Ho < Sup > 3 + < / Sup > / Tm < Sup > 3 + < / Sup > / Yb < Sup > 3 + < / Sup > Plasma Doping Fluoride Oxide Glass And Fluorescence Properties Of Silicate Glass

Over the past two decades, the rare earth fluorescent material has received a greatamount of attention due to its potential applications in solid laser, sensors, solar cell, lightstorage device,3-dimensional display and so on. At present, special attention has beengiven to rare earth ions co-doped matrix materials owing to their unique properties forfuture photonics device. In this thesis, we systematically studied the spectrum propertiesand up-conversion luminescent mechanism of NaYF₄glass ceramics dopingHo³⁺/Yb³⁺-Tm³⁺/Yb³⁺-Ho³⁺/Tm³⁺/Yb³⁺and the up-conversion fluorescence properties ofHo³⁺/Yb³⁺co-doped silicate, achieved white-light. The rest and contents of the thesis isorganized as follows:In the first section, the Ho³⁺/Yb³⁺-Tm³⁺/Yb³⁺-Ho³⁺/Tm³⁺/Yb³⁺co-doped NaYF₄glassceramic and Ho³⁺/Yb³⁺doping silicate glass ceramics were fabricated usinghigh-temperature melting method. The existence of nanocrystal within glass sample wasconfirmed by X-ray Diffraction （XRD）. Under the980nm infrared light pumping, thefluorescence spectra of the rare earth ions Ho³⁺, Tm³⁺were characterized. The results showthat the green-light emission peak within520⁵80nm has obvious Stark fracturing and isoriginated from Ho³⁺（⁵F₄/⁵S₂â†'⁵I₈） radiation. The red-light emission within626⁶80nm isoriginated from Ho³⁺（⁵F₅â†'⁵I₈） radiation. The blue-ray was due to Tm³⁺ion （¹G₄â†'³H₆）with the light center475nm, the red-ray in part by Tm³⁺ion （¹G₄â†'³H₄） with the lightcenter651nm, the infrared-ray was from Tm³⁺（³H₄â†'³H₆） with the light center790nm.The up-conversion mechanism of NaYF₄glass ceramics is explained through the ln-lnrelations between fluorescence spectra intensity and pump power and rare earth ionsenergy level. The results show that the main conversion fluorescent blue-ray is three-photon process, while the green, red and infrared-ray conversion fluorescence is mainlytwo-photon process. White-light emission was finally achieved by changing the parameterssuch as rare earth ions concentration and pump power. In the second section, the Ho³⁺/Yb³⁺co-doped silicate glass ceramics was fabricated and characterized. The experimental resultsof fluorescence spectrum demonstrate the fluorescence enhancement effect of Li⁺ion onrare earth ions Ho³⁺. In the last section, we calculated the J-O strength parameters λHo3+in NaYF₄glassceramic using the Judd-Oflet. The experimental improved fluorescent guantum effect ofYb3+and Li⁺is explained theoretically.