White OLEDs with a color-compensated electroluminescent unit

1. A tandem white OLED comprising:

a) an anode;

b) a cathode;

c) at least one broadband electroluminescent unit disposed between the anode and the cathode, wherein the broadband electroluminescent unit includes at least one light-emitting layer and produces at least one color component having an intensity less than desired, and wherein one of the broadband electroluminescent unit(s) includes at least three light-emitting layers, and wherein each of the light-emitting layers has a different color of emission;

d) at least one color-compensating electroluminescent unit disposed between the anode and the cathode, wherein the color-compensating electroluminescent unit is selected to produce the at least one color component and to increase the color component intensity, and wherein the color-compensating electroluminescent unit includes means for providing electron-hole recombination to produce light; and

e) an intermediate connector disposed between each adjacent electroluminescent unit, wherein the intermediate connector has no direct connection to an external power source.

2. A tandem white OLED comprising:

a) an anode;

b) a cathode;

c) at least one broadband electroluminescent unit disposed between the anode and the cathode, wherein the broadband electroluminescent unit includes at least one light-emitting layer and produces at least one color component having an intensity less than desired, and wherein one of the broadband electroluminescent unit(s) includes at least two light-emitting layers, and wherein each of the light-emitting layers has a different color of emission;

d) at least one color-compensating electroluminescent unit disposed between the anode and the cathode, wherein the color-compensating electroluminescent unit is selected to produce the at least one color component and to increase the color component intensity, and wherein the color-compensating electroluminescent unit includes means for providing electron-hole recombination to produce light; and

e) an intermediate connector disposed between each adjacent electroluminescent unit, wherein the intermediate connector has no direct connection to an external power source.

3. A tandem white OLED comprising:

a) an anode;

b) a cathode;

c) at least one broadband electroluminescent unit disposed between the anode and the cathode, wherein the broadband electroluminescent unit includes at least one light-emitting layer and produces at least one color component having an intensity less than desire;

d) at least one color-compensating electroluminescent unit disposed between the anode and the cathode, wherein the color-compensating electroluminescent unit is selected to produce the at least one color component and to increase the color component intensity, and wherein the color-compensating electroluminescent unit includes means for providing electron-hole recombination to produce light;

e) an intermediate connector disposed between each adjacent electroluminescent unit, wherein the intermediate connector has no direct connection to an external power source; and

f) wherein the color-compensating electroluminescent unit(s) have green color emission, and wherein the broadband electroluminescent unit(s) have a green color component with an intensity less than desired.

4. A tandem white OLED comprising:

a) an anode;

b) a cathode;

c) a first broadband electroluminescent unit disposed between the anode and the cathode, wherein the first broadband electroluminescent unit includes at least one light-emitting layer and produces at least one color component having an intensity less than desired;

d) at least one color-compensating electroluminescent unit disposed between the anode and the cathode, wherein the color-compensating electroluminescent unit is selected to produce the at least one color component and to increase the color component intensity, and wherein the color-compensating electroluminescent unit includes means for providing electron-hole recombination to produce light;

e) an intermediate connector disposed between each adjacent electroluminescent unit, wherein the intermediate connector has no direct connection to an external power source; and

f) a second broadband electroluminescent unit disposed between the anode and the cathode, and wherein the color-compensating electroluminescent unit is disposed between first and second broadband electroluminescent units.

5. A tandem white OLED comprising:

a) an anode;

b) a cathode;

c) at least one broadband electroluminescent unit disposed between the anode and the cathode, wherein the broadband electroluminescent unit includes at least one light-emitting layer and produces at least one color component having an intensity less than desired;

d) at least one color-compensating electroluminescent unit disposed between the anode and the cathode, wherein the color-compensating electroluminescent unit is selected to produce the at least one color component and to increase the color component intensity, and wherein the color-compensating electroluminescent unit includes means providing electron-hole recombination to produce light;

e) an intermediate connector disposed between each adjacent electroluminescent unit, wherein the intermediate connector has no direct connection to an external power source; and

f) wherein the color-compensating electroluminescent unit is disposed between two other color-compensating electroluminescent units.