Blue luminescence of Au nanoclusters embedded in silica matrix

Abstract

Photoluminescence study using t he 325 nm He-Cd excitation is reported for the Au nanoclusters embedded in SiO 2 matrix.

Absorption spectra of small silver clusters Agn (n=4, 6, 8): A TDDFT study

“…The oscillator strengths decrease with decreasing bond length. In fact, a blueshift ($0.1 eV) of photoluminescence peak at 3.4 eV with decreasing cluster size has been indeed reported experimentally due to the compressive strain in nanometer clusters when Au nanoclusters are embedded in silica substrates [35]. The calculated optical response of the Ag 4 clusters is quite similar to that of the large nanoparticle.…”

Photoluminescence from Au nanoparticles embedded in Au:oxide composite films

“…The PL peaks of noble metals (e.g., Au) were also found to locate in a wide range varying from the visible to the near-infrared region. 2,3,[10][11][12][13][14] Usually the visible photoluminescence was due to the interband transition between the s,p conduction bands and the d bands, while the infrared one was owing to the intraband transition inside the sp conduction band. Relative theoretical studies have also made some progress in dealing with the origins of this PL phenomenon.…”

Enhancement and quenching of photoluminescence from silicon quantum dots by silver nanoparticles in a totally integrated configuration

“…[23][24][25] According to Eq. (2), the mean size of the Ag NPs was 3.11 nm, 3.42 nm and 3.38 nm for the samples implanted at 1 MeV, 2 MeV and 3 MeV, respectively.…”