Light-Emitting Device, Backlight Module, and Display Substrate

A light-emitting device, comprising:

• a first light conversion layer;
• a light-emitting portion located on a side of the first light conversion layer and used for emitting light;
• and
• a second light conversion layer located on a side of the light-emitting portion away from the first light conversion layer, wherein
• the first light conversion layer is configured to change a traveling direction of part of light incident on the first light conversion layer, so that the light with a change in the traveling direction exits in a direction towards the second light conversion layer, and a polarization direction of at least part of the light with the change in the traveling direction is changed;
• and
• the second light conversion layer is configured to change a traveling direction of part of light incident on the second light conversion layer, so that the light with a change in the traveling direction exits in a direction towards the first light conversion layer;
• and the second light conversion layer is configured to enable at least part of light entering the second light conversion layer to form linearly polarized light to exit from the light-emitting device.