[old_tv_nut]

More about confusion of emission decay with non-linearity (around 15:00 or so):

The sulfide phosphors (blue and green) did suffer from non-linearity at high beam current density. The rare-earth reds did not. This was not a problem in direct-view CRTs as the current density was not too high (except in Zenith's tri-potential tubes, which had too sharp a beam at optimum focus, turning highlights pink).

Projection sets however, had a very noticeable shift in highlight color. The green phosphor nonlinearity was fixed variously by going back to P1 phosphor (Zenith) or in some sets by using a rare-earth green, which, however, suffered from producing a paler desaturated green color. The blue phosphor nonlinearity was compensated with an opposite non-linearity in the blue video driver.