近紫外光LED芯片用红色荧光粉SrIn_2O_4:Eu^(3+),Sm^(3+)的制备及性能研究

Study on Luminescent Properties of SrIn_2O_4:Eu^(3+),Sm^(3+)Red-emitting Phosphor for White Light-emitting Diodes

利用高温固相法制备了Eu^(3+)、Sm^(3+)单掺杂及共掺杂的SrIn_2O_4荧光材料.通过XRD、激发光谱、发射光谱等对SrIn_2O_4∶Eu^(3+)、Sr In_2O_4∶Sm^(3+)、Sr In2O4∶Eu^(3+),Sm^(3+)进行表征。结果表明,Sr In2O4∶Eu^(3+)在近紫外光395 nm激发下能够有效的产生616 nm的红光发射.在Sr In2O4∶Sm^(3+)体系中发现,该系列样品适合于407 nm的紫光激发,发射峰位于607 nm.在Sr In_2O_4∶Eu3^(3+)Sm^(3+)体系中,通过光谱分析发现,基质中存在Eu^(3+)和Sm^(3+)激活剂之间的相互能量传递过程.该能量传递过程使Sr In2O4∶Eu^(3+),Sm^(3+)更适合于390~410 nm紫外芯片激发的LED用红色荧光粉。

The SrIn_2O_4 with Eu^(3+)or Sm^(3+)singly doped and co-doped were prepared by high temperature solid state reaction. All the samples were characterized by XRD,emission spectra and excitation spectra.The results show that the sample SrIn_2O_4∶ Eu^(3+)can be excited by 395 nm to give 616 nm red emission.The sample SrIn_2O_4∶ Sm^(3+)can be excited by 407 nm to give 607 nm red emission. In the system of Sr In_2O_4∶ Eu^(3+),Sm^(3+),the energy transfer between Sm^(3+)and Eu^(3+)were discovered and investigated. The energy transfer leads the sample SrIn_2O_4∶ Eu^(3+),Sm^(3+)to be more suitable for the 390-410 nm UV LED.