Gd_(1-x)Eu_xAl_3(BO_3)_4纳米晶的合成及其发光性能

Synthesis and Luminescence of Nano-microcrystal of Gd_(1-x)Eu_xAl(BO_3)_4

以高温固相反应法合成了Gd1-xEuxAl3(BO3)4∶Eu3+纳米荧光粉。使用XRD分析确定了样品的物相,并根据谢乐公式计算出其微晶的纳米粒度。采用了“粉末悬浮法”以甘油为分散介质,在RF540荧光光度计上测试了纳米晶荧光粉的激发光谱和发射光谱。GdAl3(BO3)4基质本身发光,GdAl3(BO3)4∶Eu纳米荧光粉表现了Eu3+的特征发射光谱,其中最强峰为5D0→7F2发射,表明晶体结构中没有对称中心格位。实验表明在GdAl3(BO3)4∶Eu纳米晶荧光粉中,存在Gd3+对Eu3+发光的基质敏化作用。

REAl3 （BO3 ）4 was well known as good laser materials, but its fluorescent nano-powders have not been well studied. A series of fluorescent nano-powders Gd1-xEuxAl3 （BO3 ）4 has been synthesized by solid reactions. Raw materials Al2O3 ,H3BO3 ,Gd203 ,Eu2O3 were well mixed and baked at 400 ℃/2 h first,then 750 ℃/4 h, and 1 150 ℃/8 h the last. After being well grinded the fluorescent powders of Gd1-xEuxAl3（ BO3 ）4 has been synthesized . The samples were characterized by XRD, and the microcrystal diameter of the samples were calculated to be within 100 nanometer by XRD diagram. Their luminescent properties of the fluorescent powders were measured by the RF540 fluorescence spectrometer （Japan） with ＂suspending powder method＂ with glycerin as the dispersing medium. The samples of GdAl3 （BO3 ）4 gave the emission spectrum at 310 nm when excited by the light of 280 nm, and the spectrum of dispersing medium glycerin did not disturb the spectrum of GdAl3 （BO3）4. The samples of Gd1-xEuxAl3 （BO3 ）4 almost had the same emission spectrum of Eu^3＋ no matter they were excited by 390 nm or by 280 nm. The strongest emission of Eu^3＋ was ^5D0→^7F2 transition. So there was no symmetry position in the crystal structure of Gd1-xEu,Al3 （ BO3 ）4 by the rule of fluorescent probe. The emission spectrum of ^5D0→^7F2 was higher excited by 280 nm than that excited by 390 nm. It was the evidence of the energy transfer between Gd^3 ＋ - Eu^3 ＋. The experiment results show that fluorescent powders with nanometer micmcrystals of Gd1-xEuxAl3 （ BO3 ）4 can be synthesized by solid reactions. GdAl3 （ BO3 ）4： Eu^3＋ gives 618 nm emission spectrum as the transition ^5D0→^7F2 ,and there was no symmetry position in the crystal structure of Gd1-xEuxAl3（ BO3 ）4. The experiment results show that there was energy transfer between Gd^3＋ - Eu^3＋. Because of its fine properties of fluorescence and its stability of material, the fluorescent nanopowders of Gd1-xEuxAl3 （BO3）4 may possess great value for being further studied and used.