Miniature light emitting diode, preparation method thereof and display panel

The invention discloses a miniature light emitting diode, a preparation method thereof and a display panel. The miniature light-emitting diode comprises an epitaxial laminated layer and a current expansion layer, the upper surface of the epitaxial laminated layer comprises an ohmic contact region and a non-ohmic contact region, and the non-ohmic contact region at least comprises an outer edge region located on the periphery of the upper surface of the epitaxial laminated layer; the surface of the outer edge area is subjected to ion implantation treatment; and the current expansion layer is positioned on the ohmic contact region. The miniature light-emitting diode can realize low-current density efficiency improvement. 本发明公开一种微型发光二极管及其制备方法和显示面板。所述微型发光二极管包括外延叠层和电流扩展层，所述外延叠层的上表面包括欧姆接触区和非欧姆接触区，所述非欧姆接触区至少包括位于所述外延叠层上表面周边的外边缘区；所述外边缘区的表面经过离子注入处理；所述电流扩展层位于所述欧姆接触区上。所述微型发光二极管能够实现小电流密度效率提升。