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 between the first electrode and the second electrode and comprising an emission layer,
• wherein the emission layer comprises a first compound comprising at least one IT electron-deficient nitrogen-containing C1-C60 heterocyclic group, a second compound comprising a group represented by Formula 2, or any combination thereof,
• wherein
• the emission layer comprises a sensitizer and an emitter,
• a spectral overlap integral of an emission spectrum of the sensitizer and an absorption spectrum of the emitter is at least 1×1013 M−1cm4,
• a highest occupied molecular orbital (HOMO) energy level of the sensitizer is higher than a HOMO energy level of the emitter,
• the spectral overlap integral is evaluated by Equation 1:
• J
• ⁡
• (
• λ
• )
• =
• ∫
• 0
• ∞
• ε
• ⁡
• (
• λ
• )
• ⁢
• λ
• 4
• ⁢
• F
• D
• (
• λ
• )
• ⁢
• d
• ⁢
• λ
• ,
• wherein, in Equation 1,
• J(λ) is the spectral overlap integral of the emission spectrum of the sensitizer and the absorption spectrum of the emitter,
• ε(λ) is a molar extinction coefficient of the emitter calculated from the absorption spectrum of the emitter,
• λ is a wavelength of the emission spectrum and the absorption spectrum, and
• FD(λ) is a normalized emission spectrum of the sensitizer:
• and
• wherein, in Formula 2,
• ring CY71 and ring CY72 are each independently a π electron-rich C3-C60 cyclic group or a pyridine group,
• X71 is a single bond or a linking group comprising O, S, N, B, C, Si, or any combination thereof, and
• * indicates a binding site to any atom included in the remaining portion other than the group represented by Formula 2 in the second compound.