Electroluminescent device having anti-reflective member
View Patent ↗A light emitting device having an anti-reflective member. The light emitting device includes an anti-reflective member including a reflective layer and a first electrode; a second electrode; and a light emitting layer disposed between the first electrode and the second electrode. The first electrode of the present invention has both electrode and anti-reflective functions. Ambient light is reflected by the first electrode to obtain a first reflected light and reflected by the reflective layer to obtain a second reflected light. The first reflected light and the second reflected light have phase difference; thus, the reflection of ambient light is reduced.
1. A light emitting device, comprising:
an anti-reflective member including a first electrode that serves an electrode and reflects portion of ambient light in a first phase, a reflective layer that reflects ambient light in a second phase different from the first phase, and a transparent conductive layer disposed between the reflective layer and the first electrode, wherein material and thickness of the first electrode, the reflective layer and the transparent conductive layer have a property such that the reflected light in the first and second phases interfere with each other to reduce overall intensity of reflected ambient light;
a second electrode; and
a light emitting layer disposed between the first electrode and the second electrode.
2. The light emitting device as claimed in claim 1 , wherein the reflective layer comprises metal.
3. The light emitting device as claimed in claim 1 , wherein the reflective layer has a reflectivity higher than 80%.
4. The light emitting device as claimed in claim 1 , wherein the reflective layer has a thickness of about 400Å to 5000Å.
5. The light-emitting device as claimed in claim 1 wherein the transparent conductive layer has a transmittance higher than 80%.
6. The light-emitting device as claimed in claim 1 wherein the transparent conductive layer has a thickness of about 300Å to 3000Å.
7. The light emitting device as claimed in claim 1 , wherein the first electrode has a thickness of about 50Å to 1000Å.
8. The light emitting device as claimed in claim 1 , wherein the light emitting layer comprises an organic material.
9. The light emitting device as claimed in claim 8 , wherein the first electrode is an anode and the second electrode is a cathode.
10. The light emitting device As claimed in claim 9 , wherein the first electrode has a work function higher than 4.6 eV.
11. The light emitting device as claimed in claim 10 , wherein the first electrode comprises a metal or a conductive ceramic.
12. The light emitting device as claimed in claim 11 , wherein the first electrode comprises Al, Cr, Mo, Pt, Ni, Au, or a combination thereof.
13. The light emitting device as claimed in claim 11 , wherein the first electrode comprises TiN or CrN.
14. The light emitting device as claimed in claim 8 , wherein the first electrode is a cathode and the second electrode is an anode.
15. The light emitting device as claimed in claim 14 , wherein the first electrode has a work function of 2 eV to 3 eV.
16. The light emitting device as claimed in claim 15 , wherein the first electrode comprises a metal.
17. The light emitting device as claimed in claim 16 , wherein the first electrode comprises Ca, Mg, Li, Al, Al/Li alloy or a combination thereof.
18. A light emitting display device, comprising:
a light emitting device as in claim 1 ; and
a controller coupled to the light emitting device to control the light emitting device to render an image in accordance with an input.
19. An electronic device, comprising:
a light emitting display device of claim 18 ; and
an input device coupled to the controller of the light emitting display device to control the light emitting display device to render an image.