OLED display substrate having a quantum dot color film layer, manufacturing method of the same, and display apparatus

An organic light-emitting diode (OLED) display substrate, comprising:

• a first blue OLED light-emitting layer covering an entirety of an active area of the OLED display substrate;
• one or more additional blue OLED light-emitting layers arranged in a stacking manner with the first blue OLED light-emitting layer;
• and
• a quantum-dot color film layer on a light-exiting side of the first blue OLED light-emitting layer and the one or more additional blue OLED light-emitting layers,
• wherein, a wavelength of blue light emitted by at least one blue OLED light-emitting layer among the one or more additional blue light OLED light-emitting layers is different from a wavelength of blue light emitted by the first blue OLED light-emitting layer, and
• wherein the first blue OLED light-emitting layer is between a first anode and a first cathode, and the one or more additional blue OLED light-emitting layers are between a second anode and a second cathode.

A method of manufacturing an organic light-emitting diode (OLED) display substrate, comprising:

• forming one or more blue OLED light-emitting layers in an active area on a substrate;
• forming a first blue OLED light-emitting layer covering an entirety of the active area of the OLED display substrate on the one or more blue OLED light-emitting layers, wherein a wavelength of blue light emitted by at least one blue OLED light-emitting layer among the one or more blue OLED light-emitting layers is different from a wavelength of blue light emitted by the first blue OLED light-emitting layer;
• forming a quantum-dot color film layer on a light-exiting side of the first blue OLED light-emitting layer and the one or more blue OLED light-emitting layers,
• wherein, the wavelength of the blue light emitted by the first blue OLED light-emitting layer is in a range of 400 nm-440 nm, forming the one or more blue OLED light-emitting layers in the active area on the substrate comprises forming a second blue OLED light-emitting layer in the active area on the substrate, wherein a wavelength of blue light emitted by the second blue OLED light-emitting layer is in a range of 440 nm-490 nm,
• wherein, prior to forming the second blue OLED light-emitting layer in the active area on the substrate, the method further comprises:
• forming an anode on the substrate,
• wherein, after forming the second blue OLED light-emitting layer in the active area on the substrate, prior to forming the first blue OLED light-emitting layer covering the entirety of the active area of the OLED display substrate on the second blue OLED light-emitting layer, the method further comprises sequentially forming a charge generation layer and a first hole injection layer on the second blue OLED light-emitting layer, and
• wherein, after forming the first blue OLED light-emitting layer covering the entirety of the active area of the OLED display substrate on the second blue OLED light-emitting layer, prior to forming the quantum-dot color film layer on the light-exiting side of the first blue OLED light-emitting layer and the second blue OLED light-emitting layers, the method further comprises forming a cathode on the first blue OLED light-emitting layer.