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

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。

Improvement Up-conversion Luminescence Properties of SrIn_2O_04:Er^(3+) by Doping Yb^(3+) as Sensitizer

A series of Yb^(3+)/Er^(3+) or Er^(3+) doped SrIn_2O_4 were synthesized by a high temperature solid state method.The up-conversion luminescence property and the phase formation of SrIn_2O_4:Er^(3+) and SrIn_2O_4:Yb^(3+),Er^(3+) were investigated by X-ray diffraction(XRD) and spectral methods.The XRD pattern shows that incorporating different amounts of Yb^(3+)and Er^(3+) have no influence on the phase formation of SrIn_2O_4.The up-conversion luminescence spectrum of SrIn_2O_4:Er^(3+) presented a weak luminescence due to ground state absorption of Er^(3+).However,Yb^(3+)/Er^(3+) codoped SrIn_2O_4 depicted the green(525 and 551 run) and red(662 nm) up-conversion luminescence which were assigned to the energy transfer from the Yb^(3+) transition ~2F_(7/2)-~2F_(5/2) to the Er^(3+) transitions ~2H_(11/2)-~4I_(15/2) and ~4F_(9/2-~4I_(15/2),respectively.The possible up-conversion luminescence mechanism of SrIn_2O_4:Yb^(3+),Er^(3+) was analyzed.All results could be helpful to the development of up-conversion luminescence materials.