Near-and Mid-infrared Broadband Photoluminescence And White Upconvertion Of SiO₂-PbF₂-glass

The application of glass luminescent materials has penetrated into all areas of people’s lives,in particular,its application research in optical fiber communication,medical detection,solid-state lasers and other fields has always been a hot topic and focus of scientific research.Rare-earth-doped luminescent glass has been used in solid-state laser and fiber amplification since the middle of the last century.However,in the conventional solid-state lasers and fiber amplifiers,the rare-earth-doped luminescent glass has a narrow,single and discontinuous light emission band,it makes the laser only applicable to the output of a fixed band,limit its application in the field of optical communications.This requires the preparation of broadband tunable laser glass materials.In this paper,rare-earth ions Nd3+,Ho3+,Er3+ Tm3+,and Yb3+ are doped in the SiO2-PbF2 glass,mid-infrared emission and near-infrared broad-band luminous glass were prepared,broadens the near-infrared emission spectrum.At the same time,it made up for the lack of the band.In addition,up-converting white light is widely used in solid-state color three-dimensional display and white LED light sources,in addition to the rare-earth ion-doped SiO2-PbF2 glass capable of achieving near-infrared emission,it is also possible to achieve up-conversion by reasonable doping.The main research content of this paper is as follows:(1)Different kinds of SiO2-PbF2 glasses doped with rare earth ions were prepared,The glass forming properties of SiO2-PbF2 glass were analyzed based on DSC curves.Excited by a 980 nm laser,The near-infrared emission characteristics of Yb3+/Tm3+,Yb3+/Ho3+ and Yb3+/Er3+ co-doped glass systems were systematically analyzed.Calculated by Judd-Ofeld theory,the absorption/emission cross sections of Tm3+,Ho3+ and Er3+ at 1800 nm,2000 nm and 2850 nm,1530 nm and 2720 nm were reached to 0.5044×10-20 cm2/0.3355×10-20 cm2,0.5067×10-20 cm2/0.6327×10-20 cm2 and 0.4650×10-20 cm2/0.4392×10-20 cm2,and 0.5832×10-20 cm2/0.7149×10-20 cm2 and 1.3274x10-20 cm2/1.1670×10-20 cm2.This shows that we can produce such glass materials as near-infrared laser and amplification materials.(2)Introducing a variety of rare earth ions into SiO2-PbF2 glass,especially with the luminescence of Nd3+ at 1350 nm,the near-and mid-infrared 1200 nm-2100 nm wide-band coverage was achieved at the same time when the 980 nm and 808 nm lasers were combined to form a dual light source system.To reduce luminescence quenching during multi-doping on a single glass,multi-doped double-layer glasses were prepared.Under the simultaneous excitation of 980 nn and 808 nm lasers,near-infrared 1200 nm-2100 nm broadband coverage is achieved,which also provides the basis for the modulation of luminous intensity.(3)Visible light-emitting SiO2-PbF2 silicate glasses co-doped with Yb3+,Tm3+,Er3+,and Ho3+ rare earth ions were prepared.The perforance of glasses is tested by changing the rare earth ion doping concentration and laser excitation power.It found that the color temperature of the white light emission of the system can be effectively controlled around the white light region.The luminescence achieves near-continuous tunable characteristics from the yellow region through the white region to the blue region as the laser power changed.