A simple molecular design towards the conversion of a MCL backbone to a multifunctional emitter exhibiting polymorphism, AIE, TADF and MCL

Huang, Bin; Yu, Wenbing; Yang, Li; Li, Yan; Gu, Ning

doi:10.1016/j.heliyon.2022.e11221

Cited by 3 publications

(2 citation statements)

References 46 publications

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“…The key factor in the evolution of TADF molecules is a narrow energy gap (ΔEST) and a large spin-orbital coupling (SOC) between S1 and T1 to promote the RISC process. Therefore, typical TADF molecules consist of an electron donor (D) and an acceptor (A) to achieve good separation of the frontier orbitals and minimize ΔEST [7]. Mechanochromic luminescent (MCL) materials are a class of "smart" materials whose emission properties can be altered by external force (e.g., grinding, heating, and vapor deposition), and have attracted considerable interest and attention because of their widespread applications, including pressure sensors, security papers, photoelectric devices, and optical data recording [8].…”

Section: Introductionmentioning

confidence: 99%

Mechanochromic luminescent derivatives based on xanthenone and thioxanthenone for the fabrication of OLED devices as emitter layer

Nasiri

Janušas

2023

Smart Materials for Opto-Electronic Applications

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New compounds consisting of xanthenone and thioxanthenone derivatives are synthesized and the photophysical properties of the compounds are discussed in detail. The difference between singlet and triplet energies was obtained at 0.09 and 0.37 eV (at low temperature). Furthermore, the logarithm of the laser power versus the logarithm of the PL intensity showed a slope of less than 1, and the compounds exhibit thermally activated delayed fluorescence (TADF). In addition, the photoluminescence quantum yield of the spin-coated films was gained 51.83 and 41.22%, respectively. The powder X-ray diffraction of the grinded (under the force) compounds and also the PL spectrum of the compounds were shifted and the compounds were mechanochromic when the color of the compounds was changed. The ionization potential of the compounds showed (5.49 and 5.62 eV) that the compounds were well suited for using in the fabrication of OLED devices as an emitter layer. The performance of the OLEDs was investigated and the maximum brightness and external quantum efficiency were found to be 44573 cdm-2 and 12.61%, respectively.

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Section: Introductionmentioning

confidence: 99%

Mechanochromic luminescent derivatives based on xanthenone and thioxanthenone for the fabrication of OLED devices as emitter layer

Nasiri

Janušas

2023

Smart Materials for Opto-Electronic Applications

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“…[18] While a few multifunctional luminescent compounds with TADF features have been synthesized and investigated, only a minority of them are reported with considerable electroluminescence (EL) efficiency. [18][19][20][21][22] The device performances of multifunctional TADF materials still remain unsatisfactory compared to conventional TADF emitters. Hence, the development of high-efficiency multifunctional TADF materials is urgently required, given their vital significance in both theoretical and practical aspects.…”

Section: Introductionmentioning

confidence: 99%

A Strategy for Designing Multifunctional TADF Materials for High‐Performance Non‐doped OLEDs by Intramolecular Halogen Bonding

Ge,

Li,

Guo

et al. 2023

Advanced Optical Materials

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The development of multifunctional thermally activated delayed fluorescence (TADF) material with high efficiency is indeed a formidable challenge. The difficulty arises from the need to achieve multiple desirable radiation pathways simultaneously during the emission process. In this context, a novel strategy to construct multifunctional emitters with high emission efficiency by modulating intramolecular halogen bonding through structural isomerism is proposed. The designed molecule DMAC‐2FDPS exhibits multifunctional features, including aggregation‐induced emission, mechanochromic luminescence, room temperature phosphorescence, mechanoluminescence, and TADF. Notably, in neat film, DMAC‐2FDPS demonstrates an exceptionally high photoluminescence quantum efficiency of up to 93%. Through single‐crystal analysis and theoretical calculations, it is revealed that the intramolecular halogen bonding in this molecule plays a crucial role in achieving both multifunctional emission and high PLQY. Furthermore, when utilized in non‐doped organic light‐emitting diodes (OLEDs), DMAC‐2FDPS achieves a maximum external quantum efficiency of up to 21.2%. To the best acknowledge, it is almost the highest efficiency for non‐doped OLEDs based on multifunctional materials with five characteristics. These results certify a new strategy for the development of high‐efficiency multifunctional TADF materials and devices.

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AIE-active dyes based on Tröger's base: Synthesis and mechanochromic luminescence

Yu,

Guo,

et al. 2024

Dyes and Pigments

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A simple molecular design towards the conversion of a MCL backbone to a multifunctional emitter exhibiting polymorphism, AIE, TADF and MCL

Cited by 3 publications

References 46 publications

Mechanochromic luminescent derivatives based on xanthenone and thioxanthenone for the fabrication of OLED devices as emitter layer

Mechanochromic luminescent derivatives based on xanthenone and thioxanthenone for the fabrication of OLED devices as emitter layer

A Strategy for Designing Multifunctional TADF Materials for High‐Performance Non‐doped OLEDs by Intramolecular Halogen Bonding

AIE-active dyes based on Tröger's base: Synthesis and mechanochromic luminescence

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