The first observation of electron spin polarization in the excited triplet states caused by the triplet-triplet annihilation

Corvaja, Carlo; Franco, Lorenzo; Salikhov, K. M.; Воронкова, В. К.

doi:10.1007/bf03166755

Cited by 9 publications

(13 citation statements)

References 16 publications

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“…[32] On the other hand, the triplet-triplet-annihilation process could cause electron spin polarization, which further amplifies the magnetic-dipole transition moment (m gn ), which would be positive for the increase of g lum values. [36,154] The amplified magnetic-dipole transition moment and depressed electric-dipole moments resulted in the increase of CPL g lum in the TTA-UC system.…”

Section: Photon Upconversion Based On Triplet-triplet Annihilationmentioning

confidence: 99%

“…On the one hand, it is proposed that CPL can be achieved by populating the emitting state indirectly, either by inter‐ or intramolecular radiationless energy transfer, which could significantly influence the μ gn with a negative effect . On the other hand, the triplet–triplet‐annihilation process could cause electron spin polarization, which further amplifies the magnetic‐dipole transition moment ( m gn ), which would be positive for the increase of g lum values . The amplified magnetic‐dipole transition moment and depressed electric‐dipole moments resulted in the increase of CPL g lum in the TTA‐UC system.…”

Section: Strategies For the Enhancement Of Cplmentioning

confidence: 99%

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Circularly Polarized Luminescence in Nanoassemblies: Generation, Amplification, and Application

et al. 2019

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Yutao Sang obtained his B.Sc. and M.Sc. degrees in chemistry from Qingdao University, China. In 2016, he enrolled on a Ph.D. course at the Institute of Chemistry, Chinese Academy of Sciences (ICCAS), under the supervision of Prof. Minghua Liu, where he is currently in his third year. His ongoing research includes supramolecular chirality, chiroptical materials, and symmetry breaking of achiral molecules in gels and related systems. Pengfei Duan received his Ph.D. degree from the Institute of Chemistry, Chinese Academy of Sciences (CAS) in 2011 with Prof. Minghua Liu on chiral selfassembly in colloid and interface chemistry. He was a postdoctoral research fellow with Prof. Nobuo Kimizuka at Kyushu University, working on photon upconversion in self-assembled systems. In 2015, he became a professor at the National Center for Nanoscience and Technology (NCNST). His current research interests focus on photochemistry and photophysics in chiral supramolecular systems.

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Section: Photon Upconversion Based On Triplet-triplet Annihilationmentioning

confidence: 99%

Section: Strategies For the Enhancement Of Cplmentioning

confidence: 99%

Circularly Polarized Luminescence in Nanoassemblies: Generation, Amplification, and Application

et al. 2019

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“…It has been demonstrated that the μ gn could be significantly decreased in radiationless energy transfer process,[1b] which may account for the amplification of g lum in TTA‐UC systems. In addition, the perturbation of m gn in the TTA‐UC process is negligible, because the TTA‐UC process would result in a triplet state pool, and spin polarization of electron could be caused by the paramagnetic triplet state, which would be a positive factor to the dipole transition moment. In the end, the depressed electric dipole moments and electron spin polarization together would significantly enhance g lum .…”

Section: Amplification Of Cpl Through Tta‐based Photon Upconversionmentioning

confidence: 99%

Photon Upconverted Circularly Polarized Luminescence via Triplet–Triplet Annihilation

et al. 2018

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fabrication of CPL-active systems with both large g lum value and high luminescence intensity is of vital importance but remains challenge. Although some chiral lanthanide complexes have been reported to show both high quantum yield and CPL at the same time, it is more common to observe large g lum value accompanied by small luminescence efficiencies in these systems because of the forbidden electric dipole transition, which severely restrict their applications. [8] In contrast to inorganic complexes, purely organic systems seem to be more suitable candidates for CPL study on account of some valuable advantages such as high emission yield, tunable emission wavelengths, and structural variations. [7,9] In spite of relatively low g lum values, various strategies such as encapsulating organic molecules into chiral assemblies [10] or chiral liquid crystals, [11] have been proved to be effective approach for amplifying the g lum values in purely organic systems. In this context, chiral cholesteric liquid crystals have been reported to be able to express high g lum values comparable with that of chiral lanthanide complexes. [12] Recently, we have reported a new example that the g lum value of acceptor molecules could be amplified by energy transfer process in a composite donor-acceptor supramolecular system, which provide a new view to increase the g lum values of purely organic systems. [13] However, in all reported CPLactive systems, a high-energy excitation was required to achieve the circularly polarized emission. On the other hand, photon upconverted systems showing CPL-activity have never been involved.Photon upconversion, the conversion of low-energy light into higher-energy emission, has a wide variety of applications in the fields of photodynamics therapy [14] solar cell energy conversion, [15] bioimaging, [16] photocatalysis. [17] Among all the existing approaches, photon upconversion via triplet-t riplet annihilation (TTA) mechanism is attracting more attention for its various advantages such as noncoherent excitation source and remarkably high efficiency. [18] To date, although photon upconversion has been widely reported, the integration of photon upconversion and CPL in one chiral system to achieve higher-enery CPL emission has never been reported. Herein, we highlight our recent progress on photon upconverted CPL in molecular and assembled systems. Figure 1 illustrates the general idea of this research concept. The triplet excited state (T 1 ) of donor is formed by intersystem crossing (ISC) from singlet excited state. Then, triplet-triplet energy Circularly polarized luminescent materials are of increasing attention due to their potential applications in advanced optical technologies, such as chiroptical devices and optical sensing. Recently, in all reported circularly polarized luminescent materials, high-energy excitation results in lowenergy or downconverted circularly polarized luminescence (CPL) emission. Although photon upconversion-i.e., the conversion of low-energy light into higher-energy em...

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“…For readers’ convenience, I present a selected list of my publications dealing with the main topics of my long-term research: spin chemistry [ 1 – 22 ]; pulse EPR spectroscopy [ 23 – 38 ]; spin exchange [ 39 – 52 ]; and diverse publications [ 53 – 59 ].…”

Section: My Future Plansmentioning

confidence: 99%

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2022

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The first observation of electron spin polarization in the excited triplet states caused by the triplet-triplet annihilation

Cited by 9 publications

References 16 publications

Circularly Polarized Luminescence in Nanoassemblies: Generation, Amplification, and Application

Circularly Polarized Luminescence in Nanoassemblies: Generation, Amplification, and Application

Photon Upconverted Circularly Polarized Luminescence via Triplet–Triplet Annihilation

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