| Summary: | Transparent ceramics (Gd<sub>0.975−<i>x</i></sub>Lu<i><sub>x</sub></i>Dy<sub>0.025</sub>)<sub>3</sub>Al<sub>5</sub>O<sub>12</sub> (x = 0.2, 0.5, 0.975) are fabricated by vacuum sintering with the transmittance of ~60% at 583 nm. The doping of Lu<sup>3+</sup> was beneficial to stabilize the garnet phase, and the best doping concentration was 20 at.%. All three (Gd, Lu)<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>:Dy ceramics display typical Dy<sup>3+</sup> emission, originating from <sup>4</sup>F<sub>9/2</sub> → <sup>6</sup>H<sub>J</sub> (J = 15/2, 13/2, 11/2) transition. Temperature-dependent luminescence spectra from 303.15 K to 603.15 K prove that the (Gd, Lu)<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>:Dy ceramics had good thermal stability and could be an ideal yellow-emitting candidate in light-emitting diodes. The luminous efficiency of the encapsulated white LED lamp was found to be ~87.9 lm/W when the injection current was 600 mA. The transparent (Gd, Lu)<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>:Dy ceramics show great application potential in various optical systems especially in the fields of luminescence and display.
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