Patent ID: 11903232
Assignee: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 0:
1. A light-emitting device comprising:
a first electrode;
a first light-emitting unit over the first electrode, the first light-emitting unit comprising a first light-emitting layer;
an intermediate layer over the first light-emitting unit, the intermediate layer comprising a charge-generation layer;
a second light-emitting unit over the intermediate layer, the second light-emitting unit comprising a second light-emitting layer; and
a second electrode over the second light-emitting unit,
wherein an emission spectrum of the light-emitting device has a maximal wavelength EL1,
wherein each emission spectrum of the first light-emitting layer and the second light-emitting layer includes a light at the maximal wavelength EL1,
wherein a first distance D1 between the first light-emitting layer and the second light-emitting layer satisfies Formula (i):

(6.3×10−3)×EL1≤D1≤(81.3×10−3)×EL1  (i),

wherein the first distance further satisfies being longer than or equal to 5 nm and shorter than or equal to 40 nm,
wherein a second distance D2 between the first electrode and the second electrode is greater than or equal to, 0.3
  1.8
 

 times and less than or equal to, 0.6
  1.8
 

 times me maximal wavelength EL1, and
wherein the maximal wavelength EL1 is a range from 760 nm to 900 nm.