Organic emitter integrating aggregation-induced delayed fluorescence and room-temperature phosphorescence characteristics, and its application in time-resolved luminescence imaging

Ni, Fan; Zhu, Zece; Tong, Xiaoyong; Xie, Mingyuan; Zhao, Qiang; Zhong, Cheng; Zou, Yang; Yang, Chuluo

doi:10.1039/c8sc01485j

Cited by 115 publications

(76 citation statements)

References 41 publications

(13 reference statements)

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“…Hence, both TADF and RTP can be observed in organic emitter with an appropriate Δ E T1→S1 . This dual emissive phenomenon has been extensively utilized in organic photocatalysis, imaging, etc …”

Section: General Principle In Organic Phosphorescencementioning

confidence: 99%

“…achieved ultralong‐lived organic RTP in π‐orbital‐providing 1,3,5‐triazines derivatives with a lifetime of 1.35 s, but its absolute quantum efficiency is only ≈1.25% . Interestingly, the thermally‐activated delayed fluorescence (TADF), known as an emission triggered through a reverse intersystem crossing (RISC) process from the lowest triplet to singlet excited states, was also observed in some RTP molecules . In this case, the RTP phenomenon becomes more difficult to understand owing to the RISC deactivation process of the triplet excitons.…”

Section: Introductionmentioning

confidence: 99%

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Room‐Temperature Phosphorescence in Metal‐Free Organic Materials

et al. 2019

Annalen der Physik

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Purely organic materials with room-temperature phosphorescence (RTP) have attracted a growing interest for their potential applications in biological imaging, digital encryption, optoelectronic devices, and so on. To date, many strategies have succeeded in designing efficient organic RTP materials by overcoming the spin-forbidden transition between singlet and triplet states. However, the underlying mechanisms of RTP still remain ambiguous. Such spin prohibition in phosphorescence are clarified, herein, from the perspective of perturbation theory, helping to understand the intrinsic relationship among various phosphorescence parameters, like phosphorescence efficiency, lifetime, intersystem crossing rate, as well as radiative and nonradiative rates. Taking into consideration the recent progress in organic RTP materials, these factors are further illustrated by a selection of the most relevant molecules. In addition, some novel RTP phenomena are also reviewed, thus providing an excellent guideline to constructing efficient RTP materials.

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Section: General Principle In Organic Phosphorescencementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Room‐Temperature Phosphorescence in Metal‐Free Organic Materials

et al. 2019

Annalen der Physik

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“…Ta king DPF-BP-DMACa sa ni nstance, the lifetime of the delayed component in neat film (t delayed = 7.8 ms) is longert han that in solution( t delayed = 1.2 ms), which discloses its AIDF property. [15,16] The ratio of delayed components (R delayed )a nd the delayed PL quantum yield (F delayed )o fD PF-BP-DMACi nn eat film (R delayed = 63 %a nd F delayed = 39.3 %) are also higher than those in solution( R delayed = 31 %a nd F delayed = 6.8 %), which corroborates the AIDF characteristic. Whati sm ore, the intersystem crossingr ate constant( k ISC ), the rate constanto ff luorescence (k F )a nd the rate constant of delayedf luorescence( k delayed )a re then estimated based on the PL quantum yields and lifetime data.…”

Section: Photophysical Propertiesmentioning

confidence: 56%

“…[15] AIDF luminogens are free of ACQ problem and can theoretically utilize 100 %o ft he electrically generated excitons, which have great potentialt ob ea ppliedi nn on-doped OLEDs. [15,16] To further develop more efficient AIDF luminogens, herein, an asymmetric donor-acceptor-donor' (D-A-D')e lectronic structure composed of ac arbonyl acceptor( A) and two different donors (D and D')i sp roposed. Although as ymmetric D-A-D molecule can also be an AIDF molecule, which takes the advantage of simplicity, [16b] the asymmetric D-A-D' structure can broaden the diversity of the molecules with delayedf luorescence, which is favored for facilely optimizing their photophysical property,c arrier transporting ability,e lectronic structure and so on, by adoptingv ariousd onor groups in one molecule.…”

Section: Introductionmentioning

confidence: 99%

Aggregation‐Induced Delayed Fluorescence Luminogens for Efficient Organic Light‐Emitting Diodes

Zeng

Guo

Líu

et al. 2018

Chemistry An Asian Journal

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Aggregation‐induced delayed fluorescence (AIDF) can be regarded as a special case of aggregation‐induced emission (AIE). Luminogens with AIDF can simultaneously emit strongly in solid state and fully utilize the singlet and triplet excitons in organic light‐emitting diodes (OLEDs). In this work, two new AIDF luminogens, DMF‐BP‐DMAC and DPF‐BP‐DMAC, with an asymmetric D–A–D′ structure, are designed and synthesized. The characteristics of both luminogens are systematically investigated, including single crystal structures, theoretical calculations, photophysical properties and thermal stabilities. Inspired by their AIDF nature, the green‐emission non‐doped OLEDs based on them are fabricated, which afford good electroluminescence performances, with low turn‐on voltages of 2.8 V, high luminance of 52560 cd m−2, high efficiencies of up to 14.4 %, 42.3 cd A−1 and 30.2 lm W−1, and very small efficiency roll‐off. The results strongly indicate the bright future of non‐doped OLEDs on the basis of robust AIDF luminogens.

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“…Qian's group synthesized a series of chromophores with aggregation‐induced red emission based on triphenylamine‐BODIPY. Furthermore, AIE luminogens had potential application in biological imaging …”

Section: Introductionmentioning

confidence: 99%

CT‐BODIPY with Donor‐Acceptor Architecture: Red‐AIE Property and Selective Interaction with BSA

Huang

Qian

2019

ChemistrySelect

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A dual‐channel chromophore named CT‐BODIPY with through bond energy transfer (TBET) and red aggregation‐induced emission(red‐AIE) characters was designed, consisting of D−A (donor‐acceptor) architecture where boron‐dipyrromethene (BODIPY) core as electron acceptor and coumarin as electron donor. Surprisingly, we found that it was non‐fluorescent in pure DMSO. However, the intensities centered at 626 nm increased apparently with higher water contents and the fluorescence intensities in 95% water contents DMSO/H2O mixtures reached the maximum. Besides, the dye generated red fluorescence in the solid state at 616 nm. These results demonstrated typical aggregation induced red emission. Crystallographic structure analysis attested that large dihedral angle of 77° and intermolecular interaction restricted intramolecular rotation which was the mechanism of AIE character. Dynamic light scattering (DLS) experimental results and transmission electron microscope (TEM) image also demonstrated the formation of aggregates. Importantly, CT‐BODIPY had ability to produce fast detection for bovine serum albumin (BSA) based on AIE and the DLS studies also indicated the change of aggregate diameter. Furthermore, The CT‐BODIPY was applied in dual‐channel MCF‐7 cell imaging which suggested it could be promising in biosensor applications.

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Organic emitter integrating aggregation-induced delayed fluorescence and room-temperature phosphorescence characteristics, and its application in time-resolved luminescence imaging

Abstract: A luminophore integrating aggregation-induced delayed fluorescence and room-temperature phosphorescence for time-resolved luminescence imaging.

Cited by 115 publications

References 41 publications

Room‐Temperature Phosphorescence in Metal‐Free Organic Materials

Room‐Temperature Phosphorescence in Metal‐Free Organic Materials

Aggregation‐Induced Delayed Fluorescence Luminogens for Efficient Organic Light‐Emitting Diodes

CT‐BODIPY with Donor‐Acceptor Architecture: Red‐AIE Property and Selective Interaction with BSA

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