The Enhanced Red Emission and Improved Thermal Stability of CaAlSiN(3):Eu(2+) Phosphors by Using Nano-EuB(6) as Raw Material

Synthesizing phosphors with high performance is still a necessary work for phosphor-converted white light-emitting diodes (W-LEDs). In this paper, three series of CaAlSiN(3):Eu(2+) (denoted as CASN:Eu(2+)) phosphors using Eu(2)O(3), EuN and EuB(6) as raw materials respectively are fabricated by under the alloy precursor normal pressure nitridation synthesis condition. We demonstrate that CASN:Eu(2+) using nano-EuB(6) as raw material shows higher emission intensity than others, which is ascribed to the increment of Eu(2+) ionic content entering into the crystal lattice. An improved thermal stability can also be obtained by using nano-EuB(6) due to the structurally stable status, which is assigned to the partial substitution of Eu–O (Eu–N) bonds by more covalent Eu–B ones that leads to a higher structural rigidity. In addition, the W-LEDs lamp was fabricated to explore its possible application in W-LEDs based on blue LEDs. Our results indicate that using EuB(6) as raw materials can provide an effective way of enhancing the red emission and improving the thermal stability of the CASN:Eu(2+) red phosphor.