Preparation and optical properties of a novel double-perovskite phosphor,Ba2GdNbO6:Mn4+, for light-emitting diodes |
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| Affiliation: | 1. Departamento de Física, Universidade Federal de Sergipe, 49500-000, Itabaiana, SE, Brazil;2. Departamento de Física, Universidade Federal de Sergipe, 49100-000 São Cristóvão, SE, Brazil;3. Departamento de Física, CCET, Universidade Federal do Maranhão, 65085-580 São Luís, MA, Brazil;4. Department of Materials Science and Engineering, University of California Berkeley, 94720-1760 Berkeley, CA, United States;5. Department of Physics, University of California Berkeley, 94720-7300 Berkeley, CA, United States;1. College of Mathematics and Physics, Jinggangshan University, Ji’an 343009, China;2. College of Mechanical Manufacture and Automation, Jinggangshan University, Ji’an 343009, China |
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| Abstract: | Red phosphors serve an important function as red components of warm white light-emitting diodes (WLEDs). Given their remarkable luminescent properties and low cost, Mn4+-doped phosphors are attracting significant attention. In this study, the novel red phosphor Ba2GdNbO6:Mn4+ was synthesized through high-temperature solid-state reaction. The host Ba2GdNbO6 with a double-perovskite structure was investigated. Scanning electron microscopy and thermogravimetric analysis were performed to evaluate the structure and thermal stability of the phosphor, respectively. PLE and photoluminescence spectra were further used to study the luminescence properties of the phosphor. Moreover, crystal field strength and Racah parameters were calculated to estimate the nephelauxetic effect of Mn4+ on the Ba2GdNbO6 host lattice. Thermal quenching characteristics were also analyzed. The fabricated red-emitting LED revealed its potential application in WLEDs. |
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| Keywords: | Red phosphor Luminescence Thermal quenching |
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