Visual properties of some luminescent materials

phosphor emission

(phosphor/activator; coactivator) colour* persistence

rhombohedral zinc orthosilicate/manganese 0.3%; 1,200 degrees C; 60 min, slow cooling green

(525 nm) short

(0.01 sec)

beta zinc orthosilicate/manganese 0.3%; 1,600 degrees C; 10 min, quench cooling yellow

(610 nm) short

(0.01 sec)

cubic zinc sulfide/copper 0.03%; chloride; 950 degrees C; 10 min, slow cooling green-blue

(516 nm) long

(hours)

hexagonal zinc sulfide/copper 0.03%; chloride; 1,250 degrees C; 10 min, slow cooling green

(528 nm) very long

(up to 24 hours)

*The wavelengths of the respective emission maxima are given in parentheses.

1 nanometre (nm) = 0.000000001 metre = 1 millimicron = 10 angstroms.