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This work reports a wide color gamut backlight for liquid crystal display (LCD) utilizing a three-band white light-emitting diodes (LED). The LED backlight was fabricated by combining a blue LED chip with β-sialon:Eu (green) and CaAlSiN3:Eu (red) phosphors. This 2-phosphor-converted white LED shows a discrete spectrum with distinct separation of red, green, and blue primary colors due to a narrow and asymmetric emission band of the green phosphor. By applying typical color filters of LCDs and color-matching functions, a wide color gamut of 91.9% of the National Television Standard Committee standard is attained, compared to 71.6% for the conventional two-band white LED.
Xie et al. (Fri,) studied this question.
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