以稀土氧化物为原料,采用高温固相法,分别合成了钆、镨、以及钆镨共掺杂的YAG:Ce荧光粉。用荧光分光光度计对这几种荧光粉的激发光谱和发射光谱进行测试。结果表明,这几种荧光粉可以被蓝光(455-470 nm)有效激发;掺杂不同浓度的Gd3+可以使YAG:(Ce,Gd)荧光粉发射光谱的中心波长向红光波段产生不同程度红移;YAG:(Ce,Pr)荧光粉发射光谱新增610 nm处发射峰;YAG:(Ce,Pr,Gd)荧光粉的发射光谱不仅新增610 nm处的红峰而且有红移现象,这有效弥补了传统白光LED光谱中红光成份不足这一缺陷,对白光LED在高显色性要求领域的应用有重大的意义。

Using rare earth oxides as raw materials,YAG:Ce phosphors are prepared by solid-state reaction which dopes with praseodymium,gadolinium,as well as the praseodymium gadolinium altogether. The excitation and emission spectra of the phosphors are tested by fluorescence spectrophotometer. The results indicates that these phosphors can be excited by blue (455-470 nm) light effectively. The center wavelength of theYAG:(Ce,Gd) emission spectra occurs red shift differently by justing the mol density of doping Gd3+ions,there is a new emission wave crest at about 610 nm in the YAG:(Ce,Pr) emission spectra;not only a new emission wave crest at about 610 nm but also the center wavelength occurs red shift existed in the YAG:(Ce,Pr,Gd) emission spectra. So the flaw of the traditional light emitting diode,lacking of red emitting in the spectra,can be effectively improved. It will be very important for light emitting diode to apply in high colour rendering required field.