Hole injection layer and organic electroluminescent device comprising same

The invention relates to a hole injection layer. The hole injection layer comprises a plurality of organic hole injection steps and a plurality of inorganic hole injection steps, and a mixed hole injection step is evaporated between the adjacent organic hole injection step and inorganic hole injection step. A hole injection layer comprises a plurality of organic hole injection steps and a plurality of inorganic hole injection steps which are alternately arranged in an evaporation mode, and mixed hole injection steps are arranged between the adjacent organic hole injection steps and inorganic hole injection steps in an evaporation mode. The efficiency of the organic light-emitting device can be obviously improved by about 20%, and the service life of the organic light-emitting device can be prolonged by about 50%. 本发明涉及一种空穴注入层，包括：交替蒸镀设置的若干有机空穴注入阶与若干无机空穴注入阶；其中，相邻的所述有机空穴注入阶与所述无机空穴注入阶间蒸镀有混合空穴注入阶。本发明的空穴注入层包括交替蒸镀设置的若干有机空穴注入阶与若干无机空穴注入阶，相邻的所述有机空穴注入阶与所述无机空穴注入阶间蒸镀有混合空穴注入阶，能够显著提升有机电致发光器件约20％的效率并延长有机电致发光器件约50％的使用寿命。