Green EuAlO3:Eu2+ nanophosphor for applications in WLEDs

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 EuAlO3 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 Eu2+ located into the EuAlO3:Eu2+ compound. A weak red emission peak corresponding to Eu3+ 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 mu W) was 285 +/- 4.3 Cd/m(2). (C) 2014 Elsevier B.V. All rights reserved.