GdAlO_3∶Eu^(3＋)荧光粉的合成及发光特性研究

Synthesis and luminescence properties of GdAlO_3∶Eu^(3+)

研究了不同退火机制下GdAlO3∶Eu3+荧光粉的光谱特性。采用高温固相反应法在空气气氛和还原气氛中分别合成了GdAlO3∶Eu3+荧光粉,讨论了在烧结过程中产生的色心的光谱性质及其对GdAlO3∶Eu3+发光强度、激发光谱和O2--Eu3+电荷迁移带位置的影响。研究了后退火对GdAlO3∶Eu3+光谱特性的影响,进一步解释了VUV激发下的能量传递机制。根据烧结气氛、烧结温度和后退火对色心以及GdAlO3∶Eu3+光谱特性的影响,找到了一条能有效消除色心获得高荧光强度的两步反应合成路线。

The GdAlO3： Eu3＋ phosphor was synthesized by high temperature solid state reaction in air and in reduction atmosphere. The influences of color centers on the red fluorescence intensity, decay time, excitation spectra and position of O2-Eua＋ charge transfer band （CTB） are studied. After annealing, the intensity of GdAlO3： Eu3＋ is enhanced greatly, and the osition of O2 -Eua＋ CTB was recovered. Based the effects of sintered temperature and atmosphere on color centers, a two step synthesis route is proposed to effectively eliminate color centers and obtain high fluorescence intensity.