The invention relates to the field of organic light-emitting. An electrode comprises a first film layer, a second film layer and a third film layer which are stacked up. The first film layer is a conductive layer of which work function is not smaller than 4.2eV. The second film layer is an electron transport material layer. The work function of the third film layer is 3eV. Through research, an applicant discovers that according to a multilayer combined electrode structure, the stability of the electrode can be effectively improved, so the service life of the device is improved. The second filmlayer and the third film layer jointly form a charge generation layer, so generated electrons and holes are injected into the electron transport layer and the first film layer, the electron injectioncan be effectively assisted, and the efficiency of the device is improved.