【摘 要】
：
具有宽发光波段的荧光材料在照明、光通讯等许多技术领域均发挥着关键作用。众所周知,由过渡金属离子的d-d 跃迁或稀土离子的d-f 跃迁导致的发光,其发光峰的波长受到发光离子化学环境的显著影响。基于该现象,我们提出通过制备具有成分梯度的薄膜,以实现薄膜中发光离子化学环境的多样化,进而获得宽发光波段的技术途径。利用射频共溅射技术制备了具有可调光致发光特性的Ca1-xSrxS：Eu 薄膜。通过调节CaS：
【机 构】
：
深圳大学化学与化工学院,广东深圳,518060;Laboratory of Glasses&Ceramics University of Rennes 1,Rennes France,35042
论文部分内容阅读
具有宽发光波段的荧光材料在照明、光通讯等许多技术领域均发挥着关键作用。众所周知,由过渡金属离子的d-d 跃迁或稀土离子的d-f 跃迁导致的发光,其发光峰的波长受到发光离子化学环境的显著影响。基于该现象,我们提出通过制备具有成分梯度的薄膜,以实现薄膜中发光离子化学环境的多样化,进而获得宽发光波段的技术途径。利用射频共溅射技术制备了具有可调光致发光特性的Ca1-xSrxS：Eu 薄膜。通过调节CaS：Eu 与SrS：Eu 双靶的溅射功率,可实现对薄膜组分的连续调节,进而实现薄膜在蓝光激发下的光致发光由黄光向红光的连续变化。在单次溅射中逐步改变双靶的溅射功率比例,可获得具有成分梯度的薄膜。测试得出该荧光梯度薄膜在黄/红光波段的半高宽达92 nm,荧光量子效率达45％。该薄膜可用于改善LED 白光照明的显色性能。计算表明将该薄膜应用于涂敷有YAG：Ce 的蓝光LED,其显色指数可达到93％。
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