Abstract:
Co
3+-doped LaBO
3 powders were synthesized by combustion method using La(NO
3)
3·6H
2O, Co(NO
3)
3·6H
2O), H
3BO
3, and C
2H
5NO
2 as the raw materials with the mole ratio of La(NO
3)
3·6H
2O+Co(NO
3)
3·6H
2O:H
3BO
3:C
2H
5NO
2=3:3:5. The synthesis process and crystal morphology of the target products La
(1−x)Co
xBO
3 (
x=0.01~0.04) at 750~950 ℃ were studied. The influence of synthesis conditions on the crystal morphology of the powder products was analyzed. The optimal ratio of the raw materials, reaction temperature, reaction time, and doping dosage were obtained. In the results, the combustion synthesis method can be used to prepare the Co
3+-doped LaBO
3 powders, and the experimental conditions are simple, the calcination temperature is low, the yield is high, and it is easy to industrialization. The optimal reaction condition is 900 ℃ and 4 h, the doping dosage of cobalt as modifier is
x=0.03, and the products are La
0.97Co
0.03BO
3 powders. Under the optimal reaction condition, the products are the short rod-like powders in the uniform particle size distribution with the diameter of 115~185 nm and the length of 400~600 nm. The fluorescence excitation band appears at 330~440 nm for the Co
3+-doped LaBO
3 powders, indicating that the Co
3+-doped LaBO
3 powders with the uniform particle size and crystal morphology can be used as the substrate material for preparing the luminescent powders.