Organic light emitting diode display
An organic light emitting display includes: a substrate; a first electrode on the substrate; an organic light emitting layer on the first electrode; a second electrode formed on the organic light emitting layer; a non-resonance reflection inducing layer on the second electrode; and a capping layer on the non-resonance reflection inducing layer.
1. An organic light emitting display comprising:
a substrate;
a first electrode on the substrate comprising a reflective layer;
an organic light emitting layer on the first electrode;
a second electrode on the organic light emitting layer;
a non-resonance reflection inducing layer on the second electrode; and
a capping layer on the non-resonance reflection inducing layer,
wherein a lower surface of the capping layer and an upper surface of the reflective layer facing the capping layer are configured with the non-resonance reflection inducing layer to subject light to non-resonance reflection between the lower surface of the capping layer and the upper surface of the reflective layer.
2. The organic light emitting display of claim 1 , wherein the non-resonance reflection inducing layer has a refractive index of 1.1 to 1.5.
3. The organic light emitting display of claim 1 , wherein the non-resonance reflection inducing layer has a thickness of 5 nm to 10 nm.
4. The organic light emitting display of claim 1 , wherein the non-resonance reflection inducing layer comprises at least one selected from the group consisting of CaF 2 , NaF, Na 3 AlF 6 , SiOx, AlF 3 , LiF, MgF 2 , Alq 3 [Tris(8-hydroxyquinolinato)aluminum], an acrylic resin, a polyimide-based resin and a polyamide-based resin.
5. The organic light emitting display of claim 1 , wherein a difference in refractive index between the non-resonance reflection inducing layer and the capping layer is 0.3 or more.
6. The organic light emitting display of claim 1 , wherein the capping layer has a refractive index of 1.6 to 3.0.
7. The organic light emitting display of claim 1 , wherein the capping layer has a thickness of 20 nm to 200 nm.
8. The organic light emitting display of claim 1 , wherein the capping layer comprises at least one selected from the group consisting of tris-8-hydroxyquinoline aluminum (Alq3), ZnSe, 2,5-bis(6′-(2′,2″-bipyridyl))-1,1-dimethyl-3,4-diphenylsilole, 4′-bis[N-(1-napthyl)-N-phenyl-amion] biphenyl (α-NPD), N,N′-diphenyl-N,N′-bis(3-methylphenyl)-1,1′-biphenyl-4,4′-diamine (TPD), and 1,1′-bis(di-4-tolylaminophenyl) cyclohexane (TAPC).
9. The organic light emitting display of claim 1 , wherein the first electrode comprises the reflective layer and at least one transparent conductive layer on the reflective layer.
10. The organic light emitting display of claim 9 , wherein the reflective layer comprises at least one of magnesium (Mg), silver (Ag), gold (Au), calcium (Ca), lithium (Li), chromium (Cr), copper (Cu) and aluminum (Al).
11. The organic light emitting display of claim 9 , wherein the transparent conductive layer comprises at least one of indium tin oxides (ITO), indium zinc oxides (IZO), zinc oxides (ZnO), aluminum zinc oxides (AZO), and indium oxides (In 2 O 3 ).
12. The organic light emitting display of claim 9 , satisfying Formulas 1 and 2:
t 1=( n 1×λ1)/2 Formula 1
t 2=( n 2×λ1)/2, Formula 2
wherein a wavelength of light emitted from the organic light emitting layer is λ1,
a distance between the upper surface of the reflective layer and a lower surface of the second electrode is t1,
a distance between the upper surface of the reflective layer and an upper surface of the capping layer is t2, and
n1 and n2 are natural numbers.
13. The organic light emitting display of claim 9 , satisfying Formula 3:
( m 1×λ1)/2< t 3<[( m 1+1)×λ1]/2, Formula 3
wherein a wavelength of light emitted from the organic light emitting layer is λ1,
a distance between the upper surface of the reflective layer and the lower surface of the capping layer is t3, and
m1 is a natural number.
14. The organic light emitting display of claim 1 , further comprising at least one of a hole injection layer and a hole transport layer between the first electrode and the organic light emitting layer.
15. The organic light emitting display of claim 1 , further comprising at least one of an electron transport layer and an electron injection layer between the organic light emitting layer and the second electrode.
16. The organic light emitting display of claim 1 , further comprising a light extraction inducing layer on the capping layer.
17. The organic light emitting display of claim 1 , further comprising a thin film encapsulation layer on the capping layer.
18. The organic light emitting display of claim 17 , wherein the thin film encapsulation layer has a structure where a plurality of inorganic layers and a plurality of organic layers are alternately laminated.