Electron transition pathways of photoluminescence from 3C-SiC nanocrystals unraveled by steady-state, blinking and time-resolved photoluminescence measurements

Gan, Zhixing; Wu, Xiaohong; Xu, Hao; Zhang, Ning; Nie, Shouping; Fu, Ying

doi:10.1088/0022-3727/49/27/275107

Cited by 11 publications

(14 citation statements)

References 25 publications

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“…The FWHM of the 1/β distribution peak is about 140 meV, which is very close to the FWHM of the steady-state PL spectrum (~144 meV). On the contrary, as reported previously, for PL of SiC NCs caused by size effect, both τ and β are hardly dependent on the detection wavelength [33]. In that case, the ultra-broad PL widths with FWHM>600 meV are originated from the size distribution of the NCs.…”

Section: Resultscontrasting

confidence: 44%

“…When excitation wavelength increases, more NCs with big sizes and narrow bandgaps are selectively excited, resulting in PL spectral redshift, which has been extensively observed in Si quantum dots, SiC NCs, carbon nanoparticles, graphene quantum dots, and MoS2 quantum dots. [31][32][33] Here, the PL peaks of perovskite NCs that hardly shift tend to imply minor contribution from size effect. PL excitation (PLE) spectra monitored at emission wavelengths of 455, 465, and 475 nm are also acquired.…”

Section: Resultsmentioning

confidence: 94%

“…On the contrary, as reported previously, for PL of SiC NCs caused by size effect, both τ and β are hardly dependent on the detection wavelength. [33] In that case, the ultra-broad PL widths with FWHM>600 meV are originated from the size distribution of the NCs. The fittings of the two different stages are presented in Figure 5a,b, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Photoluminescent Spectral Broadening of Lead Halide Perovskite Nanocrystals Investigated by Emission Wavelength Dependent Lifetime

Zhang

Yang

et al. 2020

Molecules

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Despite intensive efforts, the fluorescence of perovskite nanocrystals (NCs) still suffers from a poor color purity, which limits the applications in light emitting and multicolor display. A deep understanding on the fundamental of the photoluminescent (PL) spectral broadening is thus of great significance. Herein, the PL decay curves of the CsPbClxBr3-x NCs are monitored at different wavelengths covering the entire PL band. Moreover, energy relaxation time τ and radiative recombination time β are obtained by numerical fittings. The dependences of τ and 1/β on the detection wavelength agree well with the steady-state PL spectrum, indicating the observed PL broadening is an intrinsic effect due to the resonance and off-resonance exciton radiative recombination processes. This work not only provides a new analysis method for time-resolved PL spectra of perovskites, but also gains a deep insight into the spectral broadening of the lead halide perovskite NCs.

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Section: Resultscontrasting

confidence: 44%

Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

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Photoluminescent Spectral Broadening of Lead Halide Perovskite Nanocrystals Investigated by Emission Wavelength Dependent Lifetime

Zhang

Yang

et al. 2020

Molecules

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“…A numerical analysis is performed based on a reported model. 28,29 Specically, uorescence process could be described by relaxation time s and recombination time b. And these two values could be extracted by tting the time-resolved uorescence curves.…”

Section: Resultsmentioning

confidence: 99%

“…ffiffiffiffiffiffiffiffi ffi FðtÞ p is linearly related with t. During this time interval ħu n is almost unoccupied, while the variations of ħu 1 and ħu 0 occupations are similar. 28,29 Thence in this time window, radiative recombination time b (relax from ħu 1 to ħu 0 ) can be acquired.…”

Section: Resultsmentioning

confidence: 99%

Electron transition pathways of graphene oxide quantum dots unraveled by emission wavelength dependent photoluminescence lifetime

Guo

Shui-e

2017

RSC Adv.

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Fluorescent Silicon Carbide Nanoparticles

Vries

Sato

Ohshima

et al. 2021

Advanced Optical Materials

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Silicon carbide (SiC) is an indirect wide band gap semiconductor that is utilized in many industrial applications due to its extreme physical properties. SiC nanoparticles (NPs) exhibit a versatile surface chemistry, fluoresce from the ultraviolet to the near‐infrared spectral ranges, and their sizes can be tuned from one to hundreds of nanometers. Yet, fluorescent SiC NPs have received far less attention by the scientific community. This review summarizes the state‐of‐the‐art in fluorescent SiC NPs. Nanoparticle fabrication methods, characterization techniques, nanoparticle surface chemistry, and SiC NPs fluorescence properties are assessed in detail. Atomic defects and impurities in the SiC crystal lattice (so‐called color centers), surface‐induced fluorescence, quantum confinement, and band‐edge fluorescence are identified as the main sources of fluorescence in SiC NPs. While many color centers are reported in bulk SiC, only few are identified in SiC NPs and interface‐related defects remain poorly understood, creating enormous potential for scientific discovery. Finally, an overview of demonstrated and emerging potential applications of SiC NPs in the areas of bioimaging and quantum sensing is provided.

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Electron transition pathways of photoluminescence from 3C-SiC nanocrystals unraveled by steady-state, blinking and time-resolved photoluminescence measurements

Cited by 11 publications

References 25 publications

Photoluminescent Spectral Broadening of Lead Halide Perovskite Nanocrystals Investigated by Emission Wavelength Dependent Lifetime

Photoluminescent Spectral Broadening of Lead Halide Perovskite Nanocrystals Investigated by Emission Wavelength Dependent Lifetime

Electron transition pathways of graphene oxide quantum dots unraveled by emission wavelength dependent photoluminescence lifetime

Fluorescent Silicon Carbide Nanoparticles

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