The synthesis and photoluminescence of a single-phased white-emitting NaAlSiO4: Ce3+, Mn2+ phosphor for WLEDs

A series of blue-to-white emitting phosphors NaAlSiO4: Ce3+, Mn2+ were synthesized via a high-temperature solid-state method. The obtained phosphors exhibited a broad excitation band from 250 to 400 nm peaking at 350 nm, matching well with the available UV chips. Under the excitation of 350 nm, a broad green-blue emission band peaking at 430 nm and an orange-red emission band at 590 nm were observed due to the f-d transition of Ce3+ and the T-4(1)-(6)A(1) transition of Mn2+, respectively. Moreover, energy transfer process from Ce3+ to Mn2+ was verified with the mechanism to be dipole-quadrupole interaction. By varying the doping concentration of Mn2+, tunable colors from blue to white were obtained in the phosphors. The results indicate that this phosphor has potential applications as a single-phased aluminosilicate phosphor for ultraviolet white light-emitting diodes (UVWLEDs). (C) 2015 Elsevier Ltd. All rights reserved.