New green garnet-type phosphor LuMgAl5SiO12:Ce3+ for filling cyan gap to achieve full-spectrum and high colour-rendering-index white light-emitting diodes
Phosphors with simple preparation, high luminous efficiency and excellent thermal stability are highly desirable for commercial white light-emitting diodes (W-LED). In the paper, a new garnet-type green phosphor LuMgAl 5 SiO 12 :Ce 3+ (LMASO:Ce 3+ ) has been successfully prepared by a high-temperature solid-state reaction. The crystal structure and photoluminescence properties were investigated in detail. X-ray diffraction and the Rietveld refinement demonstrated the crystal structure of LMASO belongs to cubic systems with an Ia 3 ¯ d (2 3 0) space group. The unit cell parameters of LMASO:0.08Ce 3+ phosphor were found to be a = 11.90418 Å and V = 1686.935 Å 3 . LMASO:Ce 3+ phosphors have two excitation bands with peaks at 340 and 436 nm, attributed to the 4f → 5d transition of Ce 3+ ions. Under excitation at 436 nm, LMASO:0.08Ce 3+ phosphor exhibits a broad and asymmetric emission band in the 450–700 nm range. Notably, a W-LED device was created by combining a 455 nm blue LED chip with the obtained green sample and the commercially available red CaAlSiN 3 :Eu 3+ phosphor. The device emitted a bright warm white light with a low correlated color temperature of 3584 K and a high color rendering index of 96.0 at a drive current of 40 mA. The article indicates that LMASO:Ce 3+ samples can serve as a potential green phosphor for W-LEDs, and offers a new strategy for designing efficient phosphors.
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