[21p-S423-1~19] 13.9 Optical properties and light-emitting devices

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

〇Rong-Jun Xie¹, Le Wang², Wang Xiaojun¹, Kohsei Takahashi¹, Takashi Takeda¹, Naoto Hirosaki¹, Makoto Izumi³, Ken-ichi Yoshimura³ (1.NIMS, 2.China Jiliang Univ., 3.Sharp)

Keywords: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.