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      The design and preparation of the thermally stable, Mn4+ ion activated, narrow band, red emitting fluoride Na3GaF6:Mn4+ for warm WLED applications

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          Abstract

          Herein, a new red phosphor Na 3GaF 6:Mn 4+ has been designed and synthesized by a facile two-step co-precipitation method at room temperature.

          Abstract

          Herein, a new red phosphor Na 3GaF 6:Mn 4+ has been designed and synthesized by a facile two-step co-precipitation method at room temperature. Single crystal X-ray diffraction analysis reveals that the fluoride Na 3GaF 6 crystallizes in the P2(1)/ n space group with a = 5.4760 Å, b = 5.6862 Å, c = 7.9009 Å, β = 90.309°, and z = 2. Upon blue or UV light excitation, the obtained phosphor Na 3GaF 6:Mn 4+ emits intense and pure red fluorescence. The effects of raw materials, doping concentration and environmental temperature on its luminescence properties and crystal structure have been investigated and discussed in detail. Such a newly synthesized red phosphor shows excellent anti-thermal quenching behavior (∼118.8% of emission intensity at 150 °C relative to 25 °C) and good color stability upon blue light (∼467 nm) excitation. By using the Na 3GaF 6:Mn 4+ phosphor as a red light component, a high-power stable warm white light-emitting diode (WLED, R a = 81, CCT = 2966 K, luminous efficacy = 56.73 lm W −1) was fabricated, further evidencing the potential of the as-synthesized Na 3GaF 6:Mn 4+ phosphor for white LED applications.

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          Efficient iterative schemes forab initiototal-energy calculations using a plane-wave basis set

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            Solid-state light sources getting smart.

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

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                Author and article information

                Journal
                JMCCCX
                Journal of Materials Chemistry C
                J. Mater. Chem. C
                Royal Society of Chemistry (RSC)
                2050-7526
                2050-7534
                2017
                2017
                : 5
                : 11
                : 2910-2918
                Affiliations
                [1 ]State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials
                [2 ]South China University of Technology
                [3 ]Guangzhou 510641
                [4 ]China
                [5 ]Jiangxi Honglitronic Co., Ltd.
                [6 ]Nanchang
                [7 ]State Key Laboratory of Optoelectronic Materials and Technologies
                [8 ]School of Chemistry and Chemical Engineering
                [9 ]Sun Yat-Sen University
                [10 ]Guangzhou 510275
                Article
                10.1039/C7TC00011A
                2cde2e44-18d8-4d4c-b0e7-dcb4929f3ddc
                © 2017
                History

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