TFT screens work in a different way, but they also convert electrical energy into light energy. As with fluorescence, the light does not come out immediately. In a TV, the response must be quick, or moving images will be smeared. But in a radar screen, where the electron beam scans in synchronism with the rotating antenna, the persistence of the light needs to be quite long, to keep the picture filled in between visits from the beam - The picture below shows light from an 11 W fluorescent lamp, coming off a compact disc. Although the light was not sent through a narrow slit, which would have improved the image, you can see that the spectrum is clearly not continuous.
Fluorescent light is very unsuitable for colour matching.
Although it can be made to look almost white to the eye, this is not enough. The process of evaluating colour is affected by the spectrum of the incident light, the spectrum of the reflecting object, the spectral responses of the three types of colour receptors in the eye, and the interpretational powers of the eye-brain combination. For example, yellow light might be formed by a narrow spectral spread, as in the sodium lamp used for street lighting, or it might be formed by a wide spectrum of red, orange and green. Similarly, a yellow object might reflect in only a narrow yellow band of light, or it might reflect green and red, but not yellow. These two objects would respond in totally different ways to the two light sources.