Preparation And Properties Of Infrared Luminescent Composite Glass

Since the invention of the first ruby(Cr³⁺:Al₂O₃)crystal laser in the 1960s,laser science and technology has begun to develop rapidly,which has penetrated into various basic and applied research fields.The past decades have witnessed the substantial progress in development of various laser materials.Especially,the infrared laser materials in the 1?3?m waveband have attracted great attentions,because of the fundamental applications in various fields such as molecular spectroscopy,atmospheric remote sensing,clinical diagnosis,photoelectric countermeasures and so on.As a typical example,Cr²⁺/Zn Se crystal is recognized as the“mid-infrared titanium sapphire”because it exhibtis an ultra-broadband absorption and emission cross section,and almost no excited state absorption at room temperature.However,Zn Se matrix is difficult to be fabricated into fiber waveguide.At present,the composite system composed of glass and crystal has become a new candidate for infrared laser materials and it can potentially combine both advantages of crystal and glass.The purpose of this thesis is to fabricate infrared luminescent composite glass,including the fabrication of Er³⁺-Yb³⁺/Zr O₂ and Cr²⁺/Zn Se powders,characterization of their optical properties,and construction of infrared active composite glass.The main contents include:1.The Cr²⁺/Zn Se powder has been prepared by a high-temperature solid-phase method.The crystalline phase can be indexed to cubic and the average particle size is estimated to be?3?m.Under the excitation of 532 nm laser,the infrared broadband luminescence at the 1600?2800nm can be observed and it is originated from ⁵E?⁵T₂ of Cr²⁺.The effects of preparation conditions on the luminescence performance have been studied and the optimal experimental conditions is 5%argon-hydrogen atmosphere with the calcination temperature of 1100 ^oC for180 min.The doping concentration dependent luminescence has been studied and the optimal doping concentration is determined to be 1.5 mol%Cr²⁺.2.Glass composite has been studied by using the tellurite and boron phosphate glass as the host glass.Three typical tellurite glass system with the composition of?mol%?78Te O₂-17Zn O-5Bi₂O₃?TB?,?mol%?75Te O₂-20Zn O-5Na₂O?TN?and?mol%?85Te O₂-10Ti O₂-5La₂O₃?TL?have been studied.With the addition of Cr²⁺/Zn Se powder,the samples are devitrified and become black in color.Only weak infrared luminescence can be observed in the composite TL glass embedded with?wt%?3Cr²⁺/Zn Se.The results indicate that the employed tellurite glass is not suitable as a host glass.Furthermore,boron phosphate glass with the composition of?mol%?33.33Na₂O-40P₂O₅-26.67B₂O₃ is selected as the matrix glass.The homogenous composite glass embedded with?wt%?3Cr²⁺/Zn Se can be fabricated by the secondary melting method.Raman test shows that the Zn Se crystalline phase can be detected in the composite glass.Broadband infrared luminescence in the waveband region of 1600?2800 nm can be observed.3.The Er³⁺-Yb³⁺codoped Y-stabilized Zr O₂?YSZ?precursor has been prepared by a two- step direct precipitation-hydrothermal method.The size of the samples can be tuned from nano to micro-scale by control of the heat-treatment temperature.After heat-treatment at 800?1350^oC for 15 min,the crystallinity and crystal size gradually increase as the heat-treatment temperature increase.YSZ powder sample codoped with 1%Er³⁺/1.5%Yb³⁺show up-conversion and near-mid-infrared luminescence.The relative intensity of green and red emission band exhibits strong heat-treatment dependence.This optical phenomenon implies its potential application for thermal history sensor.After further heat-treatment?1600 ^oC,5 h?,the infrared luminescence in the 1400?1800 nm and 2550?2850 nm wavebands can be observed.