Synthesis and Luminescence Properties of Ag₂S and PbS Clusters in Zeolite A

Abstract

Zeolite A provides a suitable environment to host Ag2S and PbS clusters, so that spectroscopic investigations on very small particles are possible. The Ag2S monomer is colorless and shows photoluminescence at 490 nm with a lifetime of 300 micros, while the absorption and luminescence of Ag4S2 and larger clusters are red-shifted. The properties of these Ag2S/zeolite A materials depend on the co-cations. Results for Li+, Na+, K+, Rb+, Cs+, Mg2+, Ca2+, and Sr2+ are reported. Excitation energy transfer between Ag2S and Ag4S2 has been studied in materials containing Ca2+ co-cations. PbS particles can be prepared by the same method as Ag2S in the cavities of zeolite A. The PbS monomers obtained are yellow and show photoluminescence at 570 nm, with a lifetime of 700 ns.

ZnS micro-spheres and flowers: Chemically controlled synthesis and template use in fabricating MS(shell)/ZnS(core) and MS (M = Pb, Cu) hollow microspheres

“…Transition metal sulfides like ZnS, PbS and CuS with excellent electrical and optical properties have a wide range of applications such as in the fields of flat-panel display, luminescent devices, infrared windows, light emitting diodes (LED), solar cells, ion-selective sensors, mode-locking in lasers, secondary batteries, and catalysis [1][2][3][4]. However, to bring their new types of applications and enhance the performance of currently existing photoelectric devices, research on modulating their existing optical properties is necessary.…”

Mechanistic Studies on the Nucleation of Zinc Sulphide Nanoparticles by Means of XAFS Spectroscopy

“…The control of their size and distribution has been attained by using both colloidal and solid state media, e.g. reverse micelles [4], surfactant vesicles [5], zeolites [6][7][8], mixed surfactant systems [9], polymer composites [10] and ionomers [11]. Metal sulphide nanoparticles of predictable size have been conveniently prepared by controlled nucleation of clusters stabilised through surface passivation in solution or in solid-phase matrix.…”

XAFS Study on Ag2S Semiconductor Clusters Designed in Nanopores and Their Photoluminescence Properties

“…However, the quantum-sized clusters or particles are not stable. Using the welldefined micro cavities of zeolite, Ag 2 S could be highly dispersed in zeolite and show unique photoluminescence properties [5][6][7][8]. The structures of the hosts may have different effects on the photoluminescence properties of semiconductor clusters.…”