Patent ID: 11895866
Assignee: SONY GROUP CORPORATION
Field: Audio-visual technology (Electrical engineering)
Classification: CPC C  H  G | IPC H

Claim 6:
7. The light emitting element according to claim 6, wherein
where an optical distance from a maximum light emission position of a first luminescent layer of the plurality of luminescent layers to a second luminescent layer of the plurality of luminescent layers is denoted by OL1, an optical distance from the maximum light emission position of the first luminescent layer to the interface is denoted by OL2, and m1 and m2 are integers, the following formulas (1-1) and (1-2) are satisfied.

0.7{−ϕ1/(2π)+m1}≤2×OL1/λ≤1.2{−ϕ1/(2π)+m1}  (1-1)

0.7{−ϕ2/(2π)+m2}≤2×OL2/λ≤1.2{−ϕ2/(2π)+m2}  (1-2)

Here,
λ: maximum peak wavelength of a spectrum of light generated in the first luminescent layer (or desired wavelength in the light generated in the first luminescent layer);
ϕ1: phase shift amount (unit: radian) of reflected light generated at the light reflecting layer. However, −2π<ϕ1≤0; and
ϕ2: phase shift amount (unit: radian) of reflected light generated at the interface. However, −2π<ϕ2≤0.