| PATENT CLAIMS |
Long afterglow luminescent material, comprising silicates with activators, having chemical compn.:
- aSrO.bMgO.cSiO2.dB2O3:(Eu)x,(Nd)y; wherein a = 0.6-6,
b < 5, c = 1-9, d < 0.7, x = 0.00001-0.2 & y < 0.3
Said material is capable of emitting an emission spectrum ranging from 420 to 650 nm when excited by short wavelength light 250-500 nm with peak position of emission spectrum 450-580 nm & wherein the long afterglow luminescent color of said material is blue, bluish-green, green, greenish-yellow or yellow
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