HIGH-COLOR-TEMPERATURE TANDEM WHITE OLED

• US 20100066239A1
• Filed: 09/16/2008
• Published: 03/18/2010
• Est. Priority Date: 09/16/2008
• Status: Active Grant

• Current Assignee: Global OLED Technology LLC (LG Display Co., Ltd.)
• Original Assignee: Global OLED Technology LLC (LG Display Co., Ltd.)
• Inventors: Spindler, Jeffrey P., Hatwar, Tukaram K.
• Granted Patent: US 7,977,872 B2
• Time in Patent Office: Days
• US Class Current: 313/504
• CPC Class Codes: H10K 50/125 specially adapted for multicolour light emission, e.g. for emitting white light
• CPC Class Codes: H10K 50/19 Tandem OLEDs
• CPC Class Codes: H10K 85/342 comprising iridium
• CPC Class Codes: H10K 85/622 containing four rings, e.g. pyrene
• CPC Class Codes: H10K 85/631 Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine
• CPC Class Codes: H10K 85/6572 comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole

Abstract

An OLED device having two spaced electrodes including: first, second, and third light-emitting units disposed between the electrodes, the first light-emitting unit produces light that has multiple peaks at wavelengths longer than 500 nm and substantially no emission at wavelengths shorter than 480 nm, and the second and third light-emitting units produce light that has substantial emission at wavelengths shorter than 500 nm; intermediate connectors respectively disposed between the first and second light-emitting units, and between the second and third light-emitting units; and wherein the OLED device emits light with a color temperature greater than 7,000K.

Claims

1. An OLED device having two spaced electrodes comprising:

a. first, second, and third light-emitting units disposed between the electrodes, the first light-emitting unit produces light that has multiple peaks at wavelengths longer than 500 nm and substantially no emission at wavelengths shorter than 480 nm, and the second and third light-emitting units produce light that has substantial emission at wavelengths shorter than 500 nm;

b. intermediate connectors respectively disposed between the first and second light-emitting units, and between the second and third light-emitting units; and

c. wherein the OLED device emits light with a color temperature greater than 7,000K.

2. The OLED device of claim 1 wherein the device emits light with a color temperature between 9,000K and 13,000K.

3. The OLED device of claim 1 wherein the second and third light-emitting units each include a light-emitting layer comprising a host material and a blue-light-emitting dopant.

4. The OLED device of claim 3 wherein the blue light-emitting dopant is a singlet light-emitting compound.

5. The OLED device of claim 3 wherein the blue light-emitting dopant is a triplet light-emitting compound.

6. The OLED device of claim 1 wherein the first light-emitting unit includes a singlet light-emitting compound.

7. The OLED device of claim 1 wherein the first light-emitting unit includes a triplet light-emitting compound.

8. The OLED device of claim 1 wherein the second and third light-emitting units have the same emission spectra.

9. The OLED device of claim 1 wherein the second and third light-emitting units have different emission spectra.

10. The OLED device of claim 1 wherein one of the spaced electrodes is reflective and the other is transmissive and the first light-emitting unit is disposed closer to the reflective electrode than the second and third light-emitting units.

11. The OLED device of claim 1 further including an array of at least three different color filters associated with the device that receives light from the light-emitting units, the bandpass of each of the color filters being selected to produce different colored light.

12. The OLED device of claim 1 wherein the array of at least three different color filters forms an RGBW device.