A display device is disclosed that includes a first substrate, a spacer disposed on the first substrate and including a side surface having a reverse tapered shape in a cross-sectional view, a protection pattern disposed on the spacer, and a second substrate disposed on the protection pattern and spaced apart from the first substrate to define a space.

A display device is disclosed that includes a first substrate, a spacer disposed on the first substrate and including a side surface having a reverse tapered shape in a cross-sectional view, a protection pattern disposed on the spacer, and a second substrate disposed on the protection pattern and spaced apart from the first substrate to define a space.

A display device includes a bank including an opening defining pixels, light emitting elements disposed in the pixels, a color conversion layer disposed on the light emitting elements in the opening, a capping layer overlapping the color conversion layer, and a color filter layer disposed on the capping layer. The color filter layer includes a low refractive material.

A display device includes a bank including an opening defining pixels, light emitting elements disposed in the pixels, a color conversion layer disposed on the light emitting elements in the opening, a capping layer overlapping the color conversion layer, and a color filter layer disposed on the capping layer. The color filter layer includes a low refractive material.

The invention relates to a preparation method of Na.sup.+/Cu.sup.2+ ions co-doped cesium lead bromide perovskite quantum dots, products and applications thereof, which belongs to the technical field of modification research of perovskite quantum dots. The invention discloses a preparation method of Na.sup.+/Cu.sup.2+ ions co-doped cesium lead bromide (CsPbBr.sub.3) perovskite quantum dots, which adopts lead bromide (PbBr.sub.2), oleic acid (OA), oleylamine (OAm), sodium ion precursors and copper ion precursors for the reaction preparation in octadecene (ODE), in which copper ions (Cu.sup.2+) and sodium ions (Na.sup.+) substitute A and B crystal sites in cesium lead bromide (CsPbBr.sub.3) perovskite fluorescent quantum dots respectively. The quantum dots have been effectively improved in photoluminescence quantum yield, thermal stability, etc., and can be used as an active layer to fabricate light emitting diodes which achieve the tuning of emission color from green to blue.

The invention relates to a preparation method of Na.sup.+/Cu.sup.2+ ions co-doped cesium lead bromide perovskite quantum dots, products and applications thereof, which belongs to the technical field of modification research of perovskite quantum dots. The invention discloses a preparation method of Na.sup.+/Cu.sup.2+ ions co-doped cesium lead bromide (CsPbBr.sub.3) perovskite quantum dots, which adopts lead bromide (PbBr.sub.2), oleic acid (OA), oleylamine (OAm), sodium ion precursors and copper ion precursors for the reaction preparation in octadecene (ODE), in which copper ions (Cu.sup.2+) and sodium ions (Na.sup.+) substitute A and B crystal sites in cesium lead bromide (CsPbBr.sub.3) perovskite fluorescent quantum dots respectively. The quantum dots have been effectively improved in photoluminescence quantum yield, thermal stability, etc., and can be used as an active layer to fabricate light emitting diodes which achieve the tuning of emission color from green to blue.

A display device includes a first substrate, a light-emitting unit disposed on the first substrate, an intermediate layer on the light-emitting unit, and a color filter layer on the intermediate layer. The intermediate layer has a first refractive index n1, the color filter layer has a second refractive index n2, and the first refractive index n1 is less than the second refractive index n2.

A display device includes a first substrate, a light-emitting unit disposed on the first substrate, an intermediate layer on the light-emitting unit, and a color filter layer on the intermediate layer. The intermediate layer has a first refractive index n1, the color filter layer has a second refractive index n2, and the first refractive index n1 is less than the second refractive index n2.

A display device is provided in the disclosure. The display device includes a first flexible substrate, a second flexible substrate, a display unit, a color conversion layer, a support layer, a first adhesive layer, a protective layer and a second adhesive layer. The second flexible substrate is disposed opposite to the first flexible substrate. The display unit is disposed between the first flexible substrate and the second flexible substrate. The color conversion layer is disposed between the second flexible substrate and the display unit. The support layer is disposed under the first flexible substrate. The first adhesive layer is disposed between the support layer and the first flexible substrate. The protective layer is disposed on the second flexible substrate. The second adhesive layer is disposed between the second flexible substrate and the protective layer.

A display device is provided in the disclosure. The display device includes a first flexible substrate, a second flexible substrate, a display unit, a color conversion layer, a support layer, a first adhesive layer, a protective layer and a second adhesive layer. The second flexible substrate is disposed opposite to the first flexible substrate. The display unit is disposed between the first flexible substrate and the second flexible substrate. The color conversion layer is disposed between the second flexible substrate and the display unit. The support layer is disposed under the first flexible substrate. The first adhesive layer is disposed between the support layer and the first flexible substrate. The protective layer is disposed on the second flexible substrate. The second adhesive layer is disposed between the second flexible substrate and the protective layer.