Yb3+,Er3+双掺上转换玻璃陶瓷

制备了以PbF₂+GeO₂+WO₃SiO₂+NaF为基质组分的Yb³⁺,Er³⁺双掺稀土离子上转换发光玻璃陶瓷。采用日本产Hitachi F-4500荧光光度计,激发波长为980nm,观测到样品在550nm处出现较强的上转换发光峰,在528nm处有一个次发光峰,在650nm处有一个相对较弱的发光峰,讨论了发射光谱的特征,建立上转换发光机制,并讨论了上转换发光特征,以及基质成分、制备工艺参数、稀土离子浓度对发光性能的影响。实验中发现c(Yb³⁺):c(Er³⁺)为5:1时,上转换玻璃陶瓷的熔融温度为950℃、退火温度为380℃时,其上转换发光效率最高。

Up-conversion Luminescence of Glass Ceramics Co-doped with Yb3+,Er3+

Solid-state blue and green light sources have many important uses.For example they are desirable for high-density optical storage,color displays,optoelectronics and medical diagnostics.Up to now,the conversion from infrared into visible wavelength has attracted much attention and up-conversion material doped with rare earth ions has been intensively studied on various crystals and glasses.Most oxide glasses are much more chemically and mechanically stable and also are more easily fabricated into various shapes,but their larger phonon energy results in the high inefficient rate of infrared up-conversion.As known to all,fluoride material has lower phonon energy,which is very useful for improving the up-conversion efficiency,whereas due to poor chemical stability,disappointing mechanical strength and low laser damage threshold,all these problems limit its development and application.Nowadays,people are trying preparing up-conversion luminescence material of oxy-fluoride.This type of material possesses both the high up-conversion luminescence efficiency of fluoride material and characters of oxide materials.In this paper,the preparation of glass ceramics doped with Yb³⁺,Er³⁺ in composition of PbF₂+GeO₂+WO₃+SiO₂+NaF and the effect of the rare-earth ions on the host material are reported.The emission spectrum was measured under a 980nm laser diode excitation.It shows a strong up-conversion emission peak at 550nm and weak peaks at 528nm and 650nm.The experimental results were discussed and the up-conversion mechanism was established.The spectroscopic properties,the composition of host glass,the preparation parameter,the concentration of rare-earth ion,the dependence of emission intensity on the excitaion power were also discussed.In our experiment we select PbF₂,GeO₂,WO₃,SiO₂ and NaF as host constituents.Pb³⁺ and W⁶⁺ both have larger masses; moreover the mass of F^- is bigger than that of O^2-.So the host glass bears good transmittance in the near infrared region.Because of smaller bond strength of Ge-O,GeO₂ hardly absorbs near infrared light.Heavy metal fluorides with low phonon energy easily produce transfer course of free radiation.GeO₂ and SiO₂ are both glass formers among the components and useful to generate glass in network structures.Through many experiments we set the annealing temperature at 380℃ and the melting temperature at 950℃.The optimum proportion is of c(Yb³⁺):c(Er³⁺)= 5:1.