Quantum Dot Light-emitting Device and Display Device

A quantum dot light-emitting device, comprising a concave frame having a chip mounting region, wherein, further comprising:

• a light-emitting diode chip disposed in the chip mounting region, the light-emitting diode chip adapted to emit a first light;
• a quantum dot layer disposed on the light exit direction of the light-emitting diode chip;
• a functional layer disposed between the light-emitting diode chip and the quantum dot layer, the functional layer is a first functional layer or a second functional layer;
• the first functional layer has a reflectivity greater than or equal to R with respect to the first light having angle of incidence less than or equal to i, and the first functional layer has a reflectivity less than R with respect to the first light having angle of incidence greater than i, wherein R≤90%, i>0;
• the second functional layer is a reflective polarizing film layer, the second functional layer reflects light having a first polarized state in the first light and transmits light having a second polarized state in the first light, the light having the first polarized state is orthogonal to the light having the second polarized state.