Organic light emitting diode

US9130185B2 · kind B2 · utility

Assignee

• Xiamen Tianma Micro-Electronics Co., Ltd. · CN

Inventor

• Wenjing Lin · Xiamen, CN

Key dates

• Filing date: May 20, 2013
• Grant date: Sep 8, 2015
• Expiry date: Jul 10, 2033

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10K85/631

Abstract

An OLED is disclosed which includes an anode, a hole transport layer, a light emitting layer, an electron transport layer, and a cathode. The light emitting layer includes a first phosphorescent light emitting layer, a blue fluorescent light emitting layer, and a second phosphorescent light emitting layer, which are stacked along a direction from the anode to the cathode. The first phosphorescent light emitting layer includes a material capable of conducting holes and blocking electrons. The second phosphorescent light emitting layer includes a material capable of conducting electrons and blocking holes. The blue fluorescent light emitting layer includes a material capable of conducting both holes and electrons. With the phosphorescent light emitting layers having a function of restricting charges, the exciton recombination zone is constrained in the blue fluorescent light emitting layer.