Abstract
The phenomena which involve absorption of energy and subsequent emission of light are classified generically under the term luminescence. Phosphors are luminescent materials that emit light when excited by radiation, and are usually microcrystalline powders or thin-films designed to provide visible color emission. After decades of research and development, thousands of phosphors have been prepared and some of them are widely used in many areas. Excitation by absorbance of a photon leads to a major class of technically important luminescent species which fluoresce or phosphoresce. In general, fluorescence is “fast” (ns time scale) while phosphorescence is “slow” (longer time scale, up to hours or even days). For convenience, the topic of photoluminescence will be broadly divided into that based on relatively large-scale inorganic materials, mainly exhibiting phosphorescence, and that of smaller dye molecules and small-particle inorganic (“nanomaterials”), which can either fluoresce or phosphoresce. Their applications differ. For many of the derived technical applications, it is irrelevant whether the luminescence is fluorescence or phosphorescence. Either way the current range of applications is extensive, and in one case has been recognized by the award of a Nobel Prize, in 2008.
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Shinde, K.N., Dhoble, S.J., Swart, H.C., Park, K. (2012). Basic Mechanisms of Photoluminescence. In: Phosphate Phosphors for Solid-State Lighting. Springer Series in Materials Science, vol 174. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-34312-4_2
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