Light-emitting device and electronic apparatus including the same

A light-emitting device, comprising:

• a first electrode;
• a second electrode;
• and
• an interlayer arranged between the first electrode and the second electrode,
• wherein the interlayer comprises an emission layer,
• wherein the emission layer comprises a host, a sensitizer, and an fluorescent emitter,
• the host comprises a first host,
• the sensitizer comprises a transition metal,
• the fluorescent emitter is metal-free,
• DTFE is about 200 microseconds or more,
• the DTFE is a decay time of a delayed fluorescence component from a time-resolved photoluminescence (TRPL) spectrum of a first film,
• the first film is a two-component film comprising the first host and the fluorescent emitter, and
• the light-emitting device satisfies at least one of Condition A or Condition B:
• DFSE+FE is about 20% or less Condition A
• (DFSE+FE/DFFE) is about 0.5 or less, Condition B
• wherein, in Condition A and Condition B,
• DFSE+FE is a proportion of a delayed fluorescence component to total luminescence components of a second film, as evaluated from a TRPL spectrum of the second film,
• the second film is a three-component film comprising the first host, the sensitizer, and the fluorescent emitter, and
• DFFE is a proportion of a delayed fluorescence component to total luminescence components of the first film, as evaluated from a TRPL spectrum of the first film.