Hitachi Research Laboratory (HRL) of Hitachi Ltd exhibited a prototype of an OLED lighting panel made by using a coating process at Lighting Fair 2013 from March 3 to 8, 2013, in Tokyo.   For the panel, HRL used the "spontaneous multilayer light-emitting layer formation material," which enables to make an OLED lighting panel just by applying HRL's own red (R), green (G) and blue (B) light-emitting materials once. In general, white OLED lighting panels made by using a coating process are made by applying RGB light-emitting material...