Patent ID: 7686979

Claim:
A long afterglow luminescent material, characterized in that it is a composite aluminate luminescent material comprising sulfur and/or selenium, or comprising sulfur and/or selenium and phosphorus as well as activator ions, its main chemical composition is expressed by the following formula: a MO·b M′(S β Se 1-β )·c Al 2 O 3 ·d B 2 O 3 ·e P 2 O 5 : x Eu·y Ln wherein: M is/are selected from Sr, Ca, Ba, and Mg, and any combinations thereof; M′ is/are selected from Sr, Ca, and Ba, and any combinations thereof; Ln is/are selected from Nd, Dy, Ho, Tm, La, Ce, Er, Pr, Bi, and Sm, and any combinations thereof; a, b, c, d, e, x and y are mole ratios, wherein 0.5<a<6.0, 0.0001≦b≦2.0, 0.5≦c≦9.0, 0≦d≦1.0, 0≦e≦1.0, 0.00001≦x≦0.25, 0.00001≦y≦0.3, 0≦β≦1.0, 0.5<(a+b)≦6.0, 0<(d+e)≦1.0.