Structural modulation designed a thermally robust blue-cyan emitting phosphor Y2Mg0.8Sr0.2 Al4SiO12:Eu2+ for the high color rendering index white LEDs

In this work, the novel, to the best of our knowledge, blue-cyan Y2Mg0.8Sr0.2Al4SiO12:Eu2+ (YM(0.8)S(0.2)AS:Eu2+) phosphors were synthesized by the solid-state method. At 150 degrees C, the emission intensity of Y2Mg0.8Sr0.2Al4SiO12:0.005Eu(2+) can retain 96.38% of the relative intensity, which means that this phosphor shows high thermal stability. A white light-emitting diode (LED) device is fabricated by combining a 370 nm near ultraviolet LED chip and commercial phosphors (green, Ba, Sr)(2)SiO4:Eu; red, CaSiAlN3:Eu). The white LED has an excellent property with the correlated color temperature CCT = 5236 K and superhigh color rendering index Ra = 96.1, which indicates the potential application in white LED fields. (C) 2021 Optical Society of America