Preparation And Visible Light Emission Properties Of(Sm³⁺,Tb³⁺,Eu³⁺)-Dy³⁺ Co-Doped Aluminate Glass

Fiber laser has the advantages of small size,compact structure and high efficiency,and is widely used in biomedical,military,sensing and basic research fields.The traditional visible light fiber laser is mainly pumped by semiconductor laser,and the output of visible light laser is realized by stimulated emission of rare earth ions in gain fiber.At present,praseodymium ion(Pr³⁺)is the main active ion commonly used for visible laser output.However,Pr³⁺is mainly used for red laser output,and its efficiency is low in ultraviolet,blue,green,yellow and deep red bands.For green and yellow light bands,this paper uses ions with strong absorption in blue light band as sensitizer ions to improve the absorption efficiency of Dy³⁺and Tb³⁺ions in blue light region in the form of energy transfer,so as to realize efficient yellow-green light emission.Because the low phonon energy matrix glass material is beneficial to reduce the non-radiation transition probability of rare earth ions and improve their emission intensity,this paper chooses aluminate glass with low phonon energy.The experimental contents are as follows:（1）Sm³⁺and Dy³⁺doped aluminate glasses have different concentrations of Sm³⁺ions（0.5～3.0 mol%）by fixing the concentration of Dy₂O₃（1 mol%）,in which the introduction of Sm³⁺ions can enhance the absorption in the blue region,and there is an energy transfer relationship between Sm³⁺and Dy³⁺ions,from Sm³⁺to Dy³⁺.Moreover,by introducing Sm³⁺ions,the emission of Dy³⁺ions in the yellow region can be increased,and the emission intensity at 578 nm is increased by 10.8 times under the excitation of 469 nm.（2）In the aluminate glass doped with Tb³⁺and Dy³⁺,the optimum ratio of Tb³⁺and Dy³⁺was found by changing the concentration of Tb₄O₇ and Dy₂O₃.Under this ratio,it was found that Dy³⁺could effectively sensitize Tb³⁺,thus enhancing the emission of TB³⁺in the green region.The introduction of Dy³⁺ion makes the absorption cut-off edge of the glass matrix red-shifted,and when 0.5 mol%dysprosium oxide is mixed with 1.0 mol%Tb₄O₇,stronger green emission can be obtained.Compared with aluminate glass doped with Dy³⁺ion,its emission intensity is increased by 47 times under the excitation of 451 nm,which is due to the fact that Dy³⁺can transfer some energy to Tb³⁺.（3）Eu³⁺and Dy³⁺doped aluminate glass,the Eu³⁺and Dy³⁺ions are mixed by orthogonal experiment,and it is found that Eu³⁺ions can improve the absorption of glass in blue light region and the emission of Dy³⁺ions in yellow light region through energy transfer,and the excited intensity in blue light region is obtained when the Eu³⁺ions are doped with 1 mol%dysprosium oxide and 1 mol%Eu₂O₃.