Rensselaer researchers have developed a new class of phosphors that have narrow spectral linewidths suitable for high-efficiency, white light LED fabrication for lighting and display applications. These phosphors can be efficiently excited by near UV and blue LEDs such as in 400 nm LEDs and can provide emission in green, yellow, amber and red wavelengths. Commercial phosphor-converted white LEDs lack narrow-emitting red phosphors that are effectively excited by blue or near ultraviolet LEDs. This technology relates to phosphors in powder and crystal form of various compositions that are effectively excited by bluenear ultraviolet LEDs and emit in the visible light spectrum of the human eye. These phosphors have crystallographic structures that are engineered to provide an extension of the Charge Transfer Band (excitation band) in the blue wavelength region (400490 nm) resulting in narrow spectral lines with peak emission at different wavelengths in the visible spectrum range (500-700nm) with maximum efficiency and deliverance of high color quality. This new class of phosphor compounds was created using solid state reaction and flux growth methods at high temperature ranges under a variety of ambient conditions such as oxygen, inert gas, and vacuum. Applications of this technology includes the development of LEDs. Advantage includes enabling fabrication of high efficient LEDs with high color quality.