Display substrate, manufacturing method therefor, and display apparatus

A display substrate comprising multiple top-emission quantum dot light-emitting devices, and each of the multiple top-emission quantum dot light-emitting devices comprising:

• a first electrode and a second electrode arranged opposite to each other;
• a quantum dot light-emitting layer between the first electrode and the second electrode;
• and
• an electron transport layer between the first electrode and the quantum dot light-emitting layer;
• wherein, a metal reflection layer is provided inside the electron transport layer;
• wherein the multiple top-emission quantum dot light-emitting devices comprise multiple top-emission quantum dot light-emitting devices with different emission wavelengths;
• and
• a distance between the metal reflection layer and the first electrode in each of the multiple top-emission quantum dot light-emitting devices is inversely correlated with an emission wavelength of the each of the multiple top-emission quantum dot light-emitting devices;
• wherein a proportion of oxygen vacancies on a surface of the electron transport layer in contact with the first electrode is less than a proportion of oxygen vacancies on a surface of the electron transport layer in contact with the metal reflection layer;
• and
• wherein a ratio of an area of the metal reflection layer to an area of the electron transport layer in each of the multiple top-emission quantum dot light-emitting devices ranges from 50% to 100%.