ORGANIC LIGHT-EMITTING DEVICE AND PREPARING METHOD THEREOF

摘要

An organic light-emitting device (100) comprises a substrate (10), an anode (20), a functional layer (30), and a cathode (40) which are sequentially laminated. The functional layer (30) comprises a hole transmission layer which has a quantum well structure (301). The quantum well structure (301) comprises potential barrier units (3011) and potential well units (3012) matching with each other, at most one potential well unit (3012)is provided between two adjacent potential barrier units (3011), the potential barrier units (3011) are provided at two ends of the quantum well structure (301), and the HOMO energy level of the potential barrier unit (3011) in the quantum well structure (301) is lower than the HOMO energy level of the potential well unit (3012) that is adjacent to and matches with the potential barrier unit (3011). In the organic light-emitting device (100), the hole transmission layer is designed to have the quantum well structure (301), the potential well depth of the multi-layer quantum well structure (301) is arranged according to gradient, and with decrease of the gradient in the hole transmission direction, the gradient of the potential well depth can be adjusted to improve the hole transmission efficiency, which implements injection balance of carriers. Therefore, the organic light-emitting device (100) has high light-emitting efficiency, and the preparing method is easy and convenient to use.