申请人:Samsung Display Co., Ltd.
公开号:US20210234098A1
公开(公告)日:2021-07-29
A light emitting diode of an embodiment includes a first electrode, a hole transport region disposed on the first electrode, an emission layer disposed on the hole transport region, an electron transport region disposed on the emission layer, and a second electrode disposed on the electron transport region. The hole transport region includes a first hole transport layer disposed adjacent to the first electrode and having a first refractive index, a second hole transport layer disposed adjacent to the emission layer and having a second refractive index, and a third hole transport layer disposed between the first hole transport layer and the second hole transport layer and having a third refractive index which is greater than each of the first refractive index and the second refractive index, thereby showing high light extraction efficiency and high emission efficiency properties.
一种实施例的发光二极管包括第一电极,设置在第一电极上的空穴传输区域,设置在空穴传输区域上的发射层,设置在发射层上的电子传输区域,以及设置在电子传输区域上的第二电极。空穴传输区域包括邻近第一电极的第一空穴传输层,具有第一折射率;设置在发射层旁的第二空穴传输层,具有第二折射率;以及设置在第一空穴传输层和第二空穴传输层之间的第三空穴传输层,具有大于第一折射率和第二折射率的第三折射率,从而显示出高光提取效率和高发射效率特性。