| 摘要 |
An organic light emitting diode device (100) has a substrate (102), a cathode (110) formed on the substrate (102), an anode (190) spaced-apart from the cathode (110), a plurality of electroluminescent units (120a,120b, 120n) stacked between the cathode (110) and the anode (190), and a plurality of charge generation layers (150a, 150b), each of which is formed between two adjacent electroluminescent units. Each electroluminescent unit (120a,120b, 120n) has an electron-transport layer (130), an emission layer (135) formed on the electron-transport layer (130), and a hole-transport layer (140) formed on the emission layer (135). The electron-transport layer (130a) of the first electroluminescent unit (120a) is formed on the cathode (110), defining a first energy barrier, and the anode (190) is formed on the hole-transport layer (140n) of the last electroluminescent unit (120n), defining a second energy barrier. The first energy barrier is higher than the second energy barrier. The first electroluminescent unit (120a) has a lifetime longer than that of each of the rest electroluminescent units (120b,120n). |
