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- W4362722365 abstract "Abstract Phosphors doped with Mn 4+ ions have strong emission in the red and far‐red light regions and are therefore used as red phosphors for indoor plant cultivation light‐emitting diodes (LEDs) and white LEDs (w‐LEDs). This paper introduces La 2 Mg(Mg 1/3 Ta 2/3 )O 6 : Mn 4+ (Mg 2 La 3 TaO 9 : Mn 4+ ) red phosphors prepared by conventional high‐temperature solid‐phase method. The broad excitation band of Mg 2 La 3 TaO 9 : Mn 4+ phosphor is effectively excited by ultraviolet and blue light in the range of 250–600 nm, with the emission of 707 nm centered on far‐red light. The phosphor has a high color purity of 99.07% and an internal quantum efficiency of 59.87%. To further enhance the performance of the phosphor, a cation substitution method was adopted in this paper to synthesize La 2 Mg(Al 1/2 Ta 1/2 )O 6 : Mn 4+ phosphor by replacing [1/3Mg 2+ –2/3Ta 5+ ] in La 2 Mg(Mg 1/3 Ta 2/3 )O 6 : Mn 4+ with [1/2Al 3+ –1/2Ta 5+ ]. The luminescence intensity and thermal stability of the samples were enhanced. The emission spectrum of the Mg 2 La 3 TaO 9 : Mn 4+ samples matched well with the phytochrome P FR (phytochrome that absorbs far‐red light) and is suitable for the preparation of LEDs for indoor plant cultivation. The concentration quenching effect of the samples was investigated, the main mechanism of which is the electric dipole–dipole interaction. Red LEDs and w‐LEDs devices were prepared with the synthesized phosphors that produce light stably at different currents. The w‐LEDs have a correlated color temperature of 5310 K and a color rendering index of 80.1. Therefore, these samples are expected to be used as red components for w‐LEDs." @default.
- W4362722365 created "2023-04-09" @default.
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- W4362722365 date "2023-04-16" @default.
- W4362722365 modified "2023-10-12" @default.
- W4362722365 title "Luminescence enhancement of Mn<sup>4+</sup>‐activated double‐perovskite phosphors for LEDs through a co‐replacement strategy" @default.
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- W4362722365 doi "https://doi.org/10.1111/jace.19143" @default.
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