Study On Crystallization Regulation And Luminescence Enhancement Mechanism Of Associated Dual-Phase Glass-Ceramics

Dual-phase glass-ceramics,providing several crystal sites,are of great significance in modulating the coordinated environments of doped ions and obtaining multi-wavelength and ultra-broadband luminescence.In the research of traditional rare earth and transition metal ion doped dual-phase glass-ceramics,the precipitation of the two crystals were independent,the crystal spacing was far away,the energy transfer process between rare earth and transition metal ions was cut off,and the luminous efficiency was reduced.In order to solve these problems,this paper aims to propose a new associated crystallization strategy for the fabrication of new dual-phase glass-ceramics with controllable crystal distribution and enhance the luminous efficiency of dual-phase glass-ceramics.The research contents and results of this work are listed as follows:1)Firstly,a matrix glass with phase-separated network structure was designed for the fabrication of rare earth ions and transition metal ions co-doped dual-phase glass-ceramics.Due to the good limiting effect of fluoride networks in the phase-separated glass on rare earth(Yb³⁺)and transition metal(Mn²⁺)ions,the upconversion luminescence of Yb³⁺and Mn²⁺could be realized at room temperature.Furthermore,KZn F₃ and KYb₃F₁₀ nanocrystals were precipitated from glass via the heat treatments of glass,the upconversion luminescence of Yb³⁺and Mn²⁺was further enhanced,and the composite luminescence of the glass was adjusted from yellow to white and then to blue.2)The regulation mechanism for crystallization and luminescence enhancement mechanism of the dual-phase glass ceramics were deeply studied based on the 60Si-40F glass to propose a novel associated crystallization engineering strategy.Under the induction of Yb³⁺,KZn F₃ and KYb₃F₁₀ nanocrystals precipitated connectedly,and the luminescence intensity was enhanced by more than 100 times compared with Ni²⁺single-doped glass-ceramics.Besides,the optical applications of these dual-phase glass-ceramics featuring high-efficiency ultra-broadband luminescence were also demonstrated.The identification and concentration detection of various organic compounds were realized by using the efficient dual-phase glass-ceramic as gain materials.