Display device having light-emitting elements with bicarbonate-bonded metal oxide electron transport layers

1 . A light emitting element comprising:

a first electrode;

a second electrode disposed on the first electrode;

a light emitting layer disposed between the first electrode and the second electrode, and including a quantum dot;

a hole transport region disposed between the first electrode and the light emitting layer; and

an electron transport layer disposed between the light emitting layer and the second electrode, wherein

the electron transport layer includes an electron transport material, and

the electron transport material includes:

a metal oxide particle; and

a bicarbonate coupled to a surface of the metal oxide particle,

wherein the electron transport material comprises about 10 mol % to about 20 mol % of the bicarbonate, based on a total number of moles of the metal oxide particle.

2 . The light emitting element of claim 1 , wherein the metal oxide particle is represented by Formula 1:

Zn (1-x) Me x O  [Formula 1]

wherein in Formula 1,

0≤x≤0.5, and

Me includes at least one of Li, Be, Na, Mg, Al, K, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Ga, Ge, Rb, Sr, Zr, Nb, Mo, Ru, Rh, Pd, Ag, In, Sn, Sb, and Ba.

3 . The light emitting element of claim 1 , wherein the electron transport layer is directly disposed on the light emitting layer.

4 . The light emitting element of claim 1 , wherein the quantum dot does not comprise cadmium.

5 . The light emitting element of claim 1 , wherein the hole transport region comprises:

a hole injection layer; and

a hole transport layer disposed between the hole injection layer and the light emitting layer.

6 . A display device comprising a plurality of light emitting elements, wherein each of the light emitting elements includes:

a first electrode;

a second electrode disposed on the first electrode;

a light emitting layer disposed between the first electrode and the second electrode, and including a quantum dot;

a hole transport region disposed between the first electrode and the light emitting layer; and

an electron transport layer disposed between the light emitting layer and the second electrode, wherein

the electron transport layer includes an electron transport material, and

the electron transport material includes:

a metal oxide particle; and

a bicarbonate coupled to a surface of the metal oxide particle,

wherein the electron transport material comprises about 10 mol % to about 20 mol % of the bicarbonate, based on a total number of moles of the metal oxide particle.

7 . A display device comprising a plurality of light emitting elements, wherein each of the light emitting elements includes:

a first electrode;

a second electrode disposed on the first electrode;

a light emitting layer disposed between the first electrode and the second electrode, and including a quantum dot;

a hole transport region disposed between the first electrode and the light emitting layer; and

an electron transport layer disposed between the light emitting layer and the second electrode, wherein

the electron transport layer includes an electron transport material, and

the electron transport material includes:

a metal oxide particle; and

a bicarbonate coupled to a surface of the metal oxide particle, wherein the quantum dot comprises:

a first quantum dot emitting first color light;

a second quantum dot emitting second color light which has a wavelength longer than that of the first color light; and

a third quantum dot emitting third color light which has a wavelength longer than that of the second color light, and

the light emitting elements comprise:

a first light emitting element including the first quantum dot;

a second light emitting element including the second quantum dot; and

a third light emitting element including the third quantum dot.

8 . The display device of claim 7 , wherein the average diameter of the first to third quantum dots satisfies Equation 1:

average diameter of first quantum dot<average diameter of second quantum dot<average diameter of third quantum dot.  [Equation 1]

9 . The display device of claim 7 , wherein the hole transport region comprises:

a hole injection layer; and

a hole transport layer disposed between the hole injection layer and the light emitting layer.

10 . The display device of claim 6 , wherein the metal oxide particle is represented by Formula 1:

Zn (1-x) Me x O  [Formula 1]

wherein in Formula 1,

0≤x≤0.5, and

Me includes at least one of Li, Be, Na, Mg, Al, K, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Ga, Ge, Rb, Sr, Zr, Nb, Mo, Ru, Rh, Pd, Ag, In, Sn, Sb, and Ba.

11 . The display device of claim 6 , wherein the electron transport layer is directly disposed on the light emitting layer.

12 . The display device of claim 6 , wherein the quantum dot does not comprise cadmium.