Electroluminescent device and method for preparing the same

An electroluminescent device, comprising:

• a substrate;
• an electrode;
• an organic layer including at least a light-emitting layer;
• a metal nano pattern which enables emission of polarized light, is shaped as stripes, and functions as an opposite electrode;
• and
• a soft substrate, wherein a plurality of protrusions and recesses are provided on one surface of the soft substrate, wherein the metal nano pattern is formed on the protrusions and recesses, and wherein a grating period of the metal nano pattern satisfies the relation of Formula 1 below:
• D
• <
• λ
• n
• o
• +
• n
• i
• ⁢
• sin
• ⁢
• ⁢
• θ
• i
• Formula
• ⁢
• ⁢
• 1
• wherein
• D is a grating period of the metal nano pattern;
• λ is a wavelength of light emitted from the organic layer;
• ni is a refraction index of an incident medium of the light emitted from the organic layer;
• no is a refraction index of a transmitted medium of the light emitted from the organic layer;
• and
• θi is an angle of incidence of the light emitted from the organic layer which is incident on the metal nano pattern;
• wherein the metal nano pattern is discontinuously formed on the plurality of protrusions and recesses provided on said one surface of the soft substrate.