Abstract: A lutetium-based phosphor having the chemical formula: xLu3Al5O12.yGd3Al5O12:CePrEuTb, and being capable of radiating reddish orange-red spectrum when activated by a shortwave light emitted by an InGaN light-emitting diode. The invention also discloses a warm white LED using the lutetium-based phosphor that produces orange-red light having the peak wavelength ?max>560 nm, half width>125 nm and color rendering index Ra?75 when activated by the LED radiation ?=420˜500 nm.

Abstract: A photovoltaic cell is disclosed to include a monocrystalline silicon wafer, and a transparent light conversion powder which is made in the form of a polymer layer with a transparent phosphor powder filled therein and kept in contact with the outer surface of the monocrystalline silicon wafer to enhance the absorption of the short-wavelength radiation ultraviolet ?<480 nm of the sun and to re-radiate in the wavelength range ?=500˜980 nm, wherein the phosphor powder is formulated as MeIIO.xB2O3:EuCePrTbLi, in which MeII=(Mg+2,Ca+2,Sr+2,Ba+2), 0.1<x<10, preferably in the range of 0.5<x<2. Furthermore, the invention also provides a transparent light conversion powder for photovoltaic cells.

Abstract: A lutetium-based phosphor having the chemical formula: xLu3Al5O12.yGd3Al5O12:CePrEuTb, and being capable of radiating reddish orange-red spectrum when activated by a shortwave light emitted by an InGaN light-emitting diode. The invention also discloses a warm white LED using the lutetium-based phosphor that produces orange-red light having the peak wavelength ?max>560 nm, half width>125 nm and color rendering index Ra?75 when activated by the LED radiation ?=420˜500 nm.