Abstract
We fabricated a series of Y3Al5O12:Mn4+ and Y1−yLuyAl5O12:Mn4+ phosphors by a solid state reaction. The phase and the optical properties of the synthesized phosphors were investigated. Under the excitation at 465 nm, Y3Al5O12:Mn4+ phosphors show emission bands locating at deep red regions, which is induced by the spin- and parity-forbidden 2Eg → 4A1g transitions of Mn4+. The substitution of Y3+ by Lu3+ decreases the lattice parameter and thus strengthens the crystal field strength, which gives rise to the blue shift of emission band for Y1−yLuyAl5O12:Mn4+ phosphors. Due to the compensation of red light by Y3Al5O12:Mn4+ or Y1−yLuyAl5O12:Mn4+ phosphor, the values of correlated-color-temperature for fabricated LEDs are decreased, which leads to the suitable application for them in indoor illumination.
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