碳热还原氮化法合成稀土掺杂氮系荧光粉

Nitrogen System Phosphors Doping Rare Earth Fabricated by Carbothermal Reduction and Nitridation

采用碳热还原氮化法(CRN)制备了Eu2+掺杂SiN4-基氮化物、氮氧化物以及氧化物LED用荧光粉,通过X射线衍射仪和扫描电子显微镜对其结构和形貌进行分析,并通过激发-发射光谱研究了相关荧光粉的光谱特性。结果表明,随着氮化时间的延长以及氮化温度的升高,Eu2+掺杂的SrSiO3∶Eu2+、SrSi2O2N2∶Eu2+、Sr2Si5N8∶Eu2+荧光粉的主要成分比例发生变化,从而导致激发峰位发生变化,主要发射波长出现红移。这类荧光粉能够被近紫外-蓝光之间的光谱激发,呈现出橘红色、黄色、黄绿色、蓝绿色光发射。

A series of Eu2＋-doped SiN4-based nitride,oxynitride,oxide phosphors for LED were synthesized by using the method of carbothermal reduction and nitridation（CRN）. The structure and morphology o{ phosphors were investigated by X-ray diffraetion（XRD）and scanning electron microscope（SEM）respectively. Photolumineseence was researched by excitation and emission spectra of phosphors. The results showed that the main component proportion of Eu2＋ doped SrSiOa ： Eu2＋ , SrSi2 02 N2 ： Eu2＋ , St2 Sis N8 ： Eu2＋ phosphors altered along with extending nitriding time and increasing nitriding temperature, and their variation resulted in the change of excitation peak position, the main emission wavelength turned up redshift. These phosphors can be excited by both near UV and bluelight, present red-orange, yellow, yellow-green, blue-green broad emission.