I want to make a Little LED from scratch
A practical one? Probabaly not. An edible one https://www.instructables.com/id/LED-Lights-Gummy-Candy-Edible-Glowing-candy/ YEP! There was a light bulb someone made from scratch that was cool and possible https://www.instructables.com/id/Homemade-Lightbulb/. You could rig up a bulb and a diode?
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This guy here attempted to make OLEDs at home. List of supplies materials etc pretty thorough!
Yes. See here: http://www.dlip.de/?p=99