Green and red phosphor for LED backlight in wide color gamut LCD

Wide color gamut(WCG) backlight for liquid crystal display(LCD) utilizing white light-emitting diodes(LED) has attracted considerable attention for their high efficiency and color reduction.In this review,recent developments in crystal structure,luminescence and applications of phosphors for wide color gamut LED backlight are introduced.As novel red phosphors,Mnactivate fluoride and aluminate phosphors are advanced in quantum efficiency,thermal quenching and color saturation for their characteristic spectrum with broad excitation band and linear emission.The crystal structure and fluorescence properties of Mndoped fluosilicate,fluorogermanate,fluotitanate,as well as SrAlO,CaAlOand BaMgAlOphosphors are discussed in detail.A serial of narrow-band red-emitting Eu,Euand Pr-doped nitride silicates and molybdate phosphors are also introduced.Rare-earth-doped oxynitride and silicate green-emitting phosphors have attracted more and more attention because of the wide excitation,narrow emission,high quenching temperature,high quantum efficiency,such as β-sialon:Eu,BaSiON:Eu,MSiON:Eu(M=Ca,Sr,Ba),y-AlON:Mnand CaScSiO:Ce.All above phosphors demonstrate their adaptability in wide color gamut LCD display.Especially for Mndoped fluosilicate red phosphor and β-sialon:Eugreen phosphor.To achieve an ultra-high color gamut in white LED backlight and against the OLED,innovative narrow-band-emission red and green phosphor materials with independent intellectual property rights are continuously pursed.