Luminescence quantum yields of gold nanoparticles varying with excitation wavelengths

Cheng, Yuqing; Lü, Guowei; He, Yu; Shen, Hongming; Zhao, Jingyi; Xia, Keyu; Gong, Qihuang

doi:10.1039/c5nr07343j

Cited by 40 publications

(46 citation statements)

References 25 publications

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“…Therefore, excitation just above the plasmon resonance should excite the electron–hole pairs with nearly the same efficiency as well above the plasmon resonance. 23 , 36 …”

Section: Phenomenological Model For the Luminescence Emissionmentioning

confidence: 99%

Gold Nanoparticles as Absolute Nanothermometers

2018

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Nanothermometry is a challenging field that can open the door to intriguing questions ranging from biology and medicine to material sciences. Gold nanorods are excellent candidates to act as nanoprobes because they are reasonably bright emitters upon excitation with a monochromatic source. Gold nanoparticles are commonly used in photothermal therapy as efficient transducers of electromagnetic radiation into heat. In this work we use the spectrum of the anti-Stokes emission from gold nanorods irradiated in resonance to measure the absolute temperature of the nanoparticles and their surrounding medium without the need for a previous calibration. We show a 4 K accuracy in the determination of the temperature of the medium with spectral measurements of 180 s integration time. This procedure can be easily implemented in any microscope capable of acquiring emission spectra, and it is not limited to any specific shape of nanoparticles.

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“…Therefore, excitation just above the plasmon resonance should excite the electron–hole pairs with nearly the same efficiency as well above the plasmon resonance. 23 , 36 …”

Section: Phenomenological Model For the Luminescence Emissionmentioning

confidence: 99%

Gold Nanoparticles as Absolute Nanothermometers

2018

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“…12 Hence, the intensity of so-called PL emission of the plasmonic nanostructures at the excitation frequency is finite, and the PL quantum efficiency is several orders of magnitude lower than that of Rayleigh scattering. 17 Considering the energy band theory, light emission also depends on the electron distribution near the Fermi energy level, as shown in Fig.2c. Anti-Stokes emission, i.e., at the high-energy side of the laser, owing to thermal smearing of the electron and hole distributions, can be described well by the Fermi-Dirac distribution function.…”

Section: Introductionmentioning

confidence: 99%

Spectral shape of one-photon luminescence from single gold nanorods

Wen

Liu

et al. 2017

AIP Advances

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Light emission from gold nanoparticles was investigated with ultra-narrow-band notch filters to obtain the complete spectral shape. The anti-Stokes emission band was observed at all excitation wavelengths. The spectral shape of the anti-Stokes emission could be well fitted by a Fermi–Dirac-like line shape, while the spectral profile of the Stokes emission could be fitted by a Lorentzian line shape. The electron distribution and local surface plasmon resonance jointly determined the spectral shape. Additionally, we found that the anti-Stokes emission intensity increased more rapidly compared with that of the Stokes emission as illumination power was increased. This phenomenon can be understood from the temperature dependence of the electron distribution owing to photothermal effects.

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“…Finally, although the typically modest luminescence quantum yield of GNP needs to be improved to make them competitive with other systems for in vivo applications,, we believe that the results we reported here pave the road to the development of new NIR‐emitting stimuli‐responsive nanomaterials for combined diagnostics and therapeutics.…”

Section: Methodsmentioning

confidence: 92%

Photoswitchable NIR‐Emitting Gold Nanoparticles

et al. 2016

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Photo-switching of the NIR emission of gold nanoparticles (GNP) upon photo-isomerization of azobenzenel igands,b ound to the surface,i sd emonstrated. Photophysical results confirm the occurrence of an excitation energy transfer process from the ligands to the GNP that produces sensitized NIR emission. Because of this process,the excitation efficiency of the gold core,u pon excitation of the ligands,i s muchh igher for the trans form than for the cis one,a nd t!c photo-isomerization causes ar elevant decrease of the GNP NIR emission. As ac onsequence,p hoto-isomerization can be monitored by ratiometric detection of the NIR emission upon dual excitation. The photo-isomerization process was followed in real-time through the simultaneous detection of absorbance and luminescence changes using ad edicated setup.S urprisingly,the photo-isomerization rate of the ligands,bound to the GNP surface,was the same as measured for the chromophores in solution. This outcome demonstrated that excitation energy transfer to gold assists photo-isomerization, rather than competing with it. These results pave the road to the development of new,NIR-emitting,stimuli-responsive nanomaterials for theranostics.Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under http://dx.

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Luminescence quantum yields of gold nanoparticles varying with excitation wavelengths

Cited by 40 publications

References 25 publications

Gold Nanoparticles as Absolute Nanothermometers

Gold Nanoparticles as Absolute Nanothermometers

Spectral shape of one-photon luminescence from single gold nanorods

Photoswitchable NIR‐Emitting Gold Nanoparticles

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