Light-emitting device and electronic apparatus including same

A light-emitting device comprising:

• a first electrode;
• a second electrode facing the first electrode;
• emission units in the number of x stacked between the first electrode and the second electrode;
• and
• x−1 charge generating layer(s) located between each two adjacent emission units from among the emission units in the number of x, each of the x−1 charge generating layer(s) comprising an n-type charge generating layer and a p-type charge generating layer,
• wherein:
• x is an integer of 2 or greater;
• each of the emission units in the number of x comprise a charge transport region and an emission layer that are sequentially stacked above the first electrode;
• light emitted from the emission units in the number of x passes to the outside through the second electrode;
• is the first electrode is a reflective electrode;
• the first electrode comprises a transparent layer and a reflective layer;
• and
• Equation y and Equation y+1 are satisfied as follows:
• Ly−ay≤Dy≤Ly+ay Equation y
• wherein, in Equation y, Dy is a distance between i) an interface between the transparent layer of the first electrode and the charge transport region of the first emission unit and ii) an interface between the emission layer of the yth emission unit from among the emission units in the number of x and the charge transport region of the yth emission unit from among the emission units in the number of x, Ly is a yth resonance distance of light emitted from the emission layer of the yth emission unit from among the emission units in the number of x, and ay is a real number in a range of about 0 nm to about 50 nm,
• Ly+1−ay+1≤Dy+1≤Ly+1+ay+1 Equation y+1
• wherein, in Equation y+1, Dy+1 is a distance between a) an interface between the reflective layer of the first electrode and the transparent layer of the first electrode and b) an interface between the emission layer of the yth emission unit from among the emission units in the number of x and the charge transport region of the yth emission unit from among the emission units in the number of x, Ly+1 is a (y+1)th resonance distance of light emitted from the emission layer of the yth emission unit from among the emission units in the number of x, and ay+1 is a real number in a range of about 0 nm to about 50 nm.

A light-emitting device comprising:

• a first electrode;
• a second electrode facing the first electrode;
• a first emission unit located between the first electrode and the second electrode;
• a second emission unit located between the first emission unit and the second electrode;
• and
• a charge generating layer located between the first emission unit and the second emission unit and comprising an n-type charge generating layer and a p-type charge generating layer,
• wherein:
• the first emission unit comprises a first charge transport region and a first emission layer that are sequentially stacked on the first electrode;
• the second emission unit comprises a second charge transport region and a second emission layer that are sequentially stacked on the first electrode;
• light emitted from the first emission unit and the second emission unit passes to the outside through the second electrode;
• the first electrode is a reflective electrode;
• the first electrode comprises a transparent layer and a reflective layer;
• and
• Equation 11, Equation 12, Equation 22, and Equation 23 are satisfied as follows:
• L11−a11≤D11≤L11+a11 Equation 11
• wherein, in Equation 11,
• D11 is a distance between i) an interface between the transparent layer of the first electrode and the first charge transport region of the first emission unit and ii) an interface between the first emission layer of the first emission unit and the first charge transport region of the first emission unit, L11 is a first resonance distance of light emitted from the first emission layer of the first emission unit, and a11 is a real number in a range of about 0 nm to about 50 nm;
• L12−a12≤D12≤L12+a12 Equation 12
• wherein, in Equation 12, D12 is a distance between a) an interface between the reflective layer of the first electrode and the transparent layer of the first electrode and b) an interface between the first emission layer of the first emission unit and the first charge transport region of the first emission unit, L12 is a second resonance distance of light emitted from the first emission layer of the first emission unit, and a12 is a real number in a range of about 0 nm to about 50 nm;
• L22−a22≤D22≤L22+a22 Equation 22
• wherein, in Equation 22, D22 is a distance between iii) an interface between the transparent layer of the first electrode and the second charge transport region of the second emission unit and iv) an interface between the second emission layer of the second emission unit and the second charge transport region of the second emission unit, L22 is a second resonance distance of light emitted from the second emission layer of the second emission unit, and a22 is a real number in a range of about 0 nm to about 50 nm;
• and
• L23−a23≤D23≤L23+a23 Equation 23
• wherein, in Equation 23,
• D23 is a distance between c) an interface between the reflective layer of the first electrode and the transparent layer of the first electrode and d) an interface between the second emission layer of the second emission unit and the second charge transport region of the second emission unit, L23 is a third resonance distance of light emitted from the second emission layer of the second emission unit, and a23 is a real number in a range of about 0 nm to about 50 nm.