Abstract
Transparent bulk glass ceramics of 4. 5ZnO-5. 5Al2O3-90 SiO 2( ZAS) and single doped ZAS ∶ RE3 +( RE = Eu,Tb,Ce) were synthesized by sol-gel method. X-ray diffraction( XRD),transmission electron microscopy( TEM) and photoluminescence( PL) spectra were employed to study the influence of doping rare-earth ions concentration on the structure and luminescence properties of ZAS glass-ceramics. XRD results show that ZAS∶ RE3 +( RE =Eu,Tb,Ce) glass ceramics heat-treated at 900 ℃ consist of ZnA l2O4 phase with average grain size of 30 nm and amorphous SiO 2. TEM results show that ZnA l2O4 were precipitated from ZAS system when heat-treated at 900 ℃,and doping ions have not changed the original structure. PL spectra indicate that ZAS ∶ Eu3 +emits intense 611 nm red light originating from5D0→7F2transition of Eu3 +ions,ZAS ∶ Tb3 +shows 541 nm green emission attributed to5D4→7F5transition of Tb3 +ions,and ZAS∶ Ce3 +gives 381 nm blue light corresponding to the 5d to 4f transition of Ce3 +ions. Furthermore,the concentration quenching phenomena are observed while the single doping mole fraction of Eu3 +,Tb3 +and Ce3 +was 20%,20% and 3%,respectively. The excellent Commission International de I'Eclairage( CIE) chromaticity coordinates of ZAS∶ RE3 +( RE = Eu,Tb,Ce) glass-ceramics indicate that they are good candidates for the application of white LEDs.
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