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      Optimized photoluminescence of red phosphor Na2 SnF6 :Mn4+ as red phosphor in the application in “warm” white LEDs

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          Phosphors in phosphor-converted white light-emitting diodes: Recent advances in materials, techniques and properties

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            Highly efficient non-rare-earth red emitting phosphor for warm white light-emitting diodes.

            Mn(4+)-activated fluoride compounds, as an alternative to commercial (oxy)nitride phosphors, are emerging as a new class of non-rare-earth red phosphors for high-efficacy warm white LEDs. Currently, it remains a challenge to synthesize these phosphors with high photoluminescence quantum yields through a convenient chemical route. Herein we propose a general but convenient strategy based on efficient cation exchange reaction, which had been originally regarded only effective in synthesizing nano-sized materials before, for the synthesis of Mn(4+)-activated fluoride microcrystals such as K2TiF6, K2SiF6, NaGdF4 and NaYF4. Particularly we achieve a photoluminescence quantum yield as high as 98% for K2TiF6:Mn(4+). By employing it as red phosphor, we fabricate a high-performance white LED with low correlated colour temperature (3,556 K), high-colour-rendering index (Ra=81) and luminous efficacy of 116 lm W(-1). These findings show great promise of K2TiF6:Mn(4+) as a commercial red phosphor in warm white LEDs, and open up new avenues for the exploration of novel non-rare-earth red emitting phosphors.
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              Recent developments in the new inorganic solid-state LED phosphors

              The emerging new solid-state LED phosphors and the methodologies for their development have been reviewed in this perspective. Stable and efficient phosphor systems for white light-emitting diodes (LEDs) are highly important with respect to their application in solid-state lighting beyond the technical limitations of traditional lighting technologies. Therefore, inorganic solid-state conversion phosphors must be precisely selected and evaluated with regard to their special material properties and synergistic optical parameters. In this perspective, we present an overview of the recent developments of LED phosphors; firstly, general photoluminescence-controlling strategies for phosphors to match LED applications have been evaluated; secondly, state-of-the-art and emerging new LED phosphors have been demonstrated. Then, methodologies for the discovery of new LED phosphors by mineral-inspired prototype evolution and new phase construction, as well as combinatorial optimization screening, and the single-particle-diagnosis approach, have been analyzed and exemplified. Finally, future developments of LED phosphors have been proposed.
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                Author and article information

                Journal
                Journal of the American Ceramic Society
                J Am Ceram Soc
                Wiley
                00027820
                May 2017
                May 2017
                February 21 2017
                : 100
                : 5
                : 2005-2015
                Affiliations
                [1 ]Key Laboratory of Carbon Materials of Zhejiang Province; College of Chemistry and Materials Engineering; Wenzhou University; Wenzhou China
                [2 ]Key Laboratory of Optoelectronic Materials Chemistry and Physics; Chinese Academy of Sciences; Fuzhou Fujian China
                [3 ]MOE Key Laboratory of Bioinorganic and Synthetic Chemistry/School of Chemistry and Chemical Engineering; Sun Yat-Sen University; Guangzhou China
                Article
                10.1111/jace.14708
                265c4395-f9ad-45e0-bea4-ed15f2215a93
                © 2017

                http://doi.wiley.com/10.1002/tdm_license_1

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