There are CRTs with long-persistence phosphors too; they found applications in radar and the like: https://en.wikipedia.org/wiki/Phosphor#Standard_phosphor_typ

There are CRTs with long-persistence phosphors too; they found applications in radar and the like: https://en.wikipedia.org/wiki/Phosphor#Standard_phosphor_types https://en.wikipedia.org/wiki/Phosphor#Standard_phosphor_typ... https://tubetime.us/index.php/2015/10/31/crt-phosphor-video/ https://tubetime.us/index.php/2015/10/31/crt-phosphor-video/ http://www.labguysworld.com/crt_phosphor_research.pdf http://www.labguysworld.com/crt_phosphor_research.pdf The P10 phosphor there claims "Persistence from several seconds to several months"(!)