Stabilized OLED device
View Patent ↗A stabilized OLED device for emitting light of a specific color includes a metallic anode and a metallic cathode spaced from the metallic anode. The device also includes a light-emitting layer including a host and a dopant, the dopant selected to produce light having a spectrum including light of the specific color, and a stabilizer provided in one of the device layers which improves the useful lifetime of the OLED device, wherein the stabilizer has an emission spectrum different from that of the light-emitting layer. One of the electrode layers is semitransparent and the other one is substantially opaque and reflective such that the stabilized OLED device forms a microcavity that emits a narrow band light with the specific color.
1. A stabilized OLED device for emitting light of a specific color, comprising:
a) a metallic anode and a metallic cathode spaced from the metallic anode;
b) a light-emitting layer including a host and a dopant disposed between the anode and the cathode, the dopant selected to produce light having a spectrum containing light of the specific color;
c) a stabilizer provided in one of the device layers which improves the useful lifetime of the OLED device, wherein the stabilizer has an emission spectrum different from that of the light-emitting layer, and
d) wherein one of the electrode layers is semitransparent and the other one is substantially opaque and reflective such that the stabilized OLED device forms a microcavity that emits a narrow band light with the specific color.
2. The OLED device of claim 1 wherein material for the semitransparent electrode layer includes Ag or Au, or alloys thereof.
3. The OLED device of claim 1 wherein the material for the reflective electrode layer includes Ag, Au, Al, Mg, or Ca, or alloys thereof.
4. The OLED device of claim 1 further including a hole-transporting layer disposed between the anode and the cathode.
5. The OLED device of claim 1 wherein the OLED device includes a hole-transporting layer and the stabilizer is provided in the light-emitting layer or the hole-transporting layer or both.
6. The OLED device according to claim 1 further including an electron-transporting layer and a hole-transporting layer and wherein the stabilizer is provided in such electron-transporting layer or in the light-emitting layer or in the hole-transporting layer.
7. The OLED device according to claim 1 wherein the dopant produces blue light.
8. A color-conversion OLED device comprising:
a) a metallic anode and a metallic cathode spaced from the metallic anode;
b) a light-emitting layer including a host and a dopant disposed between the anode and the cathode, the dopant selected to produce blue light;
c) a stabilizer provided in one of the device layers which improves the useful lifetime of the OLED device, wherein the stabilizer has an emission spectrum different from that of te light-emitting layer;
d) wherein one of the electrode layers is semitransparent and the other one is substantially opaque and reflective such that the stabilized OLED device forms a microcavity that emits a narrow blue band light; and
e) a color conversion layer including fluorescent material responsive to the blue light to re-emit a different colored light.
9. A color-conversion OLED device of claim 8 wherein material for the semitransparent electrode layer includes Ag or Au, or alloys thereof.
10. The color-conversion OLED device of claim 8 wherein the material for the reflective electrode layer includes Ag, Au, A 1 , Mg, or Ca, or alloys thereof.