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- W1995092714 abstract "This article presents a broad review of long persistence (LP) materials that are a special kind of photon energy storage and conversion materials. They are also known as long afterglow phosphors or long decay phosphors (LDP). These phosphors can be readily excited by any ordinary household lamp, sunlight and/or ambient room lights and glow continuously in the dark for hours together without involving any radioactive elements. It is the modifications that are made to crystalline host lattice that exhibit these unusual properties related to persistence due to effective doping of some transition or rare-earth ions. A slight variation in the processing parameters such as type of reducing atmosphere, stoichiometric excess of one or more constituents, the nature of fluxes, and the intentional addition of carbon or rare-earth halides can drastically shift the emission colors and persistence times of the LP phosphors in the visible spectrum. Historically, Cu-doped ZnS phosphor had been a traditional LP material with its afterglow time less than an hour. The emission color of these LP phosphors was confined between green and yellow-green region only. However, synthesis of blue and red-emitting phosphors with long persistence times had been always a challenging task. This review article covers the recent advances in the blue, green and red-emitting LP phosphors/nanophosphors, persistence mechanism involved and the basic problems associated with their luminescence efficiency and persistence times. Modifications to existing nanosynthesis protocols to formulate a nontoxic Green Chemistry Route are also presented.Contents of Paper1. Long Afterglow Phosphors" @default.
- W1995092714 created "2016-06-24" @default.
- W1995092714 creator A5027070013 @default.
- W1995092714 creator A5063968603 @default.
- W1995092714 creator A5067730235 @default.
- W1995092714 date "2015-01-01" @default.
- W1995092714 modified "2023-09-27" @default.
- W1995092714 title "Persistence Mechanisms and Applications of Long Afterglow Phosphors" @default.
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- W1995092714 doi "https://doi.org/10.4028/www.scientific.net/ddf.361.69" @default.
- W1995092714 hasPublicationYear "2015" @default.
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