Red light emitting long afterglow photoluminescence phosphor and afterglow lamp thereof

An Eu activated red light emitting afterglow photoluminescence phosphor having the formula:

• Ln2O2S :Eux,Mgy,M′z
• 0.00001≦x≦0.5
• 0.00001≦y≦0.3
• 0.00001≦z≦0.3
• wherein Ln is at least one member selected from the group consisting of Y, La, Gd and Lu;
• Mg is a first coactivator;
• and M′ is a second coactivator which is at least one member selected from the group consisting of Ti, Nb, Ta and Ga.

In an afterglow lamp comprising a light emitting section which converts electric energy to optical energy, including a transparent glass covering therefor, the improvement comprising a fluorescent layer provided at least either on the inner surface or on the outer surface of said transparent glass, and said fluorescent layer comprising an Eu activated red light emitting afterglow photoluminescence phosphor having the following formula:

• Ln2O2S :Eux,My
• 0.00001≦x≦0.5
• 0.00001≦y≦0.3
• wherein Ln is at least one member selected from the group consisting of Y, La, Gd and Lu;
• M is a coactivator which is at least one member selected from the group consisting of Nb, Ta and Ga in the formula.

In a lamp comprising a light emitting section which converts electric energy to optical energy, and a transparent glass covering thereon, the improvement comprising a Eu activated fluorescent layer provided on at least one side either the inner surface or the outer surface of said transparent glass, and said fluorescent layer having a red light emitting afterglow photoluminescence phosphor which is represented by the following formula:

• Ln2O2S:Eux,Mgy,M′z
• 0.00001≦x≦0.5
• 0.00001≦y≦0.3
• 0.00001≦z≦0.3
• wherein Ln in the formula is at least one member selected from the group consisting of Y, La, Gd and Lu;
• Mg is a first coactivator and M′ is a second coactivator, which second coactivator is at least one member selected from the group consisting of Ti, Nb, Ta and Ga.