A liquid crystal display device includes a light source and a liquid crystal display panel. The light source includes a blue-emitting phosphor configured to emit blue light, a green-emitting phosphor configured to emit green light, and a red-emitting phosphor configured to emit red light. The liquid crystal display panel includes color filters configured to control the transmittance of light from the light source and transmit one of blue, green, and red light on a pixel basis. The green-emitting phosphor is represented by a compositional formula of (La.sub.1-x-y,Tb.sub.x,Ce.sub.y)PO.sub.4, wherein "x" and "y" are compositional ratios satisfying both the following conditions: 0.500<(x+y)<0.700 and 1.20<(y/x)<2.00. The compositional ratios "x" and "y" preferably satisfy the following conditions: 0.50<(x+y)<0.65 and 1.50<(y/x)<1.70.