燃烧法合成光谱可调SrMgAl_(10)O_(17):Eu^(2+),Mn^(2+)荧光粉及发光性能

Photoluminescence Properties of Combustion Synthesized Color-tunable SrMgAl_(10)O_(17):Eu^(2+), Mn^(2+) Phosphors for Ultraviolet Light-Emitting Diodes

采用低温燃烧法在600℃的马沸炉中制备了发光光谱可调的SrMgAl_(10)O_(17)∶Eu^(2+),Mn^(2+)荧光粉,并用X射线衍射仪(XRD)、扫描电子显微镜(SEM)以及荧光光谱仪(PL)等测试手段对所制备荧光粉的晶体结构、形貌和发光性质进行了表征。XRD和SEM测试结果表明:通过低温燃烧法合成的SrMgAl_(10)O_(17)∶Eu^(2+),Mn^(2+)荧光粉晶相单一,结晶度高; PL测试结果表明:紫外LED芯片可以有效地激发SrMgAl_(10)O_(17)∶Eu^(2+), Mn^(2+)荧光粉,其发射光谱中观测到两个发射峰,分别位于460 nm和513 nm。当改变荧光粉中Eu^(2+)和Mn^(2+)的掺杂比时,荧光粉的发射光谱由蓝色转变为蓝绿色最终转变为绿色。通过计算掺杂荧光粉的能量传递效率和临界距离,我们得出SrMgAl_(10)O_(17)∶Eu^(2+), Mn^(2+)荧光粉的能量传递机制是电偶极-电四极相互作用的。本文制备的SrMgAl_(10)O_(17)∶Eu^(2+), Mn^(2+)可用于近紫外LED芯片激发的光谱可调白光LED用荧光粉。

Eu2+,Mn2+ions co-doped SrMgAl10O17 color-tunable phosphor was synthesized by utilizing combustion method at 600℃.The crystal structure and luminescent properties of samples were analyzed by the X-ray diffraction(XRD),scanning electron microscope(SEM)and photoluminescence(PL)spectrum,respectively.The XRD and SEM analysis indicated that SrMgAl10O17∶Eu2+,Mn2+is formed as a pure single-phase.The PL results showed that the phosphor as synthesized can be effective excited by near-UV LED chips with two broad emission bands centered at 460 and 513nm,respectively.The emission color of the phosphors can be tuned from blue to cyan and finally to green by adjusting the concentration ratios of Eu2+and Mn2+ions.The effective energy transfer efficiency and critical distance were calculated,which demonstrated that the energy transfer mechanism is due to the electric dipole-quadruple interaction.Our results indicated that SrMgAl10O17∶Eu2+,Mn2+is a kind of promising color-tunable phosphors for white LEDs with near-UV LED chips.