ライフサイエンスコーパス: exciton

1 itons) or in two separate layers (interlayer excitons).

2 transported to a region of holes to form an exciton.

3 ely fuse two triplet excitons into a singlet exciton.

4 dden out-of-plane, hence referred to as grey exciton.

5 ing radiative decay of the resulting singlet exciton.

6 cent proteins providing ultra-stable Frenkel excitons.

7 means of electrostatic doping the localized excitons.

8 tive recombination of electrically generated excitons.

9 strongly influenced by the presence of dark excitons.

10 vskite and related compounds to self-trapped excitons.

11 ra, attributed to the polaronic character of excitons.

12 es in semiconductors usually leads to s-wave excitons.

13 ides (TMDs) are determined by strongly bound excitons.

14 ts as a platform to study coherent many-body excitons.

15 asymmetric hybridization with intralayer K-K excitons.

16 e luminescent harvesting of the dark triplet excitons.

17 ttice potentials generate moire minibands of excitons(16-18)-bound pairs of electrons and holes that

18 ly aligned MQWs and from energy down-shifted excitons (2.33 eV) that originate from the locally crump

19 xcited photoluminescence energies: from free-excitons (2.41 eV) coupled to the perfectly aligned MQWs

20 perconductivity(1,2), the formation of moire excitons(3-8) and interlayer magnetism(9).

21 nerates light-matter quasiparticles, such as excitons(6) or plasmons(7), on an attosecond timescale.

22 ctional Chern insulating states(5) and moire excitons(6-9).

23 further observe that inherently strong TMDC exciton absorption resonances may be completely suppress

24 or nanocrystals interfaced with spin-triplet exciton-accepting organic molecules have emerged as prom

25 tal dichalcogenides host a long-lived "dark" exciton, an electron-hole pair in a spin-triplet configu

26 emission rendered by the weakly delocalized exciton and excimer.

27 xciton that deviates from that of the bright exciton and other exciton complexes obtained at cryogeni

28 e and optical absorption-to characterize the exciton and to demonstrate an extremely narrow excitonic

29 such changes to observed lateral patterns of exciton and trion luminescence from WS(2).

30 transfer occurring on timescales between the exciton and trion radiative lifetimes.

31 calized buildup of slow-decaying(14) triplet excitons and charges(15) gradually reduces the brightnes

32 e coupling of the CT-like state with primary excitons and electrochemically induced charge-separated

33 correlation, the nanoscale interplay between excitons and local crystalline structure that gives rise

34 eveals the impact of crystal symmetry on TMD excitons and points to new avenues for realizing topolog

35 nto the interplay between short-lived valley excitons and spin-dependent interlayer tunneling, while

36 direct visual of the momentum-forbidden dark excitons and studied their properties, including their n

37 obtain the effective mass of the interlayer excitons and the electron inter-layer tunneling strength

38 including their near degeneracy with bright excitons and their formation pathways in the energy-mome

39 heory accounting for the composite nature of excitons and trions and deviation of their statistics fr

40 ic-inorganic perovskites with strongly bound excitons and tunable structures are desirable for optoel

41 cting thermal activation and triplet-triplet exciton annihilation processes.

42 The exciton annihilation rates are more than one order of ma

43 ist angles, but also properties of the moire excitons are dependant on, and controllable by, the moir

44 However, a fundamental question-how excitons are electrically generated in individual nanocr

45 These Mott type excitons are highly sensitive to the self-assembly proce

46 ation-induced symmetry breaking, and cluster excitons are only identified in aggregates, as a few exa

47 es, both charge-transfer states and emissive excitons are regenerated, thus setting up an equilibrium

48 zation of static and dynamic disorder at the exciton as well as the molecular level presented here op

49 ve decay of free excitons, bound and trapped excitons as well as electron-hole pairs originating from

50 by the coupling between the charge-transfer exciton at 1.96 eV and a longitudinal optical phonon at

51 to an efficient migration of photogenerated excitons at the crystallite peripheral sites to internal

52 Dynamic triplet-exciton behaviours including thermally activated delayed

53 ical properties, including large and tunable exciton binding energies as computed by the GW-Bethe-Sal

54 ing to materials with small band gaps, large exciton binding energies, and absorption spectra that ar

55 Exciton binding energies, exciton radii, and free-partic

56 optoelectronic properties, including a large exciton binding energy at room temperature and a very sm

57 rgy of 2.394 eV at 7 K and an estimated free exciton binding energy of 150 meV.

58 esden-Popper halide perovskites with a large exciton binding energy, self-assembled quantum wells, an

59 portant target is the tuning of a material's exciton binding energy-the energy binding an electron-ho

60 cies enabled the tuning of the materials' 1s exciton binding energy.

61 the waveguide modes, we detect incoherent A-exciton bleaching along with a coherent optical Stark sh

62 Molecular triplet excitons (bound electron-hole pairs) are 'dark states' b

63 With much smaller mass, excitons (bound electron-hole pairs) are expected to con

64 stently explained by radiative decay of free excitons, bound and trapped excitons as well as electron

65 Photogenerated singlet excitons can be converted to triplet excitons on sub-10-

66 ientation of ground-state Gamma-K interlayer excitons can be flipped with electric fields, while high

67 Importantly, a phonon-mediated exciton cascade from higher energy states to the ground

68 s, strong dispersion and avoided crossing of exciton, cavity photons and plasmon polaritons with effe

69 Herein, we unveil the null exciton character in a series of crystalline Greek cross

70 ated, thus setting up an equilibrium between excitons, charge-transfer states and free charges.

71 ations are a match for previously identified exciton-charge transfer states (Chl(D1) (+)Phe(D1) (-))*

72 , which promotes the formation of hybridised exciton/charge-transfer states at the interface, dissoci

73 Well-confined excitons/charge carriers in a dielectric/quantum well ba

74 Delocalized Frenkel excitons-coherently shared excitations among chromophore

75 ve the Landau levels originating from phonon-exciton complexes and directly probe exciton-phonon inte

76 hexagonal Brillouin zone - and the resulting exciton complexes in the monolayer semiconductor WSe(2).

77 es from that of the bright exciton and other exciton complexes obtained at cryogenic temperatures.

78 s in two-dimensional semiconductors, such as exciton condensates(21) and Bose-Hubbard models(22), and

79 Our study provides evidence for interlayer exciton condensation in two-dimensional atomic double la

80 eable "wings", allowed for the generation of exciton Cotton effects in the region of (1)B(b) electron

81 t external magnetic field in monolayer WS(2) excitons coupled to a nontrivial photonic crystal protec

82 The sign of the exciton couplets observed for inductor-reporter systems

83 Charge-transfer excitons (CTEs) immensely enrich property-tuning capabil

84 2PA-PL excitation is suggested to arise from exciton dark states which extend below the bandgap.

85 After photoexcitation, the COF-5 exciton decays via three pathways: (1) excimer formation

86 bsorbers) motivated us to assess the role of exciton delocalization in the activation of this process

87 The magnitude of exciton delocalization induced by the NHC (after scaling

88 he ethano-bridged picenophane shows the weak exciton delocalization while the cis-ethylene-bridged pi

89 Increasing the degree of coherence, i.e., exciton delocalization, via supramolecular architectures

90 core and organic ligand shell by so-called "exciton-delocalizing ligands (EDLs)" is a promising stra

91 ment confirmed that the coupling between the excitons depends on the specifics of the calix[n]phyrin

92 disentangle quantum-well-thickness-dependent exciton diffusion and annihilation in two-dimensional pe

93 This study provides guidance to manipulate exciton diffusion by modifying organic cations in layere

94 ient photocurrent measurements, indicates an exciton diffusion coefficient at least 36 m(2) s(-1), wh

95 The exciton diffusion constant is found to increase with qua

96 annihilation rates are often convoluted with exciton diffusion constants.

97 rge-transfer rates from morphology-dependent exciton diffusion for a series of polymer:NFA systems.

98 These results reveal that exciton diffusion in COF-5 is constrained by its crystal

99 samples, which reveal domain-size-dependent exciton diffusion kinetics.

100 The short exciton diffusion length associated with most classical

101 Here, we measure the exciton diffusion length in a wide range of nonfullerene

102 Large singlet exciton diffusion lengths are a hallmark of high perform

103 polar charge transport and surprisingly long exciton diffusion lengths in the range of 20 to 47 nm.

104 0.03 cm(2) s(-1), which leads to long-range exciton diffusion over hundreds of nanometers.

105 tion is revealed to significantly affect the exciton diffusion process, determined by temperature-dep

106 inescence mapping, it is found that in-plane exciton diffusivities in layered perovskites are sensiti

107 n, via supramolecular architectures enhances exciton diffusivities up to 1 order of magnitude.

108 ty and octahedral distortion yields a record exciton diffusivity of 1.91 cm(2) s(-1) and a diffusion

109 icial LHCs, but that to achieve an efficient exciton displacement, appropriate topology-guided assemb

110 nveil the key factors that control efficient exciton displacements within MOFs, we first developed li

111 lving charge and energy transfer, as well as exciton dissociation and charge recombination.

112 show that poor charge transport rather than exciton dissociation is the primary reason for the reduc

113 k, we demonstrate the reversible switch from exciton dissociation to exciton funneling in a MoSe(2)/W

114 high-efficiency broadband light absorption, exciton dissociation, and carrier transfer.

115 cies (<4%) owing to limitations such as poor exciton dissociation, limited photon harvesting, and hig

116 These dark excitons dominated the excited-state distribution, a sur

117 es) that can later recombine to form singlet excitons during the phosphorescence spectrum measurement

118 calculations, we are able to rationalize the exciton dynamics and draw basic chemical design rules, p

119 iabatic dynamics is commonly associated with exciton dynamics and photophysics involving charge and e

120 The exciton dynamics are dominated by spin-related electroni

121 femtosecond pump-probe spectroscopy suggests exciton dynamics being more anisotropic in AB stacking,

122 Exciton dynamics can be strongly affected by lattice vib

123 orrelation between the quantum coherence and exciton dynamics in light-harvesting protein complexes a

124 In this study, exciton dynamics of a two-dimensional covalent organic f

125 Cs) provides a unique platform to manipulate exciton dynamics.

126 (IO-MQWs) show utility from room-temperature exciton emission features (binding energies ~200-250 meV

127 This sub-single exciton ensemble-averaged gain threshold of (N(g))~ 0.84

128 itivity to the dielectric environment of the exciton excited states in a single-layer semiconductor o

129 Furthermore, exciton-exciton annihilation processes are characterized

130 PA-PL) suggests saturation of absorption and exciton-exciton annihilation, with typical reduction in

131 insights have shown that two different dark excitons exist within the light cone.

132 rated materials, exemplified here by singlet exciton fission followed by separation into weakly bound

133 Singlet exciton fission photovoltaic technology requires chromop

134 However, the formation dynamics of excitons following non-resonant photoexcitation of free

135 valley scattering of quasi particles in both exciton formation and relaxation.

136 ese results set an ultimate timescale of the exciton formation in TMDs and elucidate the exceptionall

137 ital to providing an accurate description of exciton formation, evolution, and decay.

138 Unlike these conventional excitons formed from extended Bloch states(4-9), exciton

139 ce with a large Stokes shift to self-trapped excitons, forming due to strong carrier-phonon interacti

140 ilibrium Bogoliubov theory, depending on the exciton fraction in an exciton polariton.

141 al that ultrafast (~50 fs) modulation of the exciton frequencies governs spectral broadening.

142 versible switch from exciton dissociation to exciton funneling in a MoSe(2)/WS(2) heterostructure, wh

143 Furthermore, we demonstrate that the triplet excitons generated in the lanthanide nanoparticle-molecu

144 a result, in the rear subcell, the number of excitons generated on large-bandgap donors will be reduc

145 -dot light-emitting diodes demonstrates that exciton generation at the ensemble level is consistent w

146 sm of sequential electron-hole injection for exciton generation in nanocrystal-based electroluminesce

147 his article, we construct and analyze a spin-exciton hamiltonian to describe the dynamics of the two-

148 splitting a singlet exciton into two triplet excitons, has been proposed as a mechanism for improving

149 SWCNT structure suggests that (7,6) triplet excitons have an energy near 970 meV.

150 rting singlet excitons into pairs of triplet excitons, have potential as photovoltaic materials.

151 r array of porphyrin molecules that dictates exciton hopping and excimer formation at ratios as high

152 The discovery of the spin-orbit-entangled exciton in antiferromagnetic NiPS(3) introduces van der

153 calization breaks the symmetry and traps the exciton in one branch.

154 of a Bloch surface wave photon and molecular excitons in a disordered organic thin film at room tempe

155 Here, we probed the momentum state of excitons in a tungsten diselenide monolayer by photoemit

156 direct observation of layer-hybridized moire excitons in angle-aligned WSe(2)/WS(2) and MoSe(2)/WS(2)

157 generation, control and transfer of triplet excitons in molecular and hybrid systems is of great int

158 ptical imaging and spectroscopic analysis of excitons in nanobubbles of monolayer WSe(2) with atomist

159 The formation of excitons in OLEDs is spin dependent and can be controlle

160 non, we study charge separation from triplet excitons in polycrystalline pentacene using an electroch

161 ma and show the formation of two-dimensional excitons in single-layer MoS(2) on the timescale of 30 f

162 de modes to examine photo-induced changes of excitons in the prototypical vdW semiconductor, WSe(2),

163 ansition dipole moment orientation of bright excitons in the superlattices is predominantly in-plane

164 en the surface plasmon polaritons (SPPs) and excitons in the WSe(2) to give a 73 % change in transmis

165 is the dominant formation mechanism of T(1) excitons in this system, which can be explained by consi

166 can be exploited to excite localized charged excitons in tungsten diselenide.

167 Excitons in two-dimensional (2D) materials are tightly b

168 increased the electrostatic screening of the exciton, in turn lowering its binding energy relative to

169 pic signatures of the multipolar delocalized exciton, including the S(2) <- S(1) electronic transitio

170 ion of driving force for singlet and triplet excitons, including inverted regimes for the dissociatio

171 Phonon-exciton interaction lifts the inter-Landau-level transit

172 sting strong many-body effects on the phonon-exciton interaction.

173 as an intriguing playground to study phonon-exciton interactions and their interplay with charge, sp

174 fission, the process of splitting a singlet exciton into two triplet excitons, has been proposed as

175 sion events that ultimately fuse two triplet excitons into a singlet exciton.

176 nd electron-accepting (A) materials to split excitons into charges.

177 he exciton-phonon interactions by quantizing excitons into discrete Landau levels, which is largely u

178 with a type II alignment, but it will funnel excitons into one layer with a type I alignment.

179 undergo singlet fission, converting singlet excitons into pairs of triplet excitons, have potential

180 the efficient extraction of the dark triplet excitons into quantum dots (QDs) where they can recombin

181 In chromophores where the singlet exciton is roughly isoergic with two triplet excitons, t

182 e analysis revealed that the neutral triplet exciton is substantially more delocalized than the posit

183 An exciton is the bosonic quasiparticle of electron-hole pa

184 The retention of exciton isolation even at a short-range coupling regime

185 that many-body interactions among interlayer excitons (IXs) in a WSe(2)/MoSe(2) heterobilayer (HBL) i

186 ic moire potential is much stronger than the exciton kinetic energy and generates multiple flat excit

187 ), orbital magnetic susceptibility(6,7), the exciton Lamb shift(8) and the non-adiabatic anomalous Ha

188 able platform to realize coupled electron or exciton lattices unavailable before.

189 Here, we show sub-single exciton level of optical gain threshold in specially eng

190 e dominance of homogeneous broadening at the exciton level results from exchange narrowing of strong

191 mass model for these materials, in which the exciton levels are strongly correlated through a common

192 tly amplified circular dichroism arises from exciton-like interactions between the perylene-diimide a

193 and theoretical insights into strain-induced exciton localization on length scales commensurate with

194 are inherently disordered, exhibiting strong exciton localization.

195 These excitons manifest a hallmark signature of strong couplin

196 ploring condensate-based optoelectronics and exciton-mediated high-temperature superconductivity(13).

197 icular crystal axes, which hinders efficient exciton migration.

198 ibit topology-dependent pai transmission and exciton migration; these key fundamental pai functions a

199 n kinetic energy and generates multiple flat exciton minibands.

200 ns) and thereby realize exceptionally strong exciton-Mn exchange coupling with g-factors of ~600.

201 Using multiscale exciton modeling, we show that the dominance of homogene

202 CT character and the consequent loss of null exciton/monomer-like properties.

203 lley phonons, we also uncover an intervalley exciton near charge neutrality.

204 e found that fast oxidative quenching of the exciton occurs (picoseconds) in the presence of an elect

205 uire both large accessible surface areas and excitons of suitable energies and with well-defined spin

206 low defect concentrations reveals localized excitons on length scales of around 10 nm at multiple si

207 incoherent transport of delocalized singlet excitons on pico- to nanosecond time scales in single su

208 singlet excitons can be converted to triplet excitons on sub-10-picosecond timescales with unity effi

209 the way to the next generation of integrated exciton optoelectronic nano-devices and applications in

210 reside either in a single layer (intralayer excitons) or in two separate layers (interlayer excitons

211 tifying materials that are able to transport excitons over longer distances can help advancing our un

212 ures used and the delicate nature of Frenkel excitons, particularly under mildly changing solvent con

213 Apart from exciton-phonon coupling, the octahedral distortion is re

214 phonon-exciton complexes and directly probe exciton-phonon interaction under a quantizing magnetic f

215 ane magnetic field is expected to modify the exciton-phonon interactions by quantizing excitons into

216 ms that couple their elementary excitations (excitons, phonons) to their macroscopic mechanical modes

217 igger and control interactions with photons, excitons, phonons, polarons, electrons, holes, spins, io

218 sity dependent two-photon absorption induced exciton photoluminescence (2PA-PL) from these IO-MQWs, e

219 The microcavity hosts strongly coupled exciton-photon modes (exciton polaritons) that are subje

220 Topological polaritons, i.e., hybrid exciton-photon quasiparticles, have been proposed to dem

221 ontrol of excitonic modes, paving the way to exciton-photonics.

222 newidth, and could enable the exploration of exciton physics and optoelectronic applications.

223 ory, depending on the exciton fraction in an exciton polariton.

224 observe quantum depletion of a high-density exciton-polariton condensate by detecting the spectral b

225 ation branch shows that quantum depletion of exciton-polariton condensates can closely follow or stro

226 s have also been observed in non-equilibrium exciton-polariton condensates in planar semiconductor mi

227 even more challenging in driven-dissipative exciton-polariton condensates, since their non-equilibri

228 The delocalized exciton-polariton has a group velocity as high as 3 x 10

229 We find the ratio of trion- to neutral exciton-polariton interaction strength is in the range f

230 results reveal beyond mean-field effects of exciton-polariton interactions and call for a deeper und

231 band-structure engineering in an all optical exciton-polariton lattice.

232 wn to support both propagating and localized exciton-polariton modes.

233 The demonstration of ultralong-range exciton-polariton transport at room temperature promises

234 The use of exciton polaritons (interacting photons) opens up possib

235 hosts strongly coupled exciton-photon modes (exciton polaritons) that are subject to photonic spin-or

236 On chip, exciton-polaritons emerged as a promising system to impl

237 ealized in semiconductor microcavities using exciton-polaritons, solid-state quasi-particles with a l

238 en considering all kinetic factors governing exciton population dynamics.

239 n that dephases and relaxes to an incoherent exciton population reproduces the experimental dynamics

240 avenues in analyzing and predicting dynamic exciton properties, such as excitation energy transport.

241 ence of pentacene centric Kasha's ideal null exciton, providing novel insights toward design strategi

242 Exciton binding energies, exciton radii, and free-particle bandgaps are also deter

243 Both laser excitation and exciton recombination in the 2DC semiconductor launch pr

244 t in emission peak wavelength, a decrease of exciton recombination time, and importantly a significan

245 phases, maximize charge transport and avoid exciton recombination.

246 Exciton relaxation dynamics in TMDs have been extensivel

247 Here we show that not only are moire excitons robust in bilayers of even large twist angles,

248 Strongly confined excitons show distinctly different one- and two-photon e

249 alization on length scales commensurate with exciton size, realizing key nanoscale structure-property

250 Tuning the sign and magnitude of the valley exciton splitting offers opportunities for control of va

251 Here we show that a spin-orbit-entangled exciton state appears below the Neel temperature of 150

252 Bose-Einstein condensation of this exciton state has long been the subject of speculation i

253 cal CrBr(3) magnetization, while the neutral exciton state remains insensitive to the ferromagnet.

254 eterostructures that manifest strongly bound exciton states at room temperature also exhibit emergent

255 Triplet exciton states of the molecules can undergo energy trans

256 dephasing is observed between the first two exciton states, despite their shared electron state and

257 ally polarized magnetic sublevels of the two-exciton states, making it possible to realize quantum ga

258 noscale confinement potentials and localized exciton states.

259 ructural fluctuations cause the self-trapped excitons (STEs) to experience a wide range of energies,

260 ly obtain the radiation pattern of this grey exciton that deviates from that of the bright exciton an

261 luorescence arising from upconverted triplet excitons that are directly created through energy transf

262 i) the formation of delocalized and emissive excitons that enable small non-radiative voltage loss, a

263 s between the magnetic ions and intrinsic QD excitons that have been exploited for color conversion,

264 glet fission produces two low-energy triplet excitons that have been unexpectedly difficult to dissoc

265 exciton is roughly isoergic with two triplet excitons, the limiting step is the triplet-triplet annih

266 The exciton then decays and creates a single optical photon

267 ybridization can also mix these two types of exciton to combine their strengths(13,19,20).

268 des sufficient statistical space for triplet excitons to separate and avoid annihilation-and a subseq

269 nneling to long-range hopping during triplet exciton transfer from CdSe nanocrystals to anthracene is

270 xciting these structures drives spin-triplet exciton transfer from silicon to anthracene through a si

271 Our demonstration of spin-triplet exciton transfer from silicon to molecular triplet accep

272 -confined 2D electronic structure aligns the exciton transition dipole moment parallel to the surface

273 ng diodes for improved stability, which need exciton transport along both the in-plane and the out-of

274 ver, it is not clear yet what determines the exciton transport along the in-plane direction, which is

275 Exciton transport and annihilation are two key processes

276 The combination of long-range exciton transport and slow annihilation highlights the u

277 ition metal dichalcogenides (TMDs) result in exciton trapping(2-5), host Mott insulating and supercon

278 magnetism(3), topological edge states(4,5), exciton trapping(6) and correlated insulator phases(7).

279 ing efficient optical transitions of charged excitons (trions) observed in semiconducting transition

280 This suggests a transition from exciton tunneling to hopping, resulting in relatively ef

281 c fields, while higher-energy K-K interlayer excitons undergo field-asymmetric hybridization with int

282 We resonantly drive the quantum dot's exciton using a laser modulated at the mechanical freque

283 t residual Pd clusters quench photogenerated excitons via energy and electron transfer on the femto-n

284 etween system coupling parameters within the exciton-vibrational near-resonance regime.

285 n, the delocalization of the neutral triplet exciton was also determined in the oligomers and compare

286 alvanic effect of the ionized spin-polarized excitons, where spin polarization occurs in the spin-spl

287 the formation of delocalized excited states (excitons), which are critically sensitive to spatio-ener

288 Resolving momentum degrees of freedom of excitons, which are electron-hole pairs bound by the Cou

289 nderlying mechanism of how the lowest-energy excitons, which are the most important for optoelectroni

290 lity could probe the momentum-forbidden dark excitons, which critically affect proposed opto-electron

291 results provide a new way to control triplet excitons, which is essential for many fields of optoelec

292 cross (+)-stacked architecture-mediated null excitons with a charge-filtering phenomenon for the firs

293 parate electrons and holes in the intralayer excitons with a type II alignment, but it will funnel ex

294 the AB and BA domains supporting interlayer excitons with out-of-plane electric dipole moments in op

295 promising strategy to enhance coupling of QD excitons with proximate molecules, ions, or other QDs.

296 istence of both free and deep-level crumpled excitons with some traces of defect-induced trap state e

297 r N levels include local and charge transfer excitons within each dimer.

298 Delocalization of excitons within semiconductor quantum dots (QDs) into st

299 ld scanning optical microscopy revealed that excitons within the cage-like scaffolds are robust, even

300 1) from which Dirac cones emerge(12), and to exciton Zeeman splitting, breaking time-reversal symmetr