✅ Statement I: Correct Rare earth elements like europium, terbium, and yttrium are essential in flat TV screens and monitors due to their role in producing vibrant colors and enhancing display quality.

✅ Statement II: Correct These elements exhibit phosphorescence—absorbing energy and slowly emitting light—which is key to their use in color reproduction and brightness in displays.

Relationship: Statement II explains why rare earth elements are crucial in displays, confirming the reason behind Statement I.

Therefore, both statements are correct and related.