Rare-earth (Eu3+, Tb3+) ion co-doped YBO3 phosphors with a morphology of uniform flower-like assembly are fabricated by a facile hydrothermal method without the use of surfactant, organic ligands, or further sintering treatment. Photoluminescence (PL) studies have demonstrated that under the excitation of 365 nm ultraviolet (UV) light, YBO3: Tb3+, Eu3+ emits a white light, including three emissions: a blue band attributed to self-trapped excitons (STEs), a green band due to the Tb3+ transition of D-5(4)-F-7(j) (j = 6, 5, 4, and 3), and a red band due to the Eu3+ transition of D-5(0)-F-7(j) (j = 0, 1, 2, 3, and 4). Energy transfers from host YBO3 to Tb3+, and Eu3+ and Tb3+ to Eu3+, as well as tunable emission by varying the relative doping ratios are demonstrated. The combination of blue emission from STEs with green and red emissions from activators provides a novel and efficient technique to make white light emitting diodes (WLEDs).
|Journal||Journal of Materials Chemistry C|
|State||Published - 2013|