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    La3+/Eu3+掺杂对KAlSi2O6基红色荧光粉发光性能的影响

    Effect of La3+ and Eu3+ Doping on the Luminescence Performance of KAlSi2O6 Based Red Phosphor

    • 摘要: 采用高温固相法制备了K1-xAlSi2O6xEu3+x=0.01,0.03,0.05,0.07,0.09,0.11,物质的量分数,下同)和K0.93-xAlSi2O6∶(0.07Eu3++xLa3+)红色荧光粉,研究了La3+/Eu3+掺杂对发光强度、荧光寿命、色坐标的影响规律。结果表明:Eu3+掺杂和Eu3++La3+掺杂KAlSi2O6基红色荧光粉物相均为白榴石相,未出现新相;随着Eu3+掺杂量的增大,KAlSi2O6红色荧光粉的白榴石相由四方结构向立方结构转变。随着Eu3+掺杂量的增大,KAlSi2O6红色荧光粉的发光强度先增后减,当掺杂Eu3+的物质的量分数为0.07时强度最大;随着La3+掺杂量的增加,K0.93AlSi2O6∶0.07Eu3+荧光粉的发光强度先增后减,当La3+掺杂物质的量分数为0.09时强度最大,为单掺杂物质的量分数0.07 Eu3+时的2倍以上。同时掺杂物质的量分数0.07Eu3+和0.09 La3+的KAlSi2O6基红色荧光粉的荧光寿命比单掺杂物质的量分数为0.07 Eu3+时更长,色坐标由单掺杂Eu3+时的橙色向红色移动,红色成分更明显。La3+的掺杂能显著提高该荧光粉的发光性能,并在合适的掺杂量下表现出优异的红光发射性能。

       

      Abstract: Red phosphors K1-xAlSi2O6xEu3+ (x=0.01, 0.03, 0.05, 0.07, 0.09, 0.11, the same as below) and K0.93-xAlSi2O6∶(0.07Eu3++xLa3+)were prepared by high temperature solid-state method. The effects of La3+/Eu3+ doping on luminescence intensity, fluorescence lifetime and color coordinate were studied. The results show that both Eu3+ doped and Eu3++La3+ doped KAlSi2O6 red phosphors were leucite phase, and no new phase was found. With the increase of Eu3+ doping, the leucite phase of KAlSi2O6 red phosphor changed from tetragonal structure to cubic structure. With the increase of Eu3+ doping, the luminous intensity of KAlSi2O6 red phosphor increased first and then decreased, and the intensity was the highest when the mole fraction of Eu3+ was 0.07. With the increase of La3+ doping, the luminous intensity of K0.93AlSi2O6∶0.07Eu3+ red phosphor increased first and then decreased. When the mole fractiont of La3+ was 0.09, the intensity was the highest, which was more than twice as much as that of Eu3+ with single doping mole fraction of 0.07. Compared with the single doping mole fraction of 0.07Eu3+, the fluorescence lifetime of KAlSi2O6 based red phosphors both doped with 0.07Eu3+ and 0.09La3+ was longer, and the color coordinate moved from orange to red, and the red component was more obvious. The doping of La3+ could significantly improve the luminescence performance of the phosphor, and showed excellent red emission performance under appropriate doping amount.

       

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