Gold nanosphere enhanced green and red fluorescence in ZnO: Al, Eu3+

Bishnoi, Swati; Das, Ritwick; Chawla, Santa

doi:10.1063/1.4904014

Cited by 9 publications

(1 citation statement)

References 26 publications

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“…Also the optical properties of core‐shell nanoparticles consisting of ZnO shells grown on Ag and Au nanoparticle cores, by a solution method, have been investigated . Many other reports have highlighted the properties of the Au_ZnO system as tunable photodetector, catalyst and photocatalyst, field‐effect transistor, photoluminescent material, material for water splitting, for third order nonlinear optical properties, as diode for inverse I–V injection, for selective bio‐capture, for CO detection at room temperature, etc …”

Section: Introductionmentioning

confidence: 99%

One Pot Synthesis of Au_ZnO Core‐Shell Nanoparticles Using a Zn Complex Acting as ZnO Precursor, Capping and Reducing Agent During the Formation of Au NPs

et al. 2018

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Semiconducting ZnO nanostructures show a wide band gap, a large free exciton binding energy, high electron mobility and are excellent for ultraviolet detection. Noble metals absorb visible light and produce localized surface plasmon resonance useful to enhance visible photodetection. Therefore, the coupling of gold nanoparticles and the wide-band-gap ZnO semiconductor represents the moist suited way to enhance photodetection. The Au_ZnO system has already been obtained by multiple-step syntheses that involve the selective prepara- [a]

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Section: Introductionmentioning

confidence: 99%

One Pot Synthesis of Au_ZnO Core‐Shell Nanoparticles Using a Zn Complex Acting as ZnO Precursor, Capping and Reducing Agent During the Formation of Au NPs

et al. 2018

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Lanthanide-doped semiconductor nanocrystals: electronic structures and optical properties

2015

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solid state lightings [11,12]. Nevertheless, due to the parity forbidden transition nature, the absorption cross-section of f-f transition is small and usually high power light sources such as laser are needed to excite the Ln 3+ ions. The ability to excite Ln 3+ ions efficiently in a broad spectral range is strongly desired for realizing their full potentials in signaling and lighting applications. To improve the excitation efficiency of Ln 3+ , sensitization is an efficient way to avoid the direct excitation of the Ln 3+ . Charge transfer, electronics transfer from ligand ground states (e.g., O 1s) to the Ln 3+ excited states, has proved to be an efficient means to achieve intense Ln 3+ emissions, due to its large band absorption cross-section. By employing this strategy, commercial phosphor Y 2 O 3 :Eu 3+ has been demonstrated to be an excellent red phosphor, which can be effectively excited at Eu-O charge transfer band at 255 nm. Another strategy for efficient sensitization of Ln 3+ is via the energy transfer (ET) from semiconductor nanocrystals (SNCs), which generally possess large absorption cross-section for Ln 3+ excited states. Moreover, it is known that the exciton Bohr radius of semiconductors is much larger than that of insulators [13], which could result in pronounced quantum confinement effect for small nanocrystals (NCs) (e.g., 2−10 nm for In 2 O 3 , ZnO and TiO 2 ). As a result, the optical properties of Ln 3+ incorporated in SNCs could be tailored via size control or bandgap engineering, which is very attractive in fabricating a nano-device for technological applications. It is anticipated that the luminescence of Ln 3+ ions can be efficiently sensitized via the energy transfer from the excited host to Ln 3+ , which thereby overcomes the inefficient direct absorptions of the parity forbidden 4f-4f transitions of Ln 3+ ions (Fig. 1). To realize the efficient energy transfer and intense Ln 3+ PL, the successful incorporation of Ln 3+ into the lattices of SNCs is of utmost importance, which still remains a great challenge via conventional wet-chemical methods especially for some widely used wide bandgap Trivalent lanthanide (Ln 3+ ) ions doped semiconductor nanomaterials have recently attracted considerable attention owing to their distinct optical properties and their important applications in diverse fields such as optoelectronic devices, flat plane displays and luminescent biolabels. This review provides a comprehensive survey of the latest advances in the synthesis, electronic structures and optical spectra of Ln 3+ ions in wide band-gap semiconductor nanocrystals (SNCs). In particular, we highlight the general wet-chemical strategies to introduce Ln 3+ ions into host lattices, the local environments as well as the sensitization mechanism of Ln 3+ in SNCs. The energy levels and crystal-field parameters of Ln 3+ in various SNCs determined from energy-level-fitting are summarized, which is of vital importance to understanding the optical properties of Ln 3+ ions in SNCs. Finally, some future pros...

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Laser writing of CsPbBr3 nanocrystals mediated by closely-packed Au nanoislands

Zhuang

Deng

et al. 2021

Applied Surface Science

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Gold nanosphere enhanced green and red fluorescence in ZnO: Al, Eu3+

Cited by 9 publications

References 26 publications

One Pot Synthesis of Au_ZnO Core‐Shell Nanoparticles Using a Zn Complex Acting as ZnO Precursor, Capping and Reducing Agent During the Formation of Au NPs

One Pot Synthesis of Au_ZnO Core‐Shell Nanoparticles Using a Zn Complex Acting as ZnO Precursor, Capping and Reducing Agent During the Formation of Au NPs

Lanthanide-doped semiconductor nanocrystals: electronic structures and optical properties

Laser writing of CsPbBr3 nanocrystals mediated by closely-packed Au nanoislands

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