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Hydrothermal synthesis, morphology and photoluminescent properties of an Mn4+-doped novel red fluoride phosphor elpasolite K2LiAlF6

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      Abstract

      A novel red emitting fluoride phosphor, K2LiAlF6:Mn4+, with an excellent thermal quenching behavior and color stability for white LEDs is developed by a green synthetic route based on low-toxic H3PO4/KHF2 liquid instead of the highly toxic HF liquid.

      Abstract

      Presently, new red emitting Mn4+ activated fluoride phosphors that are obtained via green synthetic routes remain a great challenge in the field of luminescent materials for advanced applications in solid state lighting and displays. In this study, for the first time, we develop a novel red emitting fluoride phosphor, K2LiAlF6:Mn4+, and it is synthesized in low-toxic H3PO4/KHF2 liquid instead of the highly toxic HF liquid, which is a necessity in the synthesis of fluoride phosphors. Moreover, the morphology and photoluminescence properties of K2LiAlF6:Mn4+ were systematically investigated. The results show that the Mn4+ ion exhibits a broadband excitation extending from 300 to 500 nm, which matches well with UV and blue LED chips and obtains an ideal red emission at 635 nm, due to the similarities in cation site symmetry and host iconicity between the famous K2TiF6 and target K2LiAlF6. Moreover, K2LiAlF6:Mn4+ has an excellent thermal quenching behavior and color stability in the temperature range of 300–500 K, compared with the commercial red nitride phosphor (Sr)CaAlSiN3:Eu2+.

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      Most cited references 34

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      Solid-state light sources getting smart.

       T. J. Kim,  E Schubert (2005)
      More than a century after the introduction of incandescent lighting and half a century after the introduction of fluorescent lighting, solid-state light sources are revolutionizing an increasing number of applications. Whereas the efficiency of conventional incandescent and fluorescent lights is limited by fundamental factors that cannot be overcome, the efficiency of solid-state sources is limited only by human creativity and imagination. The high efficiency of solid-state sources already provides energy savings and environmental benefits in a number of applications. However, solid-state sources also offer controllability of their spectral power distribution, spatial distribution, color temperature, temporal modulation, and polarization properties. Such "smart" light sources can adjust to specific environments and requirements, a property that could result in tremendous benefits in lighting, automobiles, transportation, communication, imaging, agriculture, and medicine.
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        Inorganic Luminescent Materials: 100 Years of Research and Application

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          Advances in Phosphors for Light-emitting Diodes.

          Light-emitting diodes (LEDs) are excellent candidates for general lighting because of their rapidly improving efficiency, durability, and reliability, their usability in products of various sizes, and their environmentally friendly constituents. Effective lighting devices can be realized by combining one or more phosphor materials with chips. Accordingly, it is very important that the architecture of phosphors be developed. Although numerous phosphors have been proposed in the past several years, the range of phosphors that are suitable for LEDs is limited. This work describes recent progress in our understanding of the prescription, morphology, structure, spectrum, and packaging of such phosphors. It suggests avenues for further development and the scientific challenges that must be overcome before phosphors can be practically applied in LEDs.
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            Author and article information

            Affiliations
            [1 ]Ministry of Education Key Laboratory of Bioinorganic and Synthetic Chemistry
            [2 ]State Key Laboratory of Optoelectronic Materials and Technologies
            [3 ]KLGHEI of Environment and Energy Chemistry
            [4 ]School of Chemistry and Chemical Engineering
            [5 ]Sun Yat-sen University
            Journal
            JMCCCX
            Journal of Materials Chemistry C
            J. Mater. Chem. C
            Royal Society of Chemistry (RSC)
            2050-7526
            2050-7534
            2016
            2016
            : 4
            : 24
            : 5690-5695
            10.1039/C6TC01366J
            © 2016
            Product
            Self URI (article page): http://xlink.rsc.org/?DOI=C6TC01366J

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