## 3 Results
### Gloss and Luminescent Properties of Security Pigment Films  
We measured the gloss characteristics of the films, which contain MF, TMF, Y\({}_{2}\)O\({}_{3}\):Eu@MF and Y\({}_{2}\)O\({}_{3}\):Eu@TMF pigments, mixed with epoxy resin to observe their correlation with luminescent properties. Table 2 shows the gloss characteristics of Y\({}_{2}\)O\({}_{3}\):Eu@MF and Y\({}_{2}\)O\({}_{3}\):Eu@TMF. The gloss characteristics of TMF were higher at each angle than MF alone, which is believed to have a greater effect on TiO\({}_{2}\). In addition, as the coating coverage of Y\({}_{2}\)O\({}_{3}\):Eu\({}^{3+}\) increases, the gloss characteristic decreases, which is thought to be the effect of Y\({}_{2}\)O\({}_{3}\):Eu\({}^{3+}\), which has a weak gloss characteristic due to the scattering of the coated particles.  
Figure 13a,b display the correlation between the gloss values (85\({}^{\circ}\) angle) and the luminescent characteristics (\(\lambda_{\rm em}\)\({}^{\rm max}\) around 611 nm) of a security pigment according to the variation in Y\({}_{2}\)O\({}_{3}\):Eu\({}^{3+}\) amount loaded on MF or TMF. The luminescent property of Y\({}_{2}\)O\({}_{3}\):Eu@MF was overall better than that of Y\({}_{2}\)O\({}_{3}\):Eu@TMF due to the absorption UV of the TiO\({}_{2}\) layer coated on the MF surface. However, the gloss property of Y\({}_{2}\)O\({}_{3}\):Eu@TMF, by TMF having the high reflective layer of TiO\({}_{2}\) coated on MF, was higher compared with that of Y\({}_{2}\)O\({}_{3}\):Eu@MF. Therefore, we studied to enhance the security level along with optimizing the gloss and luminescent property of Y\({}_{2}\)O\({}_{3}\):Eu@TMF, which was prepared at Y\({}_{2}\)O\({}_{3}\): Eu\({}^{3+}\) loading amounts in the range of 15-25 wt%. Figure 13c shows the \"KICET\" mark printed on a black opacity chart using Y\({}_{2}\)O\({}_{3}\):Eu@MF or Y\({}_{2}\)O\({}_{3}\):Eu@TMF mixed with epoxy resin. One remarkable difference was observed in the mark under natural light. In the natural light, it is found that the gloss properties were stronger on the surface of Y\({}_{2}\)O\({}_{3}\):Eu@TMF than on Y\({}_{2}\)O\({}_{3}\):Eu@MF. On the other hand, the mark showed a red color under the portable UV lamp (\(\lambda_{\rm em}\) = 254 nm), and its red luminescent became greater for Y\({}_{2}\)O\({}_{3}\):Eu@MF than Y\({}_{2}\)O\({}_{3}\):Eu@TMF. Given this, it is confirmed that the relation between the gloss and luminescent is coincident with Figure 13a,b and the mark is possible for the application as a security pigment with multi-function.  
\begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Sample*** & **Gross of Angle** & **20\({}^{\circ}\)** & **60\({}^{\circ}\)** & **85\({}^{\circ}\)** \\ \hline \multirow{2}{*}{MF} & 4.8 & 17.1 & 19.3 \\ \cline{2-5}  & 10 wt\% ** & 3.9 & 14.8 & 15.6 \\ \cline{2-5}  & 20 wt\% & 4.5 & 16.3 & 18.2 \\ \hline \multirow{2}{*}{TMF} & 17.8 & 58.3 & 62.9 \\ \cline{2-5}  & 10 wt\% & 14.2 & 42.6 & 51.1 \\ \cline{2-5}  & 20 wt\% & 10.1 & 35.7 & 42.4 \\ \cline{2-5}  & 30 wt\% & 15.3 & 55.1 & 59.5 \\ \hline \hline \end{tabular}  
* Film prepared by mixing sample and resin. ** Y\({}_{2}\)O\({}_{3}\):Eu\({}^{3+}\) loading amount on MF or TMF.  
\end{table}
Table 2: Gloss values according to the variation in angle for the film prepared by MF, TMF, Y\({}_{2}\)O\({}_{3}\):Eu@MF and Y\({}_{2}\)O\({}_{3}\):Eu@TMF security pigments.