采用高温固相法制备了Eu2+掺杂的硫化锶/铝酸锶复合荧光体样品,研究了样品随组成成分变化的相变过程及其光谱特性.结果表明,随着n( SrSO44 )/n(SrCO3+SrSO4)值的增加,样品中铝酸锶成分逐步由SrAl2O4相向SrAl4O7相转变.在469nm激发下,当SrSO4达到8％(摩尔分数)时红光发射强度最强.此外,该复合荧光体能在417nm激发下得到红绿双波段荧光,且红、绿荧光相对强度可通过变化基质成分实现调节,在近紫外LED照明上具有潜在的应用价值.更重要的是,该复合荧光体中的SrS成分在铝酸盐的包覆下耐水性得到显著改善,有效增强了其实用性.
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