Hi to all,
Evolution of color CRT phosphors in Wikipedia article :
"The red phosphor saw the most changes; it was originally manganese-activated zinc phosphate, then a silver-activated cadmium-zinc sulfide, then the europium(III) activated phosphors appeared; first in an yttrium vanadate matrix, then in yttrium oxide and currently in yttrium oxysulfide. The evolution of the phosphors was therefore (ordered by B-G-R):"
Blue--------Green-----------Red
ZnS:Ag Zn2SiO4:Mn Zn3(PO4)2:Mn
ZnS:Ag (Zn,Cd)S:Ag (Zn,Cd)S:Ag
ZnS:Ag (Zn,Cd)S:Ag YVO4:Eu3+ (1964?)
ZnS:Ag (Zn,Cd)S:Cu,Al Y2O2S:Eu3+ or Y2O3:Eu3+
ZnS:Ag ZnS:Cu,Al or ZnS:Au,Cu,Al Y2O2S:Eu3+
article is here:
https://en.wikipedia.org/wiki/Phosphor
Europium doping was a game changer finally allowing equivalent drive & beam currents on all 3 guns.
developed by Sylvania if i recall correctly. June 1964 announcement by Sylvania in Electronics World :
https://schematicsforfree.com/files/...TV%20Tubes.pdf
for pure CRT enjoyment, read "The Cathode Ray Tube" by Peter A Keller, THE definitive publication on the subject.
download pdf here, 330 pages, 50Mb :
https://docs.ampnuts.ru/eevblog.docs...athode-ray.pdf
Merry Christmas to all !
Best Regards
jhalphen
Paris/France
Sylvania 1964 advert for ColorBright-85 CRT: