Application of strontium silicate yellow phosphor for white light-emitting diodes

摘要

In order to develop a yellow phosphor that emits efficiently under the 450-470 nm excitation range, we have synthesized a Eu~(2+)-activated Sr_(3)SiO_(5) yellow phosphor and attempted to develop white light-emitting diodes (LEDs) by combining them with a InGaN blue LED chip (460 nm). Two distinct emission bands from the InGaN-based LED and the Sr_(3)SiO_(5):Eu phosphor are clearly observed at 460 nm and at 570 nm, respectively. These two emission bands combine to give a spectrum that appears white to the naked eye. Our results showed that InGaN (460 nm chip)-based Sr_(3)SiO_(5):Eu exhibits a better luminous efficiency than that of the industrially available product InGaN (460 nm chip)-based YAG:Ce.