What is the easiest way to "decorate" nanocrystals embeded in a polymer matrix to enhance of the luminescence?
We have crystalline particles (in form of powder) doped with rare earth ions (luminesence ions). Because sample in form of powder it is not useful we embeded our particles inside polymer matrix. In the same time we try with microcrystalline and nanocrystalline particles. From the first measurements for thin polymeric films with our particles we see weak luminescence, thay is why we want to use silver nanoparticles to enhance of emission from particles (embeded in polymeric film)
1. One way is joint dilution of polymer, nanocrystals and metal particles in appropriate solvent with proper concentration. Afterthat you can perform spincoating of thin film doped by both types of particles.
2. Note however, that in order to realise solubility of metal particles and prevent teir aggregation, usually particles are covered by some shell (oxide etc.).
3. Finally you should be very careful with sizes of particles, shell and concentration in order to obtain required luminescence enchancement. There is famous paper of Lucas Novotny in PRL, where te influence of metall particle on the luminescence of dye has been investigated. At very small distances between lminescence center and metall nanoparticle you can obtain not the enchancement but qenching.
Dear Mr Naumov,
thank you for your explanations,
Do you remember the title of this paper?
Enhancement and quenching of single-molecule fluorescence.
By:Anger, Pascal; Bharadwaj, Palash; Novotny, Lukas
Physical review letters
Volume:96
Issue:11
Pages:113002
Published:2006-Mar-24 (Epub 2006 Mar 21)
Abstract
We present an experimental and theoretical study of the fluorescence rate of a single molecule as a function of its distance to a laser-irradiated gold nanoparticle. The local field enhancement leads to an increased excitation rate whereas nonradiative energy transfer to the particle leads to a decrease of the quantum yield (quenching). Because of these competing effects, previous experiments showed either fluorescence enhancement or fluorescence quenching. By varying the distance between molecule and particle we show the first experimental measurement demonstrating the continuous transition from fluorescence enhancement to fluorescence quenching. This transition cannot be explained by treating the particle as a polarizable sphere in the dipole approximation.
Author Information
Address:The Institute of Optics and Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA.
Document Information
Document Type:Journal Article
Language:English
PubMed ID:16605818
NLM Unique ID:0401141
Date Created: 11 Apr 2006 Date Completed: 31 May 2006
Published Electronically:21 Mar 2006
Country: United States
ISSN:0031-9007
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