Jeri Ellsworth demonstrates the basic principles behind brewing your own OLEDs, and continues her little tutorial on semiconductor physics by showing how the “band gap” in materials works.

Making an OLED – Light from Plastics

More:

• Jeri homebrews some point-contact transistors
• Jeri experiments with electroluminescent phosphor
• Jeri homebrews her own EL ink!
• Jeri Ellsworth turns an LCD into an EL display
• More EL wire (and display) hacking with Jeri Ellsworth