Patent ID: 9419238
Filing Date: 2016-08-16
CPC Classification: H01L

Claim Text:
1. A PIN type organic light emitting diode (OLED) comprising: a first electrode, of a first electrode type, configured to inject a first type of charge carrier from among one of an electron and a hole; a first transport layer, of the first type of charge carrier, doped by a first type of dopant adapted to the first type of charge carrier; an emission layer; a second transport layer, of a second type of charge carrier different from the first type of charge carrier, doped by a second type of dopant different from the first type of dopant; and a second electrode, of a second electrode type different from the first electrode type, configured to inject the second type of charge carrier, wherein at least one of the first transport layer and the second transport layer comprises at least two elementary transport layers, and wherein each elementary transport layer of a same transport layer has a mobility of charge carriers that is less than a mobility of charge carriers of an adjacent elementary transport layer, said adjacent elementary transport layer contacts said elementary transport layer and is located farther from the emission layer than said elementary transport layer, and wherein the elementary transport layers of a same first or second transport layer have a same dopant concentration.