Patent ID: 8506843
Filing Date: 2013-08-13
Classification: C09K

Abstract:
1. A persistent phosphor having the following formula I: where a and b each range from about 0.3 to about 0.7; c is between 0 and about 0.1; 0.75≦a+b+c+y+z≦1.3; y is between about 0.0005 and about 0.1; RE is any rare earth element alone or in combination; z is between about 0.0005 and about 0.15; m is between about 0.0005 and about 0.30; n is between 0 and about 0.10; o is between 0 and about 0.01; p is between 0 and about 0.10 and d ranges from about 3.945 to about 4.075, wherein once said persistent phosphor has been excited said persistent phosphor appears white in an absence of ambient light.