Patent ID: 8404153
Filing Date: 2013-03-26
Classification: C09K

Abstract:
1. A blend of a first persistent phosphor, a second persistent phosphor and a third non-persistent phosphor, wherein said first persistent phosphor has a formula I: where x is between 0.75 and 1.3; y is between about 0.0005 and about 0.1; z is between about 0.0005 and about 0.1; a is between about 0 and about 0.2; A is one or both of Sr and Ba; m is between about 0 and about 0.3; n is between about 0 and about 0.1; o is between about 0 and about 0.01; p is between about 0 and about 0.10; RE is any rare earth ion and d ranges from about 3.945 to about 4.075; wherein said second persistent phosphor has a formula II: where x is between 3.0 and 5.2; y is between about 0.0005 and about 0.1; z is between about 0.0005 and about 0.1; a is between about 0 and about 0.2; A is one or both of Ca and Ba; m is between about 0 and about 0.3; n is between about 0 and about 0.1; o is between about 0 and about 0.01; p is between about 0 and about 0.10; RE is any rare earth ion and d ranges from about 23.945 to about 26.425; and wherein said third phosphor is a non-persistent phosphor that is excited at a wavelength in a range of 300-500 nm.