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Japan's Tazmo has developed a new flexible Inorganic LED panel that is quite efficient at 30 lm/W. Tazmo is using a coating process - which is easily adapter for I-LEDs as they have a simpler element structure when compared to OLEDs.
The new panel is A4 in size (210x297mm) and can easily be bent. I-LED is different from LEDs as they use the EL (electroluminescence) phenomenon. We do not know how close to commercialization this is: