制备了一种新型的Eu2+/Sm3+共掺硅酸盐玻璃,研究了Eu2+/Sm3+共掺硅酸盐玻璃的热稳定性能和发光特性。研究发现,在近紫外光360 nm激发下,在室温下同时观察到明显的蓝绿光(475 nm)、黄光(562 nm)、橙光(599 nm)和红光(644 nm和706 nm)发光。其中蓝绿光(475 nm)是由于Eu2+的4f65d1→4f7辐射跃迁,黄光(562 nm)是由于Sm3+的4G5/2→6H5/2辐射跃迁,橙光(599 nm)是由于Sm3+的4G5/2→6H7/2辐射跃迁,红光(644 nm和706 nm)是由于Sm3+的4G5/2→6H9/2和4G5/2→6H11/2辐射跃迁。随着Sm3+离子浓度的增加,Eu2+/Sm3+共掺硅酸盐玻璃的色度从蓝绿光区域逐渐向白光区域移动。当Eu2+,Sm3+掺杂摩尔分数分别为0.05%和1.0%时,硅酸盐玻璃的色坐标为(0.312,0.307),接近纯白色点的色坐标 (0.333,0.333)。研究结果表明,Eu2+/Sm3+掺杂硅酸盐玻璃是一种潜在的白光LED基质材料。

A new Eu2+/Sm3+ co-doped silicate glass was prepared,and its thermal stability and optical properties were studied. The intense blue (475 nm),yellow (562 nm),orange (599 nm) and red (644 and 706 nm) emissions were simultaneously observed at the room temperature under the excitation at 360 nm. The blue (475 nm) luminescence is due to the 4f65d1→4f7 transition of Eu2+,the yellow (562 nm) luminescence is due to the 4G5/2→6H5/2 transition of Sm3+,the orange (599 nm) luminescence is due to the 4G5/2→6H7/2 transition of Sm3+ and the red (644 and 706 nm) luminescence is due to the 4G5/2→6H9/2 and 4G5/2→6H11/2 transitions of Sm3+,respectively. With the increase of the concentration of Sm3+ ions,the hue of Eu2+/Sm3+ co-doped silicate glass varies gradually from greenish blue eventually to white. When the doped molar fraction of Eu2+ and Sm3+ ions are 0.05% and 1.0% respectively,the chromaticity coordinate of the glass is measured to be (0.312,0.307),which is close to the standard pure white (0.333,0.333). The results indicate that Eu2+/Sm3+ co-doped silicate glass is potential materials for white light-emitting diodes (WLED).