Up-conversion emissions of Er3 -Yb3 codoped Al2O3 nanoparticles by the arc discharge synthesis method

作者：Dong Bin^*; Cao BaoSheng; Feng ZhiQing; Wang XingJun; Li ChengRen; Hua RuiNian

来源：Science in China - Series G: Physics Mechanics and Astronomy , 2009, 52(7): 1043-1046.

DOI：10.1007/s11433-009-0132-z

• up-conversion
• Er3 -Yb3 codoped Al2O3
• arc discharge synthesis

The Er3 -Yb3 codoped Al2O3 nanoparticles with an average particle size of about 50 nm have been synthesized by an arc discharge synthesis method. The green and red up-conversion emissions centered at about 526, 547 and 677 nm, corresponding respectively to the H-2(11/2)-> I-4(15/2), S-4(3/2)-> I-4(15/2) and F-4(9/2)-> I-4(15/2) transitions of Er3 , were detected by a 978-nm semiconductor laser diode excitation. The Annealing has evident effect on the up-conversion emissions of the samples: The red up-conversion emission is noticeable before annealing; however, the green up-conversion emission becomes predominant after annealing. The mixture of (Er,Yb)(3)Al5O12 and alpha-(Al,Er,Yb)(2)O-3 phases is more favorable for green up-conversion emissions due to an enhancement of the ESA (I) of I-4(11/2) a photon -> F-4(7/2) and ET (III) of F-2(5/2)(Yb3 ) I-4(11/2)(Er3 )-> F-2(7/2)(Yb3 ) F-4(7/2)(Er3 ) processes. The two-photon absorption up-conversion process is involved in the green and red up-conversion emissions. The results have proved that arc discharge synthesis is a new promising preparation technology for optical materials.

• 出版日期2009-7
• 单位北京大学; 大连民族大学; 辽宁师范大学