Abstract
YGG:Dy and YGG:Cr polycrystalline ceramics were prepared via a solid-state reaction-two step sintering approach. The crystalline structure, phase evolution, morphologies and luminescence properties of as prepared transparent ceramics were intensively investigated. In-line transmittance of YGG:Dy and YGG:Cr transparent ceramics can reach up to 70.6% and 67.3% at 1200 nm, respectively. For YGG:Dy transparent ceramic, three emission bands centered at 492 nm, 581 nm and 669 nm can be observed under excitation of 353 nm. Its CIE color coordinate is (0.3182, 0.3326) under UV irradiation, which is a promising UV-converting candidate for WLEDs. While the emission peak of YGG:Cr transparent ceramic is at about 709 nm, which can be one of the candidate materials applied in red-emitting LEDs with excellent color rendering index. The experimental results demonstrate that Y3Ga5O12:M3+ (M = Dy, Cr) transparent ceramics are promising novel luminescent materials for LEDs.
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