摘要
以硝酸锶、七钼酸铵、氧化镨为原料,采用低温燃烧法合成白光发光二极管(white light emitting diode,简称WLED),用新型红色荧光粉SrMoO4:Pr3+,并研究其光谱性质。结果表明,SrMoO4:Pr3+激发光谱中Pr3+在449 nm处有一最强3H4-->3P0激发峰,其激发范围与蓝光LED芯片相匹配,能被蓝光有效激发;发射光谱在644nm处有最强峰,属于Pr3+的3P0-->3F2跃迁,发红光,说明SrMoO4:Pr3+荧光粉是1种潜在的白光LED用蓝光激发的红色荧光粉。同时还研究了燃烧温度、尿素用量、稀土Pr3+掺杂量对荧光粉发光强度的影响,得出制备SrMoO4:Pr3+的最佳条件为:燃烧温度600℃,尿素用量为理论尿素用量的3倍,稀土Pr3+离子掺杂摩尔分数为2%。
A novel red phosphor tervalent praseodymium （Pr3＋） doped strontium molybdate （SrMoO4） for white light emitting diode WLED was synthesized by the low temperature combustion method using Sr（NO3）2, （NH4）6Mo7O24.4H2O and Pr6O11 as raw materials, and its luminescent properties were studied. It is found that phosphor with the highest peak in excitation spectrum located at 449nm （3H4-〉3P0） is suitable for blue LED chips which can be excited by these energy. The highest peak in emission spectrum is located at 644nm due to 3P0-〉3F2 transition of Pr ion, the phosphor is emitted red light. These results show that the SrMoO4：Pr3＋phosphor is a promising red phosphor for blue LED chips based on white light emitting diode. The influences of luminescent intensity with different calcining temperature, urea dosage and the concentration of Pr ion were also investigated. The results indicate that the suitable calcining temperature is 600℃, the best urea dosage is 3 times of the molar amount of its theoretical value and the optimal mol fraction content of pr3＋ion is 2%.
出处
《粉末冶金材料科学与工程》
EI
北大核心
2014年第2期302-306,共5页
Materials Science and Engineering of Powder Metallurgy
基金
长沙市科技重大专项(K080105-11)
