Study On Preparation And Properties Of Phosphate Luminescent Glasses And Glass-ceramics

Phosphate glass and glass ceramics have been prepared by conventional melt casting and heat-treated crystallization method. The influence of glass composition on the glass forming ability and luminescence properties of Rare earth doped SZPK glass as well as the effects of heat treatment temperature and doping ions on the properties of the glass ceramics have been investigated by DSC,SEM,XRD and Fluorescence spectrometer. The obtained conclusion is as follows:1. The effect of glass composition on the glass-forming ability of Sr O-Zn O-P2O5(SZP) glass system was investigated. Adding appropriate amount of oxide such as K2 O, Al2O3, B2O3 and Sb2O3 can effectively improve the stability and glass forming ability of the glasses. Here, the addition of K2 O is the most effective to mprove glass-forming ability When K2 O = 2% mol, the stability parameters ΔT and H ’, are 107 and 0.2198, respectively, which is larger than that of the original base glass(ΔT = 93 and H ’= 0.1876).2. The luminescence properties of rare earth ions doped Sr O-Zn O-P2O5-K2O(SZPK) system glasses were systemically studied. The spectral characteristics and color of the single rare earth ion(Tm3+、Tb3+、Sm3+、Eu3+、Mn2+ and Dy3+) doped-SZPK glass were clarified. Under the near ultraviolet excitation, the Tm3+ doped glass sample shows the blue light emission, the Tb3+ doped glass sample presents the green light emission, and Sm3+, Eu3+, Mn2+ doped glass sample manifests the red light emission, the Dy3+ doped glass sample demonstrates white light emission. The color coordinates of the Tb3+/Eu3+ and Tb3+/Sm3+ co-doped glass samples are(0.360, 0.360) and(0.335, 0.327) respectively, which is close to standard white light color coordinates(0.333, 0.333) at the near ultraviolet excitation.3. The spectral chanacteristics of the tri-doped glass samples excited by near ultraviolet light were studied. As for Tm3+/Tb3+/Eu3+ doped glass specimen, the emitting light color gradually shifts from white light region to green light region with an increase of Tb3+ comcentration. As for Tm3+/ Tb3+/ Mn2+ doped glass sample, the emitting light color gradually shifts from green light region to white light region with an increase of Mn2+ comcentration. Fluorescence decay curve and life calculation results show that the energy conversion of Tm3+ and Tb3+ to Mn2+ occurs. However, concentration quenching happens as Mn2+ >2% mol.4. The luminescence properties of multi-ions doped glass-ceramic samples were studied. Meanwhile, the effects of heat treatment temperature on the luminous intensity were also discussed. The results show that both the amounts of uniform distribution grains and luminous intensity are increased with the increase of heat treatment temperature. The main phase precipitated in the glass matrix is Sr Zn P2O7. In addition, the spectral characteristics of the Ce3+/Tb3+/Mn2+ doped glass-ceramics were investigated. The results show that the light color moves from cold white light region to warm white region with the increase of Mn2+ content in the Ce/Tb/Mn doped glass-ceramics.