Light-emitting device and electronic apparatus including the same

A light-emitting device comprising:

• a first electrode;
• a second electrode facing the first electrode;
• and
• an interlayer arranged between the first electrode and the second electrode,
• wherein the interlayer comprises a first emission layer and a second emission layer,
• the first emission layer comprises a first host and a first dopant capable of emitting a first light having a first photoluminescence spectrum,
• the first host comprises m1 hosts, where m1 is an integer of 1 or more, and when m1 is 2 or more, the two or more hosts present in the first emission layer are each different from the other,
• the second emission layer comprises a second host and a second dopant capable of emitting a second light having a second photoluminescence spectrum,
• the second host comprises m2 hosts, where m2 is an integer of 1 or more, and when m2 is 2 or more, the two or more hosts present in the second emission layer are each different from the other,
• the first dopant comprises a first transition metal, and the second dopant comprises a second transition metal,
• wherein the first dopant and the second dopant are different from each other, and Expression 1 and Expression 2 are satisfied:
• PDM
• ⁡
• (
• D
• ⁢
• 1
• )
• <
• PDM
• ⁡
• (
• D
• ⁢
• 2
• )
• Expression
• ⁢
• 1
• PDM
• ⁡
• (
• H
• ⁢
• 1
• )
• >
• PDM
• ⁡
• (
• H
• ⁢
• 2
• )
• Expression
• ⁢
• 2
• wherein, in Expressions 1 and 2,
• PDM(D1) is a permanent dipole moment of the first dopant and has a unit of debye,
• PDM(D2) is a permanent dipole moment of the second dopant and has a unit of debye,
• PDM(H1) is ▮ which is a permanent dipole moment average value of the m1 hosts present in the first host, and has a unit of debye, wherein i) x is a variable of 1 to m1, ii) PDM(Hx) is a permanent dipole moment of an xth host in the first emission layer and has a unit of debye, and iii) W(Hx) is a weight fraction of the xth host relative to a total weight of the first host, and is calculated as (a weight of the xth host in the first emission layer/a total weight of the first host),
• PDM(H2) is ▮ which is a permanent dipole moment average value of the m2 hosts present in the second host, and has a unit of debye, wherein i) y is a variable of 1 to m2, ii) PDM(Hy) is a permanent dipole moment of an yth host in the second emission layer and has a unit of debye, and iii) W(Hy) is a weight fraction of the yth host relative to a total weight of the second host, and is calculated as (a weight of the yth host in the second emission layer/a total weight of the second host), and
• each of PDM(D1), PDM(D2), PDM(Hx), and PDM(Hy) is calculated based on density functional theory (DFT).