Electron–phonon scattering and excitonic effects in T-carbon

Bu, Xiangtian; Wang, Shudong

doi:10.1039/d0ra02343d

Cited by 5 publications

(4 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, there is an inverse relationship between the size of the CQDs and the magnitude of the Stokes shift, with values ranging from 0.504 to 0.491 to 0.451 eV for samples S1, S2, and S3, respectively. The pronounced Stokes shift observed in the CQDs is intricately linked to the Huang‐Rhys factor (S) and longitudinal optical (LO) phonon modes with an energy of ħv LO =121.68 meV [44] . The calculation of the S values (approximately 2.06, 2.01, and 1.85 for samples S1, S2, and S3, respectively) underscores the profound influence of carrier‐phonon coupling and the Huang‐Rhys factor on the emergence of ESTs within CQDs.…”

Section: Resultsmentioning

confidence: 99%

“…The pronounced Stokes shift observed in the CQDs is intricately linked to the Huang-Rhys factor (S) and longitudinal optical (LO) phonon modes with an energy of � hv LO = 121.68 meV. [44] The calculation of the S values (approximately 2.06, 2.01, and 1.85 for samples S1, S2, and S3, respectively) underscores the profound influence of carrierphonon coupling and the Huang-Rhys factor on the emergence of ESTs within CQDs. Additionally, the dependence of the optical properties, particularly the Stokes shift, on the CQD size offers essential insights into their size-dependent behavior.…”

Section: Optical Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

Size‐Dependent Optical Properties and Exciton Self‐Trapping Emission in Carbon Quantum Dots

Van Duong,

Anh Thi,

Duc Toan

et al. 2024

ChemistrySelect

View full text Add to dashboard Cite

Carbon quantum dots (CQDs), synthesized through controlled microplasma treatment of orange juice, exhibit unique luminescent characteristics. The impact of synthesis time on particle size was investigated. Deconvoluted emission spectra displayed broad bands, peaking at an excitation wavelength of 350 nm for CQD sizes of 2.06, 2.4, and 3.09 nm, indicating multiple fluorescence peaks. This suggests a mixture of CQDs with different excitation energies on their surfaces. Luminescence kinetics unveiled three exponential decay components with time constants of 2.73, 4.61, and 3.27 ns, indicating multiple luminescent centers. Emission behavior affected by excitation wavelengths ranging from 350 to 490 nm suggests that quantum transition probabilities are influenced by impurities or defects. These findings emphasize the size‐dependent optical properties and exciton self‐trapping (EST) emission of CQDs. The calculation of the Huang‐Rhys factor S values underscores the profound influence of carrier‐phonon coupling and the Huang‐Rhys factor on the emergence of ESTs within CQDs. Understanding these interactions is crucial for fully utilizing the capabilities of CQDs in applications spanning optoelectronics, sensors, bioimaging, and various technological fields.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Optical Propertiesmentioning

confidence: 99%

Size‐Dependent Optical Properties and Exciton Self‐Trapping Emission in Carbon Quantum Dots

Van Duong,

Anh Thi,

Duc Toan

et al. 2024

ChemistrySelect

View full text Add to dashboard Cite

show abstract

“…The scattering rate and relaxation time (RT) of different phonon modes, including lateral acoustics (TA), longitudinal acoustics (LA), lateral optics (TO), and longitudinal optics (LO) phonon modes, are shown in Fig. 14(a) [224]. In general, the contribution to scattering from optical phonons (mainly TO mode) is much larger than that from acoustic phonons in a wide energy range.…”

Section: Excitonic Effectmentioning

confidence: 99%

“…Mode-resolved scattering rates and total relaxation time of (a) holes and (b) electrons, where the relative contribution from the TO branch is inserted. Reprinted (adapted) with permission from ref[224].…”

mentioning

confidence: 99%