Electroluminescent device and method for preparing the same
View Patent ↗An electroluminescent device comprises a substrate, a first electrode, a second electrode, and an organic layer disposed between the first electrode and the second electrode, and including at least a light-emitting layer. A metal nano pattern which enables emission of polarized light is provided on one surface of at least one of the first electrode and the second electrode, wherein a grating period of the metal nano pattern satisfies the relation of Formula 1 below. A method of preparing the electroluminescent device comprises providing a substrate, first and second electrodes, and an organic layer including a light-emitting layer, with a metal nano pattern being provided on at least one of the first and second electrodes. Formula 1 is described in more detail in the description of the invention. The electroluminescent device can achieve emission of polarized light, without reforming materials used in forming the organic layer. D < λ n o + n i sin θ i Formula 1
1. 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;
n i is a refraction index of an incident medium of the light emitted from the organic layer;
n o is a refraction index of a transmitted medium of the light emitted from the organic layer; and
θ i 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.
2. The electroluminescent device of claim 1 , wherein a grating interval of the metal nano pattern is less than the grating period of the metal nano pattern.
3. The electroluminescent device of claim 1 , wherein the metal nano pattern is made of at least one material selected from a group consisting of Ag, Cu, Al, Mg, Pt, Pd, Au, Ni, Nd, Ir, Cr, Na, Cs, Ba, Li, Ca, Co, and alloys thereof.