A novel strongly yellow-emitting Dy3+: NaGdGeO4 phosphor with excellent thermal stability
摘要
A series of novel Dy3+: NaGdGeO4 phosphors were prepared by a facile high-temperature solid-phase method. Its electronic structures were investigated using first-principles based on DFT. These phosphors kept stable phase structure and displayed strongly yellow emission under the excited wavelength of 347 nm. It presented excellent thermal stability (77% of room temperature emission intensity at 416 K). In addition, some other luminescent properties like the level lifetime (338 µs), IQE (40.86%) and CCT (3179 K) were discussed respectively. These results showed it could be used as a kind of valuable yellow phosphor for LED.