Surface-specific visible light luminescence from composite metal oxide nanocrystals

Abstract

Low-coordinated surface elements on metal oxide nanoparticles represent the basis for a new concept of luminescent nanoparticles made of abundant, non-toxic, and thermally stable materials. This combined experimental and theoretical study describes the generation and stability of Ba-doped MgO nanoparticle surfaces and their optical absorption and luminescence dependence on Ba loading. It is demonstrated that the vapor phase growth process employed here represents a particularly robust synthesis approach for particle powders with reproducibly adjustable photoluminescence emission properties in the range between blue and yellow light. Moreover, this indepth characterization also provides an understanding of the electronic and optical characteristics of this nanoparticulate material with a so far unnoticed potential for solidstate light applications that are based on down conversion of UV light.

Thin water films and particle morphology evolution in nanocrystalline MgO

“…MgO nanoparticles were produced in a chemical vapor synthesis reactor at reduced pressure. Details of particle synthesis and subsequent thermal preprocessing are given in References . Prior to the different types and annealing procedures, the samples were exposed for twenty minutes to air to allow for adsorption of water molecules from the ambient.…”

Iron Precursor Decomposition in the Magnesium Combustion Flame: A New Approach for the Synthesis of Particulate Metal Oxide Nanocomposites

“…The preparation of pure MgO nanoparticles was based on the controlled combustion of metal vapor with oxygen under reduced pressure. Details are given elsewhere . This study developed a modified metal organic chemical vapor process, which provides good control over the concentration and distribution of iron in Fe–Mg–O nanocomposite samples.…”

“…The respective fields of application range from catalysis, [19][20][21][22][23][24] to photoactive sensing devices and solid-state white light emitters. [18,25,26] Moreover, CVS represents a promising route toward ensembles of surface functionalized nanocubes [22,27] which can be employed as model systems for surface chemistry, to study the formation and transformation of minerals as well as building blocks for the construction of hierarchical structures. [28] As will be shown below, thermal annealing of these metastable nanoparticles provides a playground for the stepwise materials disproportionation and controlled emergence of optical, electronic, or magnetic properties.…”

“…[28] As will be shown below, thermal annealing of these metastable nanoparticles provides a playground for the stepwise materials disproportionation and controlled emergence of optical, electronic, or magnetic properties. [18,29,30]…”

Structural Modifications and Extended Spectral Response of CeO2/CoPc Nanocomposites for Potential Applications

“…Inorganic metal nanoparticles provide the potential for high carrier mobilities, band‐gap tunability, a range of magnetic and dielectric properties, and thermal and mechanical stability. There is a great deal of interest in exploring alternative luminescent materials for solid‐state light applications, such as quantum dots (QDs) and inorganic–organic nanocomposites …”