Many Exciplex Systems Exhibit Organic Long‐Persistent Luminescence

Nishimura, Naohiro; Lin, Zijian; Jinnai, Kazuhiko; Kabe, Ryota; Adachi, Chihaya

doi:10.1002/adfm.202000795

Cited by 85 publications

(81 citation statements)

References 33 publications

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“…Under external stimulation, the electrons of materials will be transferred from excited state to ground state and then luminescence comes out. [125][126][127] For luminescent semiconductors, the radiative recombination of excitons and Coulomb-bound electron-hole pair states produces luminescence. [128][129][130][131][132] And the electronic band structures determine the final luminescent wavelength.…”

Section: Luminescent Propertiesmentioning

confidence: 99%

Recent Advances in 2D Rare Earth Materials

Chen

Han

Zhao

et al. 2020

Adv Funct Materials

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2D rare earth (RE) materials have received considerable attention in recent years due to the fascinating luminescence, magnetism, and electric properties originated from RE associated with sharp and various emission peaks, intrinsic 2D ferromagnetism, and incommensurate charge density wave. These materials might open up a new prospect in next‐generation lighting, magnetic devices, and phototransistors. Herein, a comprehensive review of 2D RE materials is presented, focusing on their recent progresses. First, the crystal structures of 2D RE materials are discussed. Then, typical synthesis methods such as mechanical exfoliation, molecular beam epitaxy, pulsed laser deposition, and chemical vapor deposition are introduced. Furthermore, various properties in luminescence, magnetism, and electronics are summarized. The recently reported RE‐based 2D novel photodetectors are outlined as three constructions: MoS2/RE, graphene/RE, and perovskite/RE, which show promising applications for both narrow and broad band detection arised from the special absorption windows of different RE elements. Finally, the conclusions and outlook of this area are proposed, such as exploring novel 2D RE compounds, improving stability, and broadening applications.

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Section: Luminescent Propertiesmentioning

confidence: 99%

Recent Advances in 2D Rare Earth Materials

Chen

Han

Zhao

et al. 2020

Adv Funct Materials

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“…[5] Thedelay of fluorescence operates in the microor even to millisecond lifetime range in TADF systems, [6] which thus can meet the requirements of TR fluorescence imaging. [7] Although TR imaging based on TADF probes has been emerging, [8] most of the developed TADF probes produce one emission signal only.T his fact affects the informational integrality of the imaging once the related TR signal is not accessed because of low emission intensity in some local microenvironments.W epropose that ageneral photophysical strategy,i .e.d ual emission characteristic capable of some mutual complementarity,m ight be desirable for TADF probes.T raditionally,e mitters with dual emission have been developed using covalent or noncovalent combinations of different luminophores, [9] or through applying special photophysical mechanisms like excimer/exciplex emission [10] or upconversion. [11] However,t hese strategies can also be restricted by structural mismatching,e mission volatility,a nd mutual energy transfer among the luminophores, [12] which can easily destroy the original TADF properties.W ith respect to these considerations,weaim with this work to achieve adual TADF characteristic employing asingle luminophore,soasto produce an excellent balance of two TADF components for complementary dual-channel lifetime mapping to enhance the TR imaging information.…”

Section: Introductionmentioning

confidence: 99%

Integrating Time‐Resolved Imaging Information by Single‐Luminophore Dual Thermally Activated Delayed Fluorescence

Luo

Ding

et al. 2020

Angewandte Chemie

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The fact that the lifetime of photoluminescence is often difficult to access because of the weakness of the emission signals, seriously limits the possibility to gain local bioimaging information in time‐resolved luminescence probing. We aim to provide a solution to this problem by creating a general photophysical strategy based on the use of molecular probes designed for single‐luminophore dual thermally activated delayed fluorescence (TADF). The structural and conformational design makes the dual TADF strong in both diluted solution and in an aggregated state, thereby reducing sensitivity to oxygen quenching and enabling a unique dual‐channel time‐resolved imaging capability. As the two TADF signals show mutual complementarity during probing, a dual‐channel means that lifetime mapping is established to reduce the time‐resolved imaging distortion by 30–40 %. Consequently, the leading intracellular local imaging information is serialized and integrated, which allows comparison to any single time‐resolved signal, and leads to a significant improvement of the probing capacity.

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“…This power-law emission decay indicates the generation of intermediate charge-separated states and successive gradual charge recombination, which led to LPL. The emission spectra of these lms was attributed to the CT excited states between the donors and acceptors 16,17 .…”

Section: Resultsmentioning

confidence: 99%

“…In contrast to conventional organic room-temperature phosphorescent (RTP) materials 14 , which store their energy in triplet excited states and exhibit radiative transition from the triplet excited states to the singlet ground states 15 , OLPL systems accumulate energy into charge-separated states similar to inorganic LPL materials. LPL and RTP can be identi ed from their emission decay pro les [16][17][18] .…”

Section: Introductionmentioning

confidence: 99%

Air-stable and visible-light-active p-type organic long-persistent-luminescence system by using organic photoredox catalyst

Jinnai

Kabe

Lin

et al. 2021

Preprint

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Organic long-persistent-luminescent (OLPL) materials that exhibit hour-long photoluminescence have advantages over inorganic materials, such as a sustainability, flexibility, and processability. The OLPL materials store the absorbed energy in an intermediate charge-separated state, but this charge-separated state is unstable to oxygen and does not exhibit persistent luminescence in air. The excitation wavelength of OLPL can be controlled by electron-donor and -acceptor materials, but previous materials require absorption mainly in the ultraviolet region. Here, we show OLPL systems that exhibit a persistent luminescence in air and can be excited by a wavelength from 300-nm to 600-nm. By using cationic photoredox catalysts as an electron-accepting dopant, stable charge-separated states are generated by the hole-diffusion process, as opposed to previous OLPL systems that depend on electron diffusion. By using a hole-diffusion mechanism and reducing the energy level of the lowest unoccupied molecular orbital, the OLPL system becomes stable in air and can be excited by visible light. The addition of hole-trapping material increases the LPL duration.

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Many Exciplex Systems Exhibit Organic Long‐Persistent Luminescence

Cited by 85 publications

References 33 publications

Recent Advances in 2D Rare Earth Materials

Recent Advances in 2D Rare Earth Materials

Integrating Time‐Resolved Imaging Information by Single‐Luminophore Dual Thermally Activated Delayed Fluorescence

Air-stable and visible-light-active p-type organic long-persistent-luminescence system by using organic photoredox catalyst

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