Patent ID: 8810124

Claim:
An alternating current (AC) light emitting device, comprising: a light emitting diode chip comprising light emitting cells and comprising an upper surface, the upper surface comprising a first region and a second region; a first long-persistent phosphor configured to change a wavelength of light emitted from the light emitting diode chip; and a second long-persistent phosphor configured to change a wavelength of light emitted from the light emitting diode chip, wherein the first ling-persistent phosphor only covers the first region of the upper surface of the light emitting diode chip, and the second long-persistent phosphor only covers the second region of the upper surface of the light emitting diode chip, wherein the amount of the second long-persistent phosphor is different from that of the first long-persistent phosphor, wherein the first region of the upper surface of the light emitting diode chip does not directly contact the second region, and wherein the decay times of the first long-persistent phosphor and the second long-persistent phosphor are in the range of 1 millisecond to several seconds, and the first long-persistent phosphor and the second long-persistent phosphor differ from each other in afterglow luminance periods.