[21p-S423-1~19] 13.9 光物性・発光デバイス

▲ [21p-S423-3] Wider Color Gamut LED Backlight using β-sialon:Eu²⁺ and K₂SiF₆:Mn⁴⁺ Phosphors

〇解 栄軍¹、王 楽²、王 暁君¹、高橋 向星¹、武田 隆史¹、広崎 尚登¹、和泉 真³、吉村 健一³ (1.物材機構、2.中国計量学院、3.シャープ)

キーワード：Phosphor,LED backlight,Narrow-band

In this presentation, we propose to combine both narrow-band green (β-sialon:Eu²⁺) and red (K₂SiF₆:Mn⁴⁺) phosphors with a blue InGaN chip to achieve white light-emitting diodes (wLEDs) with a large color gamut and a high efficiency for use as the liquid crystal display (LCD)backlighting. The prepared three-band wLEDs have a high color temperature of 11,184 - 13,769 K (i.e., 7,828 - 8,611 K for LCD displays), and a luminous efficacy of 91 – 96 lm/W, measured under an applied current of 120 mA. The color gamut defined in the CIE 1931 and CIE 1976 color spaces are 85.5 - 85.9% and 94.3 - 96.2% of the NTSC standard, respectively.