Organic light-emitting diode and light source device including same
An organic light-emitting diode in accordance with the present invention includes: a reflective electrode; an organic layer formed on the reflective electrode; a transparent electrode formed on the organic layer; a transparent resin layer formed on the transparent electrode; and an encapsulation glass formed on the transparent resin layer. The organic layer includes a light-emitting point. Cone- or pyramid-shaped transparent resin structures are provided in the transparent resin layer in such a manner that each of the cone- or pyramid-shaped transparent resin structures splays from the transparent resin layer toward the encapsulation glass in a normal direction of the encapsulation glass. A refractive index of the transparent resin layer is 1.3 times or more to 1.6 times or less as high as that of the cone- or pyramid-shaped transparent resin structures.
1. An organic light-emitting diode, comprising:
a reflective electrode;
an organic layer formed on the reflective electrode, the organic layer including a light-emitting point;
a transparent electrode formed on the organic layer;
a transparent resin layer formed on the transparent electrode, the transparent resin layer including cone- or pyramid-shaped transparent resin structures; and
an encapsulation glass formed on the transparent resin layer,
wherein: each of the cone- or pyramid-shaped transparent resin structures splays from the transparent resin layer toward the encapsulation glass in a normal direction of the encapsulation glass; and
a refractive index of the transparent resin layer is 1.3 times or more to 1.6 times or less as high as a refractive index of the cone- or pyramid-shaped transparent resin structures.
2. The organic light-emitting diode according to claim 1 , wherein:
the refractive index of the transparent resin layer is not less than 2.15 and not more than 2.25; and
an apex angle (unit: degree) of a cross section including a normal line of the encapsulation glass of each of the cone- or pyramid-shaped transparent resin structures is “2(44.3x−18±5)”, where “x” represents a ratio between the refractive index of the transparent resin layer and the refractive index of the cone- or pyramid-shaped transparent resin structures.
3. The organic light-emitting diode according to claim 2 , wherein:
the light-emitting point emits light at an emission peak wavelength of λ (unit: nm); and
the following relationship is satisfied:
“(2 m− 155/180)λ/4 /n /(cos 30°)≦ ad ≦(2 m− 155/180)λ/4 /n /(cos 46°)”,
where “ad” represents a height from an interface between the reflective electrode and the organic layer to the light-emitting point (“d” (unit: nm) represents a thickness of the organic layer, and “a” represents a value more than 0 but less than 1 (0<a<1)); “n” represents a refractive index of the organic layer; and “m” represents an integer equal to 1 or greater.
4. The organic light-emitting diode according to claim 1 , wherein:
the refractive index of the transparent resin layer is not less than 2.05 and not more than 2.15; and
an apex angle (unit: degree) of a cross section including a normal line of the encapsulation glass of each of the cone- or pyramid-shaped transparent resin structures is “2(44.3x−17.8±5)”, where “x” represents a ratio between the refractive index of the transparent resin layer and the refractive index of the cone- or pyramid-shaped transparent resin structures.
5. The organic light-emitting diode according to claim 4 , wherein:
the light-emitting point emits light at an emission peak wavelength of λ (unit: nm); and
the following relationship is satisfied:
“(2 m− 155/180)λ/4 /n /(cos 30°)≦ ad ≦(2 m− 155/180)λ/4 /n /(cos 43°)”,
where “ad” represents a height from an interface between the reflective electrode and the organic layer to the light-emitting point (“d” (unit: nm) represents a thickness of the organic layer, and “a” represents a value more than 0 but less than 1 (0<a<1)); “n” represents a refractive index of the organic layer; and “m” represents an integer equal to 1 or greater.
6. The organic light-emitting diode according to claim 1 , wherein:
the refractive index of the transparent resin layer is not less than 1.95 and not more than 2.05; and
an apex angle (unit: degree) of a cross section including a normal line of the encapsulation glass of each of the cone- or pyramid-shaped transparent resin structures is “2(39.5x−10.3±5)”, where “x” represents a ratio between the refractive index of the transparent resin layer and the refractive index of the cone- or pyramid-shaped transparent resin structures.
7. The organic light-emitting diode according to claim 6 , wherein:
the light-emitting point emits light at an emission peak wavelength of λ (unit: nm); and
the following relationship is satisfied:
“(2 m− 155/180)λ/4 /n /(cos 30°)≦ ad ≦(2 m− 155/180)λ/4 /n /(cos 45°)”,
where “ad” represents a height from an interface between the reflective electrode and the organic layer to the light-emitting point (“d” (unit: nm) represents a thickness of the organic layer, and “a” represents a value more than 0 but less than 1 (0<a<1)); “n” represents a refractive index of the organic layer; and “m” represents an integer equal to 1 or greater.
8. The organic light-emitting diode according to claim 1 , wherein:
the refractive index of the transparent resin layer is not less than 1.85 and not more than 1.95; and
an apex angle (unit: degree) of a cross section including a normal line of the encapsulation glass of each of the cone- or pyramid-shaped transparent resin structures is “2(37.5x−5.7±5)”, where “x” represents a ratio between the refractive index of the transparent resin layer and the refractive index of the cone- or pyramid-shaped transparent resin structures.
9. The organic light-emitting diode according to claim 8 , wherein:
the light-emitting point emits light at an emission peak wavelength of λ (unit: nm); and
the following relationship is satisfied:
“(2 m− 155/180)λ/4 /n /(cos 28°)≦ ad ≦(2 m− 155/180)λ/4 /n /(cos 43°)”,
where “ad” represents a height from an interface between the reflective electrode and the organic layer to the light-emitting point (“d” (unit: nm) represents a thickness of the organic layer, and “a” represents a value more than 0 but less than 1 (0<a<1)); “n” represents a refractive index of the organic layer; and “m” represents an integer equal to 1 or greater.
10. The organic light-emitting diode according to claim 1 , wherein:
the refractive index of the transparent resin layer is not less than 1.75 and not more than 1.85; and
an apex angle (unit: degree) of a cross section including a normal line of the encapsulation glass of each of the cone- or pyramid-shaped transparent resin structures is “2(45.1x−12±5)”, where “x” represents a ratio between the refractive index of the transparent resin layer and the refractive index of the cone- or pyramid-shaped transparent resin structures.
11. The organic light-emitting diode according to claim 10 , wherein:
the light-emitting point emits light at an emission peak wavelength of λ (unit: nm); and
the following relationship is satisfied:
“(2 m− 155/180)λ/4 /n /(cos 28°)≦ ad ≦(2 m− 155/180)λ/4 /n /(cos 44°)”,
where “ad” represents a height from an interface between the reflective electrode and the organic layer to the light-emitting point (“d” (unit: nm) represents a thickness of the organic layer, and “a” represents a value more than 0 but less than 1 (0<a<1)); “n” represents a refractive index of the organic layer; and “m” represents an integer equal to 1 or greater.
12. The organic light-emitting diode according to claim 1 , wherein:
the refractive index of the transparent resin layer is not less than 1.65 and not more than 1.75; and
an apex angle (unit: degree) of a cross section including a normal line of the encapsulation glass of each of the cone- or pyramid-shaped transparent resin structures is “2(48.9x−13.5±5)”, where “x” represents a ratio between the refractive index of the transparent resin layer and the refractive index of the cone- or pyramid-shaped transparent resin structures.
13. The organic light-emitting diode according to claim 12 , wherein:
the light-emitting point emits light at an emission peak wavelength of λ (unit: nm); and
the following relationship is satisfied:
“(2 m− 155/180)λ/4 /n /(cos 26°)≦ ad ≦(2 m− 155/180)λ/4 /n /(cos 44°)”,
where “ad” represents a height from an interface between the reflective electrode and the organic layer to the light-emitting point (“d” (unit: nm) represents a thickness of the organic layer, and “a” represents a value more than 0 but less than 1 (0<a<1)); “n” represents a refractive index of the organic layer; and “m” represents an integer equal to 1 or greater.
14. The organic light-emitting diode according to claim 1 , wherein:
the refractive index of the transparent resin layer is not less than 1.55 and not more than 1.65; and
an apex angle (unit: degree) of a cross section including a normal line of the encapsulation glass of each of the cone- or pyramid-shaped transparent resin structures is “2(58x−20.7±5)”, where “x” represents a ratio between the refractive index of the transparent resin layer and the refractive index of the cone- or pyramid-shaped transparent resin structures.
15. The organic light-emitting diode according to claim 14 , wherein:
the light-emitting point emits light at an emission peak wavelength of λ (unit: nm); and
the following relationship is satisfied:
“(2 m− 155/180)λ/4 /n /(cos 24°)≦ ad ≦(2 m− 155/180)λ/4 /n /(cos 43°)”,
where “ad” represents a height from an interface between the reflective electrode and the organic layer to the light-emitting point (“d” (unit: nm) represents a thickness of the organic layer, and “a” represents a value more than 0 but less than 1 (0<a<1)); “n” represents a refractive index of the organic layer; and “m” represents an integer equal to 1 or greater.
16. The organic light-emitting diode according to claim 1 , wherein the cone- or pyramid-shaped transparent resin structures are pyramid-shaped.
17. The organic light-emitting diode according to claim 1 , wherein the cone- or pyramid-shaped transparent resin structures are cone-shaped.
18. The organic light-emitting diode according to claim 1 , wherein the cone- or pyramid-shaped transparent resin structures are six-sided pyramid-shaped.
19. The organic light-emitting diode according to claim 1 , wherein bases of the cone- or pyramid-shaped structures are closely packed on an interface between the encapsulation glass and the transparent resin layer.
20. A light source device including the organic light-emitting diode according to claim 1 .