Controlled photoluminescence from self-assembled semiconductor–metal quantum dot hybrid array films

Abstract

Thin films of hybrid arrays of cadmium selenide quantum dots and polymer grafted gold nanoparticles have been prepared using a BCP template. Controlling the dispersion and location of the respective nanoparticles allows us to tune the exciton-plasmon interaction in such hybrid arrays and hence control their optical properties. The observed photoluminescence of the hybrid array films is interpreted in terms of the dispersion and location of the gold nanoparticles and quantum dots in the block copolymer matrix.

Photoluminescence decay rate engineering of CdSe quantum dots in ensemble arrays embedded with gold nano-antennae

“…15,16,38 Hybrid arrays of quantum dots and Au nanoparticles were prepared using a polymer template consisting of polystyrene (PS) and polyvinyl pyridine (P4VP) as reported elsewhere. 15,16,38 The dispersion of Au nanoparticles and quantum dots inside the polymer photonic template is schematically shown in Fig. 1.…”

“…5 The electrical and optical properties of arrays of quantum dots [6][7][8][9] as well as binary assemblies of quantum dots with metal nanoparticles are beginning to be explored. [10][11][12][13][14][15][16][17][18] Although various applications of such arrays have been envisaged, 9,[19][20][21] the ability to understand and control the optical properties of such arrays depends significantly on understanding of the interactions between the excitons in multiple quantum dots and the plasmons in multiple metal nanoparticles. Most theoretical and experimental works, thus far, have dealt with relatively simple systems involving few or single quantum dot and metal nanoparticles.…”

“…But such use of the size and distribution in turn needs precise control over local densities of both the antennae and the quantum dots. It has been shown earlier by us and others 15,16,37 that arrays of chemically synthesized Cadmium Selenide (CdSe) quantum dot assemblies doped with gold (Au) nanoparticles can be prepared, based on simple self-assembly methods, using a polymer template, with independent control over their respective location, density and size as well as lattice parameters of the arrays. Here, we report new results on photoluminescence (PL) spectroscopy and lifetime measurements on such 2-dimensional (2D) hybrid arrays as a function of increasing number of Au nanoantennae for fixed density of quantum dots.…”

Plasmonic Tuning of Photoluminescence from Semiconducting Quantum Dot Assemblies

“…A key aspect in understanding the nature of interaction involves exploring the coupling between excitons in quantum dots [4] and plasmons in metal nanoparticles [5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Two regimes are usually identified-weak and strong coupling.…”

Controlling the decay dynamics of quantum dot by plasmonic templates

“…TOPO capped CdSe Quantum dots are synthesized [1] and it shows emission peak at 580 nm. To prepare plasmonic templates, we use block copolymer spin coated films details given in [2,3].…”