Patent ID: 8741793

Claim:
A method for manufacturing decorative and/or utilitarian articles made of luminescent crystal comprising at least the step of incorporating an optically transparent glass material comprising: at least 50% silica by weight; at least 10% lead by weight; and one or more luminescent active centers chosen from mixtures of the following rare-earth ions: (Eu 3+ /Tb 3+ ), (Tb 3+ /Tm 3+ ), (Eu 3+ /Tm 3+ ) and (Eu 3+ /Tb 3+ /Tm 3+ ), said rare-earth ions mixtures being introduced respectively in the form of (Eu 2 O 3 /Tb 4 O 7 ), (Tb 4 O 7 /Tm 2 O 3 ), (Eu 2 O 3 /Tm 2 O 3 ) and (Eu 2 O 3 /Tb 4 O 7 /Tm 2 O 3 ), during the manufacturing process.