We have developed two methods that are able to synthesized SiO2
core-Zn2SiO4:Mn shell phosphor successfully either in powder or assembled PBG structure. XRD result shows that Zn2SiO4 is formed as the annealing temperature higher than 800oC. 1100oC heat treatment is the best annealing temperature, which performs strongest PL property. 5 mol% of Mn doping corresponding to concentration quenching effect shows the best PL properties.
The precipitation behaviors of Zn and Mn under the variation of pH value are also concerned for ZSpII (powder coating case). Co-precipitation of Zn/Mn on SiO2 shows a better chemical uniformity than that of solid state reaction, therefore, performs a stronger PL intensity.
For the original experimental design, ZnO (with IEP ~ 9) is expected to be attracted by SiO2 (with IEP ~ 3) surface as the pH value of system controlled at 8.5.
However, according to the calculation of solubility for Zn2+ (and also Mn2+), Zn2+ and Mn2+ does not co-precipitate at the setting pH value (8.5) and therefore there’s always a difference existing between the design value (i.e. 0.16/5 mol%) for Zn/Mn and the prepared one (i.e. 0.14/4.5 mol%).
added results in a lower PL intensity, while the diluting step in ZSpVI (PBG coating case) case is necessary to maintain a good coating condition. For the performance of PL property, 5 mol% Mn doping, 1000oC heat treatment for 2 hr and also dilute to 3 times by alcohol lead to a best PL emission.
In addition, these Zn2SiO4:Mn phosphor is able to operated by applied voltage (at the threshold voltage of 175 V) as a luminescence device and thus performs visible light as a CL emission.
In this study, the submicron size SiO2 core-Zn2SiO4:Mn shell spherical particles are synthesized successfully which perform a green light (520 nm) PL emission. Via ZSpVI method, the Zn2SiO4:Mn is able to be coated on assembled silica template and thus become a phosphor PBG crystal.
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