Preparation and Photoluminescence of Green-Emitting Phosphors SrGa2S4:Eu

摘要

Europium ion doped strontium thiogallate (SrGa2S4:Eu) has been considered as an excellent green-emitting phosphor, due to the emission wavelength of 535 nm originated from the 4f~65d~1 → 4f~7 transition of Eu~(2+) ion in SrGa2S4:Eu. SrGa2S4:Eu have been widely used as the green-emitting phosphor for low voltage (< 2 kV) and moderate voltage (2-10 kV) field emission displays (FEDs). Recently, high luminescent blue light emitting diodes (LED) based on InGaN technology have been developed.The phosphor-converted white LED using blue LED is considered as one of the most important lightning sources, due to its long lifetime, low energy consumption, and eco-friendly materials, without any mercury. The conventional white LED is fabricated by coating yellow-emitting Y3Ah5O_(12)Ce phosphor onto the blue InGaN LED chip.