Underlying mechanism of blue emission enhancement in Au decorated p-GaN film

Qin, Feifei; Chang, Ning; Xu, Chunxiang; Zhu, Qiuxiang; Wei, Ming; Zhu, Zhu; Chen, Feng; Lu, Junfeng

doi:10.1039/c7ra01193h

Cited by 11 publications

(14 citation statements)

References 30 publications

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“…We then determined the fluorescence enhancement factor, E = I Au‐C / I C , where I Au‐C is the fluorescence intensity of Au‐CNSs and I C is the reference fluorescence intensity of pure CNSs. Figure b shows an enhancement factor of 1.77 for the Au‐CNSs, which is comparable to the recently reported UV enhancements of other Au‐enhanced composites (Table S1, Supporting Information) . Furthermore, the emission wavelength remained unchanged.…”

Section: Resultssupporting

confidence: 86%

“…As proposed in earlier reports, charge transfer may strongly contribute to the UV emission enhancement. The green emission observed in Figure c confirms the existence of bandtail/mid‐gap states in the CNSs, though these states are relatively weak compared with those of the CNDs.…”

Section: Resultssupporting

confidence: 65%

“…However, the surface plasmon resonance frequency of Au nanoparticles (NPs) was reported to be located in the green region . Thus, explaining the observed PL enhancement in the UV region currently remains a challenge . Herein, Au‐CNSs were fabricated, and enhanced UV emission was observed for these Au‐CNSs.…”

Section: Resultsmentioning

confidence: 98%

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Ultraviolet Photoluminescence of Carbon Nanospheres and its Surface Plasmon‐Induced Enhancement

Gan

Pan

Chen

et al. 2018

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Ultraviolet (UV) light can be used in versatile applications ranging from photoelectronic devices to biomedical imaging. In the development of new UV light sources, in this study, stable UV emission at ≈350 nm is unprecedentedly obtained from carbon nanospheres (CNSs). The origin of the UV fluorescence is comprehensively investigated via various characterization methods, including Raman and Fourier transform infrared analyses, with comparison to the visible emission of carbon nanodots. Based on the density functional calculations, the UV fluorescence is assigned to the carbon nanostructures bonded to bridging O atoms and dangling -OH groups. Moreover, a twofold enhancement in the UV emission is acquired for Au-carbon core-shell nanospheres (Au-CNSs). This remarkable modification of the UV emission is primarily ascribed to charge transfer between the CNSs and the Au surface.

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Section: Resultssupporting

confidence: 86%

Section: Resultssupporting

confidence: 65%

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Ultraviolet Photoluminescence of Carbon Nanospheres and its Surface Plasmon‐Induced Enhancement

Gan

Pan

Chen

et al. 2018

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“…This observation is quite unexpected in the charge transfer context as the Fermi level of Au NPs remains in the band gap region of all the three differently sized QDs (Scheme ). , …”

Section: Resultsmentioning

confidence: 99%

“…This observation is quite unexpected in the charge transfer context as the Fermi level of Au NPs remains in the band gap region of all the three differently sized QDs (Scheme 2). 75,76 To establish whether or not charge transfer is responsible behind the observed PL quenching of green QDs by Au NPs, we have synthesized citrate capped Ag NPs having LSPR far away from the excitonic emission of all the three differently sized QDs. Earlier, it has been established that MPA-capped CdTe QDs undergo charge transfer dynamics in the presence of citrate-capped Ag NPs.…”

Section: Resultsmentioning

confidence: 99%

Long-Range Resonance Coupling-Induced Surface Energy Transfer from CdTe Quantum Dot to Plasmonic Nanoparticle

Vaishnav

Mukherjee

2018

J. Phys. Chem. C

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Fundamental understanding and precise control of complex nonradiative processes in nanoscale system finds significant interest in recent times due to their importance in various nanophotonics applications. Here we have systematically investigated the mechanism behind photoluminescence (PL) quenching of mercaptosuccinic acid (MSA) capped CdTe QDs in the near field of gold and silver nanoparticles (Au and Ag NPs) by using steady-state and time-resolved photoluminescence (PL) spectroscopy. Resonance coupling between excitonic emission and localized surface plasmon resonance (LSPR) of Au NPs has been tuned by varying the size of QDs. Herein, three differently sized MSA-capped CdTe QDs have been synthesized namely, 2.1 ± 0.7, 3.1 ± 0.4, and 3.9 ± 0.3 nm with emission in green, yellow and red region of the electromagnetic spectrum, respectively. It has been observed that both the luminescence intensity and lifetime of green QDs quench significantly in the near field of 20 nm sized Au NPs. In contrast, the luminescent intensity and lifetime of yellow and red QDs remain unaltered in the presence of Au NPs. Moreover, it has been observed that ligand exchange at the surface of Au NPs with Poly(ethylene glycol) methyl ether thiol (PEG-SH) decreases the quenching efficiency of the green QD-Au NP pair significantly. In addition, the extent of quenching strongly depends on excitation wavelength. The observed quenching is more efficient at the excitation wavelength close to the LSPR of Au NP. These results have been explained on the basis of a size-dependent nanometal surface energy transfer (NSET) model by incorporating the changes in the complex dielectric function and the absorptivity of the Au NP. On the contrary, irrespective of the sizes of QDs, significant PL quenching has been observed in the presence of 10 nm sized citrate-capped Ag NPs as a consequence of photoinduced electron transfer (PET). The present findings of size and wavelength-dependent long-range nonradiative electromagnetic coupling in hybrid QD-metal NP system can be useful to understand and optimize the performance of various nanophotonic devices.

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Recent Progress in Low Threshold Plasmonic Nanolasers

Wang

et al. 2023

Advanced Optical Materials

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Plasmonic nanolasers as a new class of coherent laser beyond the diffraction limit have attracted a lot of attention. However, the ultrahigh optical confinement caused by the plasmon effect is inevitably accompanied by metal absorption loss, thus increasing the pump threshold of the plasmonic nanolaser. In the past decade, many good results about low threshold plasmonic nanolasers have been realized and successfully extended to various applications. Here, this advance is discussed and some opinions are offered. First, based on the theoretical model and key parameters of the plasmonic nanolaser, the factors affecting the threshold are analyzed. Subsequently, the experimental efforts on the realization of low threshold plasmonic nanolasers from optical pumping to electrical pumping are reviewed. Their applications in on‐chip optical interconnects, biochemical analysis, and far‐field structure are then considered. Finally, feasible approaches to threshold reduction are discussed, as well as more possible applications in the future.

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Underlying mechanism of blue emission enhancement in Au decorated p-GaN film

Cited by 11 publications

References 30 publications

Ultraviolet Photoluminescence of Carbon Nanospheres and its Surface Plasmon‐Induced Enhancement

Ultraviolet Photoluminescence of Carbon Nanospheres and its Surface Plasmon‐Induced Enhancement

Long-Range Resonance Coupling-Induced Surface Energy Transfer from CdTe Quantum Dot to Plasmonic Nanoparticle

Recent Progress in Low Threshold Plasmonic Nanolasers

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