申请人:Samsung Electronics Co., Ltd.
公开号:US10741772B2
公开(公告)日:2020-08-11
An organic light-emitting device (OLED) includes a first electrode, a second electrode, an emission layer between the first electrode and the second electrode and including an electron-transporting host and a hole-transporting host, a hole transport region between the first electrode and the emission layer and including a hole transport layer, and an electron transport region between the emission layer and the second electrode and including an electron transport layer, wherein the OLED satisfies Equations 1 and 2 below:
0.75 eV≤|LUMOH(ET)−LUMOH(HT)|≤0.90 eV
|E(S1,H(ET))−E(S1,H(HT))|<0.15 eV
wherein in Equations 1 and 2, LUMOH(ET) refers to a lowest unoccupied molecular orbital (LUMO) energy level of the electron-transporting host, LUMOH(HT) refers to an LUMO energy level of the hole-transporting host, E(S1, H(ET)) refers to a singlet energy level of the electron-transporting host, and E(S1, H(HT)) refers to a singlet energy level of the hole-transporting host.
一种有机发光器件(OLED)包括第一电极、第二电极、第一电极和第二电极之间的发射层(包括电子传输宿主和空穴传输宿主)、第一电极和发射层之间的空穴传输区域(包括空穴传输层)以及发射层和第二电极之间的电子传输区域(包括电子传输层),其中 OLED 满足以下公式 1 和 2:
0.75 eV≤|LUMOH(ET)-LUMOH(HT)|≤0.90 eV
|E(S1,H(ET))-E(S1,H(HT))|
其中等式 1 和 2 中,LUMOH(ET) 指电子传输宿主的最低未占分子轨道 (LUMO) 能级,LUMOH(HT) 指空穴传输宿主的 LUMO 能级,E(S1, H(ET)) 指电子传输宿主的单电子能级,E(S1, H(HT)) 指空穴传输宿主的单电子能级。