（1. Luoyang Single Crystal Silicon Co.Ltd.Luoyang 471009，China） （2. Northwest Institute for Nonferrous Metal Research，Xi an 710016，China）
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Abstract:
White light LED is a promising future lighting source，because it has many advantages including low voltage，low power consumption，high reliability，long service life，environment friendliness, and high energy efficiency，etc. Among the three major preparation methods，the one using blue，violet and near ultraviolet LED chip to excite the trichromatic phosphor or multichromatic phosphor based on red，green and blue phosphor is nowadays an acceptable solution，which possesses low cost and better chromogenic performance. However，red emitting phosphor，the key component in adjusting the color temperature and chromogenic performance in order to get high purity white light，is actually the bottleneck obstructing large scale application of white light LED. More than ten red emitting phosphor material systems for white light LED usage，their performances，preparation processes，and recent developments are introduced in detail, and the technology trends are briefly discussed.