Therefore, the development of color-tunable phosphors on a single-phase substrate is a highly significant research direction within the field of white light-emitting diodes (WLEDs).
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Energy transfer mechanisms and color-tunable luminescence of Tm<sup>3+</sup>/Tb<sup>3+</sup>/Eu<sup>3+</sup> co-doped Sr<sub>4</sub>Nb<sub>2</sub>O<sub>9</sub> phosphors for high-quality white light-emitting diodes.
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