发光二极管用荧光材料Sr2CeO4:Sm3+的合成及其发光特性

以具有一维结构的Sr2CeO4化合物为研究对象、Sm3 作为发光中心,探索了其作为LED用荧光材料的可能性.用高温固相法于1200℃、6h合成了Sr2CeO4:Sm3 系列单相粉末样品,并研究了其发光性质.结果表明,在365nm激发下,从荧光光谱中可以看出存在从基质向稀土离子的能量转移.通过调节荧光材料Sr2CeO4:Sm3 中稀土离子Sm3 的掺杂浓度,可以调谐发光体的发光颜色,当Sm3 离子浓度较小(<3%)时,体系发出很强的白光;当Sm3 离子浓度较大(3%～15%)时,体系发出红光.测量了荧光材料的色坐标,发现Sr2CeO4:1%Sm3 的色坐标是(0.334,0.320),接近于纯白色(0.33,0.33),可以作为一种新型的UV-LED用单一白色荧光材料.     

A novel un-doped long lasting phosphorescence phosphor:SrZrSi2O7

A novel phosphor of un-doped Sr Zr Si2O7 material with blue long lasting phosphorescence which could be recorded for about 5400 s(0.32 mcd/m2) was developed. It revealed that both the emission centers and traps levels were related to the oxygen-deficient defects which were induced in reducing atmosphere. The filling and fading experiments indicated that the traps levels in Sr Zr Si2O7 were continuous in distribution. The influence of shallow traps on deep traps was investigated and the important role of the bridge effect was revealed. The un-doped Sr Zr Si2O7 material obtained in reducing atmosphere showed potential application as a cheap blue long lasting phosphorescence phosphor.