A novel strategy for improving upconversion luminescence of NaYF4:Yb, Er nanocrystals by coupling with hybrids of silver plasmon nanostructures and poly(methyl methacrylate) photonic crystals

Large Upconversion Enhancement in the “Islands” Au–Ag Alloy/NaYF4: Yb3+, Tm3+/Er3+ Composite Films, and Fingerprint Identification

“…The adoption of organic template and removal by heat treatment can ensure the formation of island structure for the Au-Ag alloy fi lm and the separation of alloy particles, which is signifi cant for shortening the interaction distance between Au-Ag alloy fi lm and the NaYF 4 : Yb 3+ , Tm 3+ UCNPs, and enhancing the coupling of SPR with the UCNPs. [ 34 ] In order to further increase the coupling with SPR, the average size of NaYF 4 : Yb 3+ , Tm 3+ UCNPs dispersed onto Au-Ag alloy fi lm was controlled ranging of 7-50 nm (see Figure S1, Supporting Information). NPs.…”

“…NPs. [ 34,42 ] This phenomenon allows the SP of Au-Ag fi lms coupling with either the 980 nm excitation light or the emission lines of NaYF 4 : Yb 3+ , Tm…”

“…[33][34][35] As well known, plasmonic nanostructures can concentrate the incoming light into strong localized electric fi elds ( E ) distributed within the subwavelength regions close to the surface of the nanostructures (≈2-10 nm), leading to the near-fi eld enhancement approaching to two orders of magnitude. [ 31,36,37 ] Theoretically, the emission intensity of traditional photoluminescent materials such as quantum dots, dyes, and lanthanide-based phosphors satisfi es the linear relationship with the square of the electric fi eld intensity ( |E| 2 ), while the UCL intensity is proportional to the 2 n -th power of the electric fi eld intensity ( |E| 2 n for a n-photon UC process).…”

Nanostructure for Hybrid Plasmonic–Photonic Crystal Formed on Gel-Immobilized Colloidal Crystal Observed by AFM after Drying

“…On the other hand, Ag nanoparticles/nanostructure were employed in some studies 1, 2, 5, 3 because of their high performance of the electric field enhancement. For the photonic crystal material, polystyrene (a regular array of particles or a regular pattern) was selected in some studies, 2,4,3,6 while poly(methyl methacrylate) was used by Xu et al 5 and silica was used by Kim et al 1 An advantage of polystyrene is narrow particle size dispersity. Polystyrene suspensions with the dispersity less than few percent in the coefficient of variation can be synthesized by a soap-free emulsion polymerization.…”

Silver nanoparticles embedded hybrid organometallic complexes: Structural interactions, photo-induced energy transfer, plasmonic effect and optical thermometry

“…The recent trends in the field of lanthanide complexes are to introduce metal nanoparticles to tune its luminescent behavior and boost their efficiency for optical device applications. [11][12][13][14] Recently, Parola et al have given a detailed overview on different types of lanthanide based hybrid nanomaterials and demonstrated that, controlled coupling between plasmonics (attaching metal nanoparticles) and luminescence opens a wide field of intense research. 15 The luminescence mechanism of the lanthanide complexes are based on the ligand absorption coefficient and energy transfer to central metal ion (lanthanides).…”