Organic light emitting diode display substrate having band gap layer, manufacturing method thereof, and display device

An organic light emitting diode display substrate, comprising:

• a light emitting unit layer;
• a color conversion layer;
• and
• a second band gap layer,
• wherein the color conversion layer and the second band gap layer are on a light exit path of the light emitting unit layer,
• wherein the light emitting unit layer comprises a first light emitting unit, a second light emitting unit, and a third light emitting unit periodically arranged on a driving substrate and configured to emit light of a first color,
• wherein the color conversion layer is configured to convert a part of the light of the first color into light of a second color and light of a third color, respectively,
• wherein the second band gap layer is on a side of the color conversion layer away from the light emitting unit layer, and
• wherein the second band gap layer comprises a stacked structure layer, the stacked structure layer comprises a first inorganic layer, a first organic layer, and a second inorganic layer stacked in sequence, and a refractive index of any one of the first inorganic layer, the first organic layer, and the second inorganic layer is in a range of 1.3 to 2.4.

A method for manufacturing an organic light emitting diode display substrate, comprising:

• forming a light emitting unit layer that is configured to emit light of a first color, the light emitting unit layer comprising a first light emitting unit, a second light emitting unit, and a third light emitting unit periodically arranged on a driving substrate;
• and
• forming a first band gap layer and a color conversion layer,
• wherein the first band gap layer is between the light emitting unit layer and the color conversion layer and overlaps the second light emitting unit and the third light emitting unit,
• wherein the color conversion layer is configured to convert a part of the light of the first color into light of a second color and light of a third color, respectively, and
• wherein the first band gap layer comprises a stacked structure layer forming a two-dimensional photonic crystal structure, the stacked structure layer comprises a first inorganic layer, a first organic layer, and a second inorganic layer stacked in sequence, and a refractive index of any one of the first inorganic layer, the first organic layer, and the second inorganic layer is in a range of 1.3 to 2.4.