Abstract
Nitride phosphors, showing very promising photoluminescence properties, are now attracting great attention as down-conversion luminescent materials in white light emitting diodes (wLEDs). Their interesting cathodoluminescence properties, such as high stability and reliability against electron bombardment, also enable them to be used in white flat field emission lamps (FELs). Dual-band white FELs were prepared by using blue AlN:Eu2+ and yellow Ca-α-sialon:Eu2+ in this work. These FELs show no luminance saturation and stable chromatic coordinates with increasing anode voltage and current. Driven at 7 kV and 100 μA, the white FEL with the AlN:Eu2+ to Ca-α-sialon:Eu2+ ratio of 0.65 to 0.35 has the luminance of 3,412 cd/m2, a color temperature of 3,430 K, and a color rendering index of 76. Higher color rendition of 93-95 can be obtained by using the phosphor blend of AlN:Eu2+, β-sialon:Eu2+ (green) and CaAlSiN3:Eu2+ (red). It indicates that nitride phosphors could be used as robust emissive materials in highly reliable white FELs.
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