Photoluminescence and Near-Edge Optical Absorption in the Low-Temperature Phase of Pristine C<sub>60</sub>Single Crystals

Akimoto, Ikuko; Kanno, K.

doi:10.1143/jpsj.71.630

Cited by 36 publications

(51 citation statements)

References 36 publications

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“…Therefore, one can expect that, given a dopant particle inside the cavity, the counteraction to rotation (or more precisely, to rotation jumps) of C 60 molecules will be stronger. As shown by Akimoto and Kan , no [22], as the temperature is raised the contribution from monomeric emission drops while the emission associated with traps increases. The latter depends critically on the transport of excitons of predominantly singlet nature.…”

Section: Effect Of Hydrogen Impurity Molecules On the Orientational Gmentioning

confidence: 88%

“…Following the method of Akimoto and Kan , no [22], all spectra were represented as a sum of two contributions of different origin. Making use of the analysis of saturation kinetics at different saturation temperatures [30], we dealt only with C 60 samples saturated with H 2 in the physisorption regime.…”

Section: Discussionmentioning

confidence: 99%

“…Photoluminescence spectra of pure C 60 have been first measured under two-photon excitation and then correctly interpreted [22]. Since in this study the one-photon method was employed, we had to make sure that our luminescence spectra and the attribution of the bands will be in good correspondence with the above-cited results of Akimoto and Kan , no.…”

Section: Spectral Luminescence Properties Of Pure and Hydrogen-intercmentioning

confidence: 92%

“…A-type luminescence (its edge at 1.69 eV) can be treated as originating from inhomogeneously broadened transitions within deep X-traps, which is most likely due to a perturbed Frenkel exciton of lowered symmetry, more or less delocalized over two neighbor molecules situated close enough to a strong lattice defect. Due to the selective excitation method employed [22] it has been established that the 1.69 eV peak is the "true beginning" of the 0*-0 transition whereas the other subpeaks are vibron-assisted transitions associated with Raman-active mode of even symmetry of separate C 60 molecules (eight , g h two g a , and their combinations) and accompanied by corresponding phonon wings. The above inhomogeneous broadening appears owing to orientational and translational intermolecular disorder.…”

Section: Spectral Luminescence Properties Of Pure and Hydrogen-intercmentioning

confidence: 99%

“…The photoluminescence spectrum of fullerite C 60 is determined by various emitting entities such as Frenkel excitons [22,23], charge-transfer excitons [24], and the so-called deep X-traps [22,23,25,26], most likely, associated with structure defects and impurities. Using luminescence data it has been demonstrated [20] that emission from X-traps and the variation of the integrated photoluminescence intensity can be a powerful instrument in studying effects of intercalation on the orientational ordering of fullerene molecules in the C 60 crystal lattice.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Orientational glassification in fullerite C60 saturated with H2: Photoluminescence studies

Zinoviev

Zoryansky

Silaeva

et al. 2012

Low Temperature Physics

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Using one-photon excitation we studied photoluminescence of C 60 saturated with molecular hydrogen over a temperature range 10 to 230 K. Saturation of samples was done at a pressure of 30 atm and at temperatures low enough (T < 250 °C) to exclude chemical sorption. The samples were saturated during periods of varied duration τ to reach different occupancy levels. To check reliability of our luminescence results and interpretation, our spectra for pure C 60 were compared with data known in the art, demonstrating good compatibility. The luminescence spectra were attributed according to the approach of Akimoto and Kan , no by separating total spectra in two components of different origin. The A-type spectra, which are associated with exciton transport to deep traps, above 70 K become prevail over the B-type emission. Until saturation times did not exceed a certain value (for one, 50 h for a saturation temperature of 200 °C) the integrated intensity I as a function of the temperature T of luminescence measurements, I(T), remained at a constant level up to the orientational vitrification point of about 100 K and then went rather steeply down with increasing T. However, at longer τ the intensity I(Τ) persisted in constancy to higher T (the higher, the longer τ) and then dropped with increasing T. This finding made us to reexamine more closely the lattice parameter vs saturation time dependence for saturation temperatures 200 and 230 °C. As a result, additional evidence allowed us to infer that after completion of the single-molecule filling of O-voids (specifically, after roughly 50 h for T sat = 200 °C) a slower process of double filling sets in. Double filling entails an anisotropic deformation of the octahedral cage, which modifies rotational dynamics stronger than single filling. Further, we argue that singlet exciton transport to traps (which is responsible for the A-type emission) can be crucially hampered by rotational jumps of one of the molecules over which a travelling exciton is spread. Such jumps break coherence and the exciton stops thereby increasing the probability of emissionless deactivation. If so, then the temperature, at which the rotational jumps occur sufficiently frequently, may be by inference considered the unfreezing point for the orientational glass state (essentially coinciding with the inverse critical point T g where the rotational system freezes into the orientational glass). This treatment of T g differs from that existing in the art according to which the glass state is destroyed owing to the increased density of phonon states. Keeping to our reasoning, we conclude that the orientational glass state does not disappear but, instead, is conserved almost unchanged under one-molecule feeling and persists to appreciably higher temperatures in the case of double filling, which affects exciton dynamics stronger.

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Section: Effect Of Hydrogen Impurity Molecules On the Orientational Gmentioning

confidence: 88%

Section: Discussionmentioning

confidence: 99%

Section: Spectral Luminescence Properties Of Pure and Hydrogen-intercmentioning

confidence: 92%

Section: Spectral Luminescence Properties Of Pure and Hydrogen-intercmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Orientational glassification in fullerite C60 saturated with H2: Photoluminescence studies

Zinoviev

Zoryansky

Silaeva

et al. 2012

Low Temperature Physics

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Dynamical Jahn‐Teller effect in the first excited

Huang

Liú

2019

Int J of Quantum Chemistry

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Jahn‐Teller effect of C60 monoanion in the first electronically excited states was theoretically investigated. The orbital vibronic coupling parameters for t1g next lowest unoccupied molecular orbitals were derived from the Kohn‐Sham orbital levels calculated using a frozen phonon approach with both hybrid B3LYP and CAM‐B3LYP functionals, which take long‐range interaction correction into consideration. With these coupling parameters, the vibronic states of first excited C60− were derived by exactly diagonalizing dynamical Jahn‐Teller Hamiltonian. The results showed that dynamical Jahn‐Teller effects are more significant in the first excited C60− than those in the ground electronic states. This work also clarified that CAM‐B3LYP gives results closer to experimental data than B3LYP.

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Photoluminescence and Structure of Fullerite C60 Intercalated with Helium

Avdeenko

Eremenko

Legchenkova

et al.

Spectroscopy of Emerging Materials

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Photoluminescence and Near-Edge Optical Absorption in the Low-Temperature Phase of Pristine C₆₀Single Crystals

Cited by 36 publications

References 36 publications

Orientational glassification in fullerite C60 saturated with H2: Photoluminescence studies

Orientational glassification in fullerite C60 saturated with H2: Photoluminescence studies

Dynamical Jahn‐Teller effect in the first excited

Photoluminescence and Structure of Fullerite C60 Intercalated with Helium

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Photoluminescence and Near-Edge Optical Absorption in the Low-Temperature Phase of Pristine C60Single Crystals

Cited by 36 publications

References 36 publications

Orientational glassification in fullerite C60 saturated with H2: Photoluminescence studies

Orientational glassification in fullerite C60 saturated with H2: Photoluminescence studies

Dynamical Jahn‐Teller effect in the first excited

Photoluminescence and Structure of Fullerite C60 Intercalated with Helium

Contact Info

Product

Resources

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Photoluminescence and Near-Edge Optical Absorption in the Low-Temperature Phase of Pristine C₆₀Single Crystals