Photoexcitation Dynamics of Thiophene–Fluorene Fluorophore in Matrix Encapsulation for Deep-Blue Amplified Spontaneous Emission

Han, Yamin; Sun, Chen; Bai, Lubing; Lin, Jinyi; Xu, Man; Liu, Yuyu; Ding, Xue-Hua; Xie, Linghai; Shen, Kang; Qin, Tianshi; Huang, Wei

doi:10.1021/acsapm.0c01092

Cited by 7 publications

(2 citation statements)

References 48 publications

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“…[68,69] Recently, Huang's group prepared several Th-based diarylfluorene fluorescent emitters (39-44) (Scheme 6) and encapsulated them in the polystyrene (PS) matrix system (Figure 1c,d). [15,70,71] A photophysical properties study of solution, neat film, and blend film were carried out systematically, revealing that their luminous performance were substantially enhanced because of the inhibition of intermolecular aggregation. Compared with pure films without ASE process, the encapsulated compounds produced remarkable optical gain characteristic.…”

Section: Diarylfluorene Fluorescent Small Moleculesmentioning

confidence: 99%

Diarylfluorene‐Based Organic Semiconductor Materials toward Optoelectronic Applications

Han

Bai

Lin

et al. 2021

Adv Funct Materials

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reorganizing these two types of π orbitals, thus endowing the active films with significantly different optoelectronic property. In order to design high-performance and stable conjugated molecules, some basic principles should be followed, such as electronic structure, conformation and topology, steric hindrance, as well as supramolecular interaction, which also called four fundamental nodes proposed by Huang group. [8] Particularly, steric hindrance design is an effective strategy to enhance device performance and stability via adjusting the spatial arrangement of active molecular bricks, the morphology of films, and the fine optoelectronic properties. [9,10] The sterically hindered groups are capable to rotate the dihedral angles of the adjacent monomer units, which can inhibit interchain interactions and further reduce aggregation. In addition, the rigid bulks are favorable for improving the morphological and emission spectral stability of light-emitting conjugated polymers in solid state. Besides, beyond the intrinsic electronic structures, molecular conformation and topology is a crucial for precisely tuning the physical process, controlling film morphology, device performance, and stability.Similar to the industrial manufacturing, modular production of conjugated materials enable them to present a precise electron-structure tunability, controllable structural modification, and low-cost large-scale preparation, similar to Lego building block. In the last decades, amounts of building blocks, such as fluorene, carbazole (Cz), thiophene (Th), and benzothiadiazole, have been employed to design various conjugated molecules for specific applications. [11][12][13][14][15] Among these synthons, fluorene-based bulks have been widely reported to construct high performance organic semiconductors for efficient optoelectronic devices, owing to their easy chemical modification, stable thermodynamic property, high fluorescence quantum yield, and appropriate charge transport capability. [16][17][18][19] Nevertheless, the conventional fluorene units suffer from poor color purity and luminous stability due to significantly interchain aggregation and photo-/electro-oxidation of the alkyl pendant groups at C9 position, which restricted their actual development. [20] The appearance of diarylfluorene structure provides a broader space for the design and preparation of blue emitters with higher purity and efficiency. In 1905, the simplest diarylfluorene (9,9′-diphenylfluorene) was synthesized by Ullmann and Wurstemberger for the first time. [21] As a most promise and popular alternative, diarylfluorene is a non-planar architecture

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Section: Diarylfluorene Fluorescent Small Moleculesmentioning

confidence: 99%

Diarylfluorene‐Based Organic Semiconductor Materials toward Optoelectronic Applications

Han

Bai

Lin

et al. 2021

Adv Funct Materials

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“…They can be used for bottom-up synthesis to solutionprocessable nanographenes with band gap tunability for optoelectronic applications. [10][11][12] Polymers containing PAHs range from completely amorphous to crystalline nature and have attracted attention for the development of supercapacitors, 13 transistors, 14 solar cells, 15 semiconductor, 10 blue-light emitting lasers, 16 photovoltaics 17 etc. Numerous reports exist on stable red and green light-emitting devices.…”

Section: Introductionmentioning

confidence: 99%

Triphenylene containing blue-light emitting semi-fluorinated aryl ether polymers with excellent thermal and photostability

Shelar

Mukeba

et al. 2022

Mater. Chem. Front.

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Light‐Emitting Device Based on Amplified Spontaneous Emission

Feng

Sun

et al. 2023

Laser & Photonics Reviews

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In recent years, with the rapid development of military, optical communication, biological imaging, and other fields, practical engineering applications such as fiber‐optic gyroscope, wavelength division multiplexing, and optical coherence tomography have put forward higher requirements on light sources. Amplified spontaneous emission (ASE) light source has become an excellent candidate due to its advantages such as suitable bandwidth, low coherence, and high power. Although the ASE light source is developed to a certain extent, there is still great room for improvement in the choice of gain medium and device structure. In order to accelerate the development and practical engineering application of ASE optoelectronic devices, it is of great significance to grasp the basic characteristics of the gain materials and the design of the device structure. In this review, the principle of the ASE effect and its difference with the generation of lasing are analyzed. Then, the optical gain properties of various gain materials, together with different structural types of electrically pumped ASE devices and their practical engineering applications, are summarized. Finally, the new ASE light‐emitting devices integrated with high‐gain materials and low‐cost structures are prospected to provide more ideas for their development.

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Photoexcitation Dynamics of Thiophene–Fluorene Fluorophore in Matrix Encapsulation for Deep-Blue Amplified Spontaneous Emission

Cited by 7 publications

References 48 publications

Diarylfluorene‐Based Organic Semiconductor Materials toward Optoelectronic Applications

Diarylfluorene‐Based Organic Semiconductor Materials toward Optoelectronic Applications

Triphenylene containing blue-light emitting semi-fluorinated aryl ether polymers with excellent thermal and photostability

Light‐Emitting Device Based on Amplified Spontaneous Emission

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