Green EuAlO3:Eu2+ nanophosphor for applications in WLEDs

Abstract Green-emitting aluminate nanophosphors fabricated by a pressure-assisted combustion synthesis ( P 0 = 1.4, 2.8 and 3.4 MPa) and annealed in pure H 2 is reported. The XRD analysis indicates the formation of the EuAlO 3 orthorhombic phase. Transmission electron microscopy (TEM) shows coalesced irregular grains with lengths in the range of 35–140 nm. In addition, the nanophosphor synthesized at an initial pressure of 3.4 MPa produced the highest green luminescence centered at 530 nm, which was associated to 4f 7 –4f 6 5d 1 allowed transitions of the Eu 2+ located into the EuAlO 3 :Eu 2+ compound. A weak red emission peak corresponding to Eu 3+ was also observed by cathodoluminescence. The CIE coordinates for green emission are x = 0.2613 and y = 0.3892, and the luminance produced from nanophosphors when they are excited with a commercial UV-396 nm LED (8.0 μW) was 285 ± 4.3 Cd/m 2 .