Display panel, preparation method thereof and display device

Abstract

A display panel (100) and a preparation method thereof and a display device, the display panel (100) comprising a first electrode layer (2), an electron transport layer (3), a light-emitting layer (4), a hole transport layer (5), a hole injection layer (6) and a second electrode layer (7) which are sequentially stacked. The material of the hole injection layer (6) comprises a first metal oxide and a second metal oxide, the first metal oxide and the second metal oxide both contain a first metal element, the number of outermost electrons of the first metal element in the first metal oxide is different from that in the second metal oxide, that is, the valence of the first metal element in the two metal compounds is different, and therefore the hole injection capability is improved.

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