed's rule; [33][34] therefore, functional groups containing out-of-plane electronic transitions such as carbonyls or nitrates are routinely attached to aromatic rings for this purpose. [35][36] Among all organic luminophores, polyaromatic hydrocarbons (PAHs) such as pyrene, despite their natural abundancy in fossil fuels, are yet to be tapped for efficient RTP, for an apparent lack of any significant means to increase SOC or reduce ΔE ST .…”

Section: Introductionmentioning

confidence: 99%

Disorder‐Enhanced Charge‐Transfer‐Mediated Room‐Temperature Phosphorescence in Polymer Media

Cheng,

Su,

et al. 2023

Angew Chem Int Ed

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Room‐temperature phosphorescence (RTP) polymers have important applications for biological imaging, oxygen sensing, data encryption, and photodynamic therapy. Despite the many advantages polymeric materials offer such as great control over gas permeability and processing flexibility, disorder is traditionally considered as an intrinsic negative impact on the efficiency for embedded RTP luminophores, as various allowed thermal motions could quench the emitting states. However, we propose that such disorder‐enabled freedoms of microscopic motions can be beneficial for charge‐transfer‐mediated RTP, which is facilitated by molecular conformational changes among different electronic transition states. Using the “classic” pyrene‐aniline excimer as an example, we demonstrate the mutual enhancement of red/near‐infrared and green RTP emissions from the pyrene and aniline moieties, respectively, upon doping of the aniline polymer with trace pyrene derivatives. In comparison, a pyrene‐doped crystal formed with the same aniline structure exhibits only charge‐transfer fluorescence with no red or green RTP observed, suggesting that order suppresses the RTP channels. The proposed polymerization strategy may be used as a unified method to generate multi‐emissive polymeric RTP materials from a vast pool of known and unknown exciplexes and charge‐transfer complexes.

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“…Long afterglow materials can maintain persistent luminescence after the excitation source is removed. [ 1–4 ] Which have attracted significant attention due to their potential applications in the field of life medicine, [ 5,6 ] optical sensing, [ 7 ] illumination displays, [ 8,9 ] and security encryption. [ 10,11 ] According to the current research, long afterglow luminescent materials can be classified into inorganic and organic longafterglow materials.…”

Section: Introductionmentioning

confidence: 99%

Multicolor Afterglow from Carbon Dots: Preparation and Mechanism

Ran,

Liu,

Zhuang

et al. 2023

Small Methods

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Carbon dots (CDs), as emerging long afterglow luminescent material, have attracted the attention of researchers and become one of the hot topics in long afterglow materials. In recent years, researchers have obtained a series of CDs‐based long afterglow materials with different properties utilizing matrix‐assisted and self‐protective methods. To meet diverse application needs, the development of multicolor CDs‐based long afterglow materials is a focus and challenge in this field. Most of the previously reported CDs‐based long afterglow materials generally emit blue or green afterglow. Recently, some multicolor systems have been discovered, and the emission range can extend from ultraviolet to near‐infrared. However, there is a lack of systematic and in‐depth analysis regarding the preparation strategy and luminescence mechanism of multicolor afterglow from CDs‐based long afterglow materials. Based on this, this review summarizes the preparation strategies of multicolor afterglow from raw materials and reaction parameters. Then, the luminescence mechanisms of multicolor afterglow are analyzed from seven factors, including carbonization degree, surface state, aggregation degree, temperature dependence, excitation dependence, multi‐emission center, and energy transfer. Moreover, the applications of multicolor afterglow from CDs‐based long afterglow materials are introduced. Finally, the problems and challenges in this field are discussed, and the future development directions are analyzed.

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Modulating Triplet Excited States of Organic Semiconductors via Tuning Molecular Conformation for Dual‐ratiometric Thermometers

Cited by 20 publications

References 59 publications

Organic All-Photonic Artificial Synapses Enabled by Anti-Stokes Photoluminescence

Organic All-Photonic Artificial Synapses Enabled by Anti-Stokes Photoluminescence

Disorder‐Enhanced Charge‐Transfer‐Mediated Room‐Temperature Phosphorescence in Polymer Media

Multicolor Afterglow from Carbon Dots: Preparation and Mechanism

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