Red phosphor and method of preparing the same, and red light emitting diode, white light emitting diode, and active dynamic liquid crystal device using the red phosphor

摘要

Provided is a red phosphor represented by formula 1: (Li_(2-z)-xM_x)(MoO₄)_y:Eu_z,Sm_q  (1) where M is an element selected from K, Mg, Na, Ca, Sr, and Ba, 0≦x≦2, 0.5≦y≦5, 0.01≦z≦1.5, and 0.001≦q≦1.0. The red phosphor has emission characteristics such as high brightness when excited by, in particular, an excitation light source of around 405 nm. The red phosphor is 6 times brighter than conventional phosphors. Furthermore, the red phosphor can be used in a red light emitting diode (LED) that has a UV excitation light source, a white LED, and an active dynamic liquid crystal device (LCD). In addition, the white LED using the red phosphor has a color rendering index of 90 or greater and so has excellent color rendition.