Mn4+-activated KLaMgWO6: A new high-efficiency far-red phosphor for indoor plant growth LEDs |
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Authors: | Jia Liang Balaji Devakumar Liangling Sun Qi Sun Shaoying Wang Bin Li Daqin Chen Xiaoyong Huang |
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Affiliation: | 1. College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, PR China;2. College of Physics and Energy, Fujian Normal University, Fuzhou, Fujian 350117, PR China |
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Abstract: | Novel Mn4+-activated KLaMgWO6 red phosphors with different Mn4+ concentrations were successfully synthesized via a high-temperature solid-state reaction method. The phase formation, microstructure, photoluminescence properties, decay lifetimes and internal quantum efficiency were discussed to analyze the properties of the as-prepared phosphors. The samples belonged to monoclinic crystal system with enough WO6 octahedrons that provided suitable sites for Mn4+ ions. Upon the excitation of 348?nm, KLaMgWO6:Mn4+ phosphors gave bright far-red emission around 696?nm due to the 2Eg→4A2g transition of Mn4+ ions. The critical concentration of Mn4+ was 0.6?mol% and the concentration quenching mechanism belonged to electric multipolar interaction. Besides, the CIE chromaticity coordinates of the KLaMgWO6:0.6%Mn4+ phosphor were (0.7205, 0.2794) which located in deep red range, and its color purity reached up to 96.6%. The KLaMgWO6:0.6%Mn4+ sample also exhibited high internal quantum efficiency of 43%. All of the admirable optical properties indicate that the KLaMgWO6:Mn4+ phosphors can be applied to indoor plant growth illumination. |
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Keywords: | Far-red-emitting phosphors Luminescence properties Indoor plant growth |
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